Start sheet

.gitignore

@@ -0,0 +1,78 @@
+.DS_Store
+MyPlayground.playground/
+
+### Swift ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+.build/
+
+# CocoaPods - Refactored to standalone file
+
+# Carthage - Refactored to standalone file
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+
+### Xcode ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+
+## Various settings
+
+## Other
+
+### Xcode Patch ###
+*.xcodeproj/*
+!*.xcodeproj/project.pbxproj
+!*.xcodeproj/xcshareddata/
+!*.xcworkspace/contents.xcworkspacedata
+/*.gcno

SheetImagePicker.xcodeproj/project.pbxproj

@@ -8,12 +8,56 @@
 
 /* Begin PBXBuildFile section */
 		D610D2D6233945AF009EB06A /* SheetImagePicker.h in Headers */ = {isa = PBXBuildFile; fileRef = D610D2D4233945AF009EB06A /* SheetImagePicker.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		D610D2E3233945B9009EB06A /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = D610D2E2233945B9009EB06A /* AppDelegate.swift */; };
+		D610D2E5233945B9009EB06A /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = D610D2E4233945B9009EB06A /* SceneDelegate.swift */; };
+		D610D2E7233945B9009EB06A /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D610D2E6233945B9009EB06A /* ViewController.swift */; };
+		D610D2EA233945B9009EB06A /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = D610D2E8233945B9009EB06A /* Main.storyboard */; };
+		D610D2EC233945BB009EB06A /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = D610D2EB233945BB009EB06A /* Assets.xcassets */; };
+		D610D2EF233945BB009EB06A /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = D610D2ED233945BB009EB06A /* LaunchScreen.storyboard */; };
+		D610D2F5233945C0009EB06A /* SheetImagePicker.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D610D2D1233945AF009EB06A /* SheetImagePicker.framework */; };
+		D610D2F6233945C0009EB06A /* SheetImagePicker.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = D610D2D1233945AF009EB06A /* SheetImagePicker.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
+		D610D2FD23394E00009EB06A /* SheetContainerViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D610D2FC23394E00009EB06A /* SheetContainerViewController.swift */; };
+		D610D2FF23395975009EB06A /* Detent.swift in Sources */ = {isa = PBXBuildFile; fileRef = D610D2FE23395975009EB06A /* Detent.swift */; };
 /* End PBXBuildFile section */
 
