51 lines
1.8 KiB
Swift
51 lines
1.8 KiB
Swift
/// A `UIImage` extension that makes it easier to resize the image and inspect its size.
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extension UIImage {
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/// Resizes an image instance.
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///
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/// - parameter size: The new size of the image.
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/// - returns: A new resized image instance.
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func resize(size: CGSize) -> UIImage {
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UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
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self.drawInRect(CGRect(origin: CGPointZero, size: size))
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let newImage = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return newImage ?? self
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}
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/// Resizes an image instance to fit inside a constraining size while keeping the aspect ratio.
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///
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/// - parameter size: The constraining size of the image.
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/// - returns: A new resized image instance.
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func resizeAspectFit(size: CGSize) -> UIImage {
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let newSize = self.size.sizeConstrainedBySize(size)
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return resize(newSize)
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}
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/// Resizes an image instance to fill a constraining size while keeping the aspect ratio.
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///
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/// - parameter size: The constraining size of the image.
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/// - returns: A new resized image instance.
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func resizeAspectFill(size: CGSize) -> UIImage {
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let newSize = self.size.sizeFillingSize(size)
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return resize(newSize)
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}
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/// Returns a new `UIImage` instance using raw image data and a size.
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///
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/// - parameter data: Raw image data.
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/// - parameter size: The size to be used to resize the new image instance.
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/// - returns: A new image instance from the passed in data.
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class func imageWithData(data: NSData, size: CGSize) -> UIImage? {
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return UIImage(data: data)?.resize(size)
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}
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/// Returns an image size from raw image data.
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///
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/// - parameter data: Raw image data.
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/// - returns: The size of the image contained in the data.
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class func sizeForImageData(data: NSData) -> CGSize? {
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return UIImage(data: data)?.size
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}
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}
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