Gifu/Source/Extensions/UIImage.swift

51 lines
1.8 KiB
Swift

import UIKit
/// A `UIImage` extension that makes it easier to resize the image and inspect its size.
extension UIImage {
/// Resizes an image instance.
///
/// - parameter size: The new size of the image.
/// - returns: A new resized image instance.
func resized(to size: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
self.draw(in: CGRect(origin: CGPoint.zero, size: size))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage ?? self
}
/// Resizes an image instance to fit inside a constraining size while keeping the aspect ratio.
///
/// - parameter size: The constraining size of the image.
/// - returns: A new resized image instance.
func constrained(by size: CGSize) -> UIImage {
let newSize = size.constrained(by: size)
return resized(to: newSize)
}
/// Resizes an image instance to fill a constraining size while keeping the aspect ratio.
///
/// - parameter size: The constraining size of the image.
/// - returns: A new resized image instance.
func filling(size: CGSize) -> UIImage {
let newSize = size.filling(size)
return resized(to: newSize)
}
/// Returns a new `UIImage` instance using raw image data and a size.
///
/// - parameter data: Raw image data.
/// - parameter size: The size to be used to resize the new image instance.
/// - returns: A new image instance from the passed in data.
class func image(with data: Data, size: CGSize) -> UIImage? {
return UIImage(data: data)?.resized(to: size)
}
/// Returns an image size from raw image data.
///
/// - parameter data: Raw image data.
/// - returns: The size of the image contained in the data.
class func size(withImageData data: Data) -> CGSize? {
return UIImage(data: data)?.size
}
}