+/* Begin PBXContainerItemProxy section */
+		D610D2F7233945C0009EB06A /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = D610D2C8233945AF009EB06A /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = D610D2D0233945AF009EB06A;
+			remoteInfo = SheetImagePicker;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		D610D2F9233945C0009EB06A /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+				D610D2F6233945C0009EB06A /* SheetImagePicker.framework in Embed Frameworks */,
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
 /* Begin PBXFileReference section */
 		D610D2D1233945AF009EB06A /* SheetImagePicker.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SheetImagePicker.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		D610D2D4233945AF009EB06A /* SheetImagePicker.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SheetImagePicker.h; sourceTree = "<group>"; };
 		D610D2D5233945AF009EB06A /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		D610D2E0233945B9009EB06A /* SheetImagePickerTest.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = SheetImagePickerTest.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		D610D2E2233945B9009EB06A /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		D610D2E4233945B9009EB06A /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
+		D610D2E6233945B9009EB06A /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
+		D610D2E9233945B9009EB06A /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		D610D2EB233945BB009EB06A /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		D610D2EE233945BB009EB06A /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		D610D2F0233945BB009EB06A /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		D610D2FC23394E00009EB06A /* SheetContainerViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SheetContainerViewController.swift; sourceTree = "<group>"; };
+		D610D2FE23395975009EB06A /* Detent.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Detent.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -24,6 +68,14 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		D610D2DD233945B9009EB06A /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				D610D2F5233945C0009EB06A /* SheetImagePicker.framework in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -31,7 +83,9 @@
 			isa = PBXGroup;
 			children = (
 				D610D2D3233945AF009EB06A /* SheetImagePicker */,
+				D610D2E1233945B9009EB06A /* SheetImagePickerTest */,
 				D610D2D2233945AF009EB06A /* Products */,
+				D610D2F4233945C0009EB06A /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -39,6 +93,7 @@
 			isa = PBXGroup;
 			children = (
 				D610D2D1233945AF009EB06A /* SheetImagePicker.framework */,
+				D610D2E0233945B9009EB06A /* SheetImagePickerTest.app */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -47,11 +102,34 @@
 			isa = PBXGroup;
 			children = (
 				D610D2D4233945AF009EB06A /* SheetImagePicker.h */,
+				D610D2FC23394E00009EB06A /* SheetContainerViewController.swift */,
+				D610D2FE23395975009EB06A /* Detent.swift */,
 				D610D2D5233945AF009EB06A /* Info.plist */,
 			);
 			path = SheetImagePicker;
 			sourceTree = "<group>";
 		};
+		D610D2E1233945B9009EB06A /* SheetImagePickerTest */ = {
+			isa = PBXGroup;
+			children = (
+				D610D2E2233945B9009EB06A /* AppDelegate.swift */,
+				D610D2E4233945B9009EB06A /* SceneDelegate.swift */,
+				D610D2E6233945B9009EB06A /* ViewController.swift */,
+				D610D2E8233945B9009EB06A /* Main.storyboard */,
+				D610D2EB233945BB009EB06A /* Assets.xcassets */,
+				D610D2ED233945BB009EB06A /* LaunchScreen.storyboard */,
+				D610D2F0233945BB009EB06A /* Info.plist */,
+			);
+			path = SheetImagePickerTest;
+			sourceTree = "<group>";
+		};
+		D610D2F4233945C0009EB06A /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXHeadersBuildPhase section */
@@ -84,17 +162,41 @@
 			productReference = D610D2D1233945AF009EB06A /* SheetImagePicker.framework */;
 			productType = "com.apple.product-type.framework";
 		};
+		D610D2DF233945B9009EB06A /* SheetImagePickerTest */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = D610D2F1233945BB009EB06A /* Build configuration list for PBXNativeTarget "SheetImagePickerTest" */;
+			buildPhases = (
+				D610D2DC233945B9009EB06A /* Sources */,
+				D610D2DD233945B9009EB06A /* Frameworks */,
+				D610D2DE233945B9009EB06A /* Resources */,
+				D610D2F9233945C0009EB06A /* Embed Frameworks */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				D610D2F8233945C0009EB06A /* PBXTargetDependency */,
+			);
+			name = SheetImagePickerTest;
+			productName = SheetImagePickerTest;
+			productReference = D610D2E0233945B9009EB06A /* SheetImagePickerTest.app */;
+			productType = "com.apple.product-type.application";
+		};
 /* End PBXNativeTarget section */
 
 /* Begin PBXProject section */
 		D610D2C8233945AF009EB06A /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
+				LastSwiftUpdateCheck = 1100;
 				LastUpgradeCheck = 1100;
 				ORGANIZATIONNAME = Shadowfacts;
 				TargetAttributes = {
 					D610D2D0233945AF009EB06A = {
 						CreatedOnToolsVersion = 11.0;
+						LastSwiftMigration = 1100;
+					};
+					D610D2DF233945B9009EB06A = {
+						CreatedOnToolsVersion = 11.0;
 					};
 				};
 			};
@@ -112,6 +214,7 @@
 			projectRoot = "";
 			targets = (
 				D610D2D0233945AF009EB06A /* SheetImagePicker */,
+				D610D2DF233945B9009EB06A /* SheetImagePickerTest */,
 			);
 		};
 /* End PBXProject section */
@@ -124,6 +227,16 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		D610D2DE233945B9009EB06A /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				D610D2EF233945BB009EB06A /* LaunchScreen.storyboard in Resources */,
+				D610D2EC233945BB009EB06A /* Assets.xcassets in Resources */,
+				D610D2EA233945B9009EB06A /* Main.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
@@ -131,11 +244,50 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				D610D2FD23394E00009EB06A /* SheetContainerViewController.swift in Sources */,
+				D610D2FF23395975009EB06A /* Detent.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		D610D2DC233945B9009EB06A /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				D610D2E7233945B9009EB06A /* ViewController.swift in Sources */,
+				D610D2E3233945B9009EB06A /* AppDelegate.swift in Sources */,
+				D610D2E5233945B9009EB06A /* SceneDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXSourcesBuildPhase section */
 
