Gifu/Source/UIImageExtension.swift

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Swift
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/// A `UIImage` extension that makes it easier to resize the image and inspect its size.
extension UIImage {
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/// Resizes an image instance.
///
/// - parameter size: The new size of the image.
/// - returns: A new resized image instance.
func resize(size: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
self.drawInRect(CGRect(origin: CGPointZero, 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 resizeAspectFit(size: CGSize) -> UIImage {
let newSize = self.size.sizeConstrainedBySize(size)
return resize(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 resizeAspectFill(size: CGSize) -> UIImage {
let newSize = self.size.sizeFillingSize(size)
return resize(newSize)
}
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/// 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 imageWithData(data: NSData, size: CGSize) -> UIImage? {
return UIImage(data: data)?.resize(size)
}
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/// 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 sizeForImageData(data: NSData) -> CGSize? {
return UIImage(data: data)?.size
}
}