func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage {
let size = image.size
let widthRatio = targetSize.width / image.size.width
let heightRatio = targetSize.height / image.size.height
// Figure out what our orientation is, and use that to form the rectangle
var newSize: CGSize
if(widthRatio > heightRatio) {
newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
} else {
newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
}
// This is the rect that we've calculated out and this is what is actually used below
let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
// Actually do the resizing to the rect using the ImageContext stuff
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
image.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
现在从原始图像中获取调整大小的图像,就像我所做的那样:
let image = UIImage(named: "YOUR IMAGE NAME")
let newHeight = (image?.size.height/image?.size.width) * YOUR_UIIMAGE_VIEW_WIDTH
let newSize = CGSize(width: YOUR_UIIMAGE_VIEW_WIDTH, height: newHeight)
let newResizedImage = resizeImage(image: image, targetSize: newSize)
希望,这会有所帮助。