+/* Begin PBXTargetDependency section */
+		D610D2F8233945C0009EB06A /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = D610D2D0233945AF009EB06A /* SheetImagePicker */;
+			targetProxy = D610D2F7233945C0009EB06A /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
+/* Begin PBXVariantGroup section */
+		D610D2E8233945B9009EB06A /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				D610D2E9233945B9009EB06A /* Base */,
+			);
+			name = Main.storyboard;
+			sourceTree = "<group>";
+		};
+		D610D2ED233945BB009EB06A /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				D610D2EE233945BB009EB06A /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
 /* Begin XCBuildConfiguration section */
 		D610D2D7233945AF009EB06A /* Debug */ = {
 			isa = XCBuildConfiguration;
@@ -260,6 +412,33 @@
 		D610D2DA233945AF009EB06A /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_STYLE = Automatic;
+				DEFINES_MODULE = YES;
+				DEVELOPMENT_TEAM = HGYVAQA9FW;
+				DYLIB_COMPATIBILITY_VERSION = 1;
+				DYLIB_CURRENT_VERSION = 1;
+				DYLIB_INSTALL_NAME_BASE = "@rpath";
+				INFOPLIST_FILE = SheetImagePicker/Info.plist;
+				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = net.shadowfacts.SheetImagePicker;
+				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				SKIP_INSTALL = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		D610D2DB233945AF009EB06A /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEFINES_MODULE = YES;
 				DEVELOPMENT_TEAM = HGYVAQA9FW;
@@ -279,27 +458,41 @@
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
-			name = Debug;
+			name = Release;
 		};
-		D610D2DB233945AF009EB06A /* Release */ = {
+		D610D2F2233945BB009EB06A /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_STYLE = Automatic;
-				DEFINES_MODULE = YES;
 				DEVELOPMENT_TEAM = HGYVAQA9FW;
-				DYLIB_COMPATIBILITY_VERSION = 1;
+				INFOPLIST_FILE = SheetImagePickerTest/Info.plist;
-				DYLIB_CURRENT_VERSION = 1;
-				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = SheetImagePicker/Info.plist;
-				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
-					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = net.shadowfacts.SheetImagePicker;
+				PRODUCT_BUNDLE_IDENTIFIER = net.shadowfacts.SheetImagePickerTest;
-				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				PRODUCT_NAME = "$(TARGET_NAME)";
-				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		D610D2F3233945BB009EB06A /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = HGYVAQA9FW;
+				INFOPLIST_FILE = SheetImagePickerTest/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = net.shadowfacts.SheetImagePickerTest;
+				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -326,6 +519,15 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		D610D2F1233945BB009EB06A /* Build configuration list for PBXNativeTarget "SheetImagePickerTest" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				D610D2F2233945BB009EB06A /* Debug */,
+				D610D2F3233945BB009EB06A /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 	};
 	rootObject = D610D2C8233945AF009EB06A /* Project object */;

SheetImagePicker.xcodeproj/xcuserdata/shadowfacts.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -9,6 +9,11 @@
 			<key>orderHint</key>
 			<integer>0</integer>
 		</dict>
+		<key>SheetImagePickerTest.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>1</integer>
+		</dict>
 	</dict>
 </dict>
 </plist>

SheetImagePicker/Detent.swift

@@ -0,0 +1,31 @@
+//
+//  Detent.swift
+//  SheetImagePicker
+//
+//  Created by Shadowfacts on 9/23/19.
+//  Copyright © 2019 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+public enum Detent {
+    case top
+    case middle
+    case bottom
+    case other(CGFloat)
+}
+
+extension Detent {
+    func offset(in view: UIView) -> CGFloat {
+        switch self {
+        case .top:
+            return max(view.safeAreaInsets.top, 50)
+        case .middle:
+            return view.bounds.midY
+        case .bottom:
+            return view.bounds.height - view.safeAreaInsets.bottom - 100//max(view.safeAreaInsets.bottom, 100)
+        case let .other(value):
+            return value
+        }
+    }
+}

