你可以先使用這些擴展由%甚至寬度
extension UIImage {
func resizeWithPercent(percentage: CGFloat) -> UIImage? {
let imageView = UIImageView(frame: CGRect(origin: .zero, size: CGSize(width: size.width * percentage, height: size.height * percentage)))
imageView.contentMode = .ScaleAspectFit
imageView.image = self
UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
guard let context = UIGraphicsGetCurrentContext() else { return nil }
imageView.layer.renderInContext(context)
guard let result = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
UIGraphicsEndImageContext()
return result
}
func resizeWithWidth(width: CGFloat) -> UIImage? {
let imageView = UIImageView(frame: CGRect(origin: .zero, size: CGSize(width: width, height: CGFloat(ceil(width/size.width * size.height)))))
imageView.contentMode = .ScaleAspectFit
imageView.image = self
UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
guard let context = UIGraphicsGetCurrentContext() else { return nil }
imageView.layer.renderInContext(context)
guard let result = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
UIGraphicsEndImageContext()
return result
}
使用它調整它調整圖片的大小更小的尺寸叫它
myImage = myImage.resizeWithWidth(700)!
現在,未來你仍然可以使用自己選擇的壓縮比壓縮它
let compressData = UIImageJPEGRepresentation(myImage, 0.5) //max value is 1.0 and minimum is 0.0
let compressedImage = UIImage(data: compressData!)
這看起來像http://stackoverflow.com/a/38633826/1187415的副本。如果您認爲在此之前已經提出並回答了問題,則可以將其標記爲重複。沒有必要重複現有的答案。 –