Here's the code I wrote to resize an image after cropping. I find that I rebuild a CGImageRef
to resize the cropped image. I guess there must be a way to optimize it. So how?
let imgRef: CGImageRef = CGImageCreateWithImageInRect(img.CGImage, rect)!
let croppedImg = UIImage(CGImage: imgRef, scale: 1, orientation: .Up)
let imgSize = CGSize(width: Conf.Size.avatarSize.width, height: Conf.Size.avatarSize.width)
UIGraphicsBeginImageContextWithOptions(imgSize, false, 1.0)
croppedImg.drawInRect(CGRect(origin: CGPointZero, size: imgSize))
let savingImgContext = UIGraphicsGetCurrentContext()
UIGraphicsEndImageContext()
if let savingImgRef: CGImageRef = CGBitmapContextCreateImage(savingImgContext) {
let savingImg = UIImage(CGImage: savingImgRef, scale: 1, orientation: .Up)
UIImageWriteToSavedPhotosAlbum(savingImg, nil, nil, nil)
}
Here's a function I use to resize images. Hopefully it is what you are looking for.
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 orientation
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)
}
let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
image.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.