SheetImagePicker/SheetContainerViewController.swift

@@ -0,0 +1,89 @@
+//
+//  SheetContainerViewController.swift
+//  SheetImagePicker
+//
+//  Created by Shadowfacts on 9/23/19.
+//  Copyright © 2019 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+public class SheetContainerViewController: UIViewController {
+
+    let content: UIViewController
+    
+    public var detents: [Detent] = [.bottom, .middle, .top] {
+        didSet {
+            
+        }
+    }
+
+    var topConstraint: NSLayoutConstraint!
+    lazy var initialConstant: CGFloat = view.bounds.height / 2
+    
+    public init(content: UIViewController) {
+        self.content = content
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required public init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override public func viewDidLoad() {
+        super.viewDidLoad()
+        
+        addChild(content)
+        content.didMove(toParent: self)
+        view.addSubview(content.view)
+        topConstraint = content.view.topAnchor.constraint(equalTo: view.topAnchor, constant: initialConstant)
+        NSLayoutConstraint.activate([
+            content.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            content.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            topConstraint,
+            content.view.bottomAnchor.constraint(equalTo: view.bottomAnchor)
+        ])
+        
+        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognized(_:)))
+        content.view.addGestureRecognizer(panGesture)
+    }
+    
+    @objc func panGestureRecognized(_ recognizer: UIPanGestureRecognizer) {
+        switch recognizer.state {
+        case .began:
+            initialConstant = topConstraint.constant
+            
+        case .changed:
+            let translation = recognizer.translation(in: content.view)
+            var realOffset = initialConstant + translation.y
+            if realOffset < view.safeAreaInsets.top {
+                print(realOffset)
+                realOffset = view.safeAreaInsets.top - realOffset / pow(CGFloat(M_E), realOffset / view.safeAreaInsets.top)
+            }
+            topConstraint.constant = realOffset
+            
+        case .ended:
+            if let offset = nearestDetentOffset(offset: topConstraint.constant) {
+                let distance = abs(topConstraint.constant - offset)
+                self.topConstraint.constant = offset
+                let velocity = recognizer.velocity(in: view)
+                let springVelocity = velocity.y / distance
+                UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.6, initialSpringVelocity: springVelocity, animations: {
+                    self.view.layoutIfNeeded()
+                })
+            }
+            
+        default:
+            return
+        }
+    }
+    
+    func nearestDetentOffset(offset: CGFloat) -> CGFloat? {
+        return detents.map { $0.offset(in: view) }.min { (a, b) -> Bool in
+            return abs(offset - a) < abs(offset - b)
+        }
+    }
+    
+}
+

SheetImagePickerTest/AppDelegate.swift

@@ -0,0 +1,37 @@
+//
+//  AppDelegate.swift
+//  SheetImagePickerTest
+//
+//  Created by Shadowfacts on 9/23/19.
+//  Copyright © 2019 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+

SheetImagePickerTest/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

SheetImagePickerTest/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

SheetImagePickerTest/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

SheetImagePickerTest/Base.lproj/Main.storyboard

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

SheetImagePickerTest/Info.plist

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

SheetImagePickerTest/SceneDelegate.swift

@@ -0,0 +1,53 @@
+//
+//  SceneDelegate.swift
+//  SheetImagePickerTest
+//
+//  Created by Shadowfacts on 9/23/19.
+//  Copyright © 2019 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+
+    var window: UIWindow?
+
+
+    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
+        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
+        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
+        guard let _ = (scene as? UIWindowScene) else { return }
+    }
+
+    func sceneDidDisconnect(_ scene: UIScene) {
+        // Called as the scene is being released by the system.
+        // This occurs shortly after the scene enters the background, or when its session is discarded.
+        // Release any resources associated with this scene that can be re-created the next time the scene connects.
+        // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
+    }
+
+    func sceneDidBecomeActive(_ scene: UIScene) {
+        // Called when the scene has moved from an inactive state to an active state.
+        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
+    }
+
+    func sceneWillResignActive(_ scene: UIScene) {
+        // Called when the scene will move from an active state to an inactive state.
+        // This may occur due to temporary interruptions (ex. an incoming phone call).
+    }
+
+    func sceneWillEnterForeground(_ scene: UIScene) {
+        // Called as the scene transitions from the background to the foreground.
+        // Use this method to undo the changes made on entering the background.
+    }
+
+    func sceneDidEnterBackground(_ scene: UIScene) {
+        // Called as the scene transitions from the foreground to the background.
+        // Use this method to save data, release shared resources, and store enough scene-specific state information
+        // to restore the scene back to its current state.
+    }
+
+
+}
+

SheetImagePickerTest/ViewController.swift

@@ -0,0 +1,36 @@
+//
+//  ViewController.swift
+//  SheetImagePickerTest
+//
+//  Created by Shadowfacts on 9/23/19.
+//  Copyright © 2019 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+import SheetImagePicker
+
+class ViewController: UIViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        // Do any additional setup after loading the view.
+        
+        let content = UIViewController()
+        content.view.translatesAutoresizingMaskIntoConstraints = false
+        content.view.backgroundColor = .red
+        let sheet = SheetContainerViewController(content: content)
+        sheet.view.backgroundColor = .blue
+        
+        addChild(sheet)
+        sheet.didMove(toParent: self)
+        view.addSubview(sheet.view)
+        NSLayoutConstraint.activate([
+            sheet.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            sheet.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            sheet.view.topAnchor.constraint(equalTo: view.topAnchor),
+            sheet.view.bottomAnchor.constraint(equalTo: view.bottomAnchor)
+        ])
+    }
+
+}
+