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Fix array index out of range bug 

Closes #25
This commit is contained in:
Reda Lemeden 2015-10-22 20:49:31 +02:00
parent ebaf223f71
commit ce384ae22a
3 changed files with 21 additions and 14 deletions
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4
Gifu.xcodeproj/project.pbxproj
View File

@ -12,6 +12,7 @@
004529921BD82209006493BF /* Runes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 004529911BD82209006493BF /* Runes.swift */; };
005656ED1A6F14D6008A0ED1 /* Animator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 005656EC1A6F14D6008A0ED1 /* Animator.swift */; };
005656EF1A6F1C26008A0ED1 /* AnimatableImageView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 005656EE1A6F1C26008A0ED1 /* AnimatableImageView.swift */; };
007E08441BD95E6200883D0C /* ArrayExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 007E08431BD95E6200883D0C /* ArrayExtension.swift */; };
009BD1391BBC7F6500FC982B /* GifuTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 009BD1381BBC7F6500FC982B /* GifuTests.swift */; };
009BD13B1BBC7F6500FC982B /* Gifu.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 00B8C73E1A364DA400C188E7 /* Gifu.framework */; };
009BD1441BBC93C800FC982B /* CGSizeExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 009BD1431BBC93C800FC982B /* CGSizeExtension.swift */; };
@ -38,6 +39,7 @@
004529911BD82209006493BF /* Runes.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = Runes.swift; path = Carthage/Checkouts/Runes/Source/Runes.swift; sourceTree = SOURCE_ROOT; };
005656EC1A6F14D6008A0ED1 /* Animator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Animator.swift; sourceTree = "<group>"; };
005656EE1A6F1C26008A0ED1 /* AnimatableImageView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AnimatableImageView.swift; sourceTree = "<group>"; };
007E08431BD95E6200883D0C /* ArrayExtension.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ArrayExtension.swift; sourceTree = "<group>"; };
009BD1361BBC7F6500FC982B /* GifuTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = GifuTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
009BD1381BBC7F6500FC982B /* GifuTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GifuTests.swift; sourceTree = "<group>"; };
009BD13A1BBC7F6500FC982B /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@ -84,6 +86,7 @@
children = (
009BD1431BBC93C800FC982B /* CGSizeExtension.swift */,
EAF49C7E1A3A4DE000B395DF /* UIImageExtension.swift */,
007E08431BD95E6200883D0C /* ArrayExtension.swift */,
);
name = Extensions;
sourceTree = "<group>";
@ -282,6 +285,7 @@
EAF49CB11A3B6EEB00B395DF /* AnimatedFrame.swift in Sources */,
00B8C75F1A364DCE00C188E7 /* ImageSourceHelpers.swift in Sources */,
EAF49C811A3A4FAA00B395DF /* FunctionalHelpers.swift in Sources */,
007E08441BD95E6200883D0C /* ArrayExtension.swift in Sources */,
EAF49C7F1A3A4DE000B395DF /* UIImageExtension.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;

26
Source/Animator.swift
View File

@ -91,21 +91,19 @@ class Animator {
/// - returns: An optional image at a given frame.
func updateCurrentFrame(duration: CFTimeInterval) -> Bool {
timeSinceLastFrameChange += min(maxTimeStep, duration)
let frameDuration = animatedFrames[currentFrameIndex].duration
guard let frameDuration = animatedFrames[safe:currentFrameIndex]?.duration where
frameDuration <= timeSinceLastFrameChange else { return false }
if timeSinceLastFrameChange >= frameDuration {
timeSinceLastFrameChange -= frameDuration
let lastFrameIndex = currentFrameIndex
currentFrameIndex = ++currentFrameIndex % animatedFrames.count
// Loads the next needed frame for progressive loading
if animatedFrames.count < frameCount {
animatedFrames[lastFrameIndex] = prepareFrame(currentPreloadIndex)
currentPreloadIndex = ++currentPreloadIndex % frameCount
}
return true
timeSinceLastFrameChange -= frameDuration
let lastFrameIndex = currentFrameIndex
currentFrameIndex = ++currentFrameIndex % animatedFrames.count
// Loads the next needed frame for progressive loading
if animatedFrames.count < frameCount {
animatedFrames[lastFrameIndex] = prepareFrame(currentPreloadIndex)
currentPreloadIndex = ++currentPreloadIndex % frameCount
}
return false
return true
}
}

5
Source/ArrayExtension.swift Normal file
View File

@ -0,0 +1,5 @@
extension Array {
subscript(safe index: Int) -> Element? {
return indices ~= index ? self[index] : .None
}
}