///图片压缩方法
func resetImgSize(sourceImage:UIImage, maxImageLength:CGFloat, maxSizeKB:CGFloat) -> UIImage {
var maxSize = maxSizeKB
var maxImageSize = maxImageLength
if (maxSize <= 0.0) {
maxSize = 1024.0
}
if (maxImageSize <= 0.0) {
maxImageSize = 1024.0
}
//先调整分辨率
var newSize = CGSize.init(width: sourceImage.size.width, height: sourceImage.size.height)
let tempHeight = newSize.height/maxImageSize
let tempWidth = newSize.width/maxImageSize;
if (tempWidth > 1.0 && tempWidth > tempHeight) {
newSize = CGSize.init(width: sourceImage.size.width / tempWidth, height: sourceImage.size.height / tempWidth)
} else if (tempHeight > 1.0 && tempWidth < tempHeight){
newSize = CGSize.init(width: sourceImage.size.width / tempHeight, height: sourceImage.size.height / tempHeight)
}
UIGraphicsBeginImageContext(newSize)
sourceImage.draw(in: CGRect.init(x: 0, y: 0, width: newSize.width, height: newSize.height))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
var imageData = UIImageJPEGRepresentation(newImage!, 1.0)
var sizeOriginKB : CGFloat = CGFloat((imageData?.count)!) / 1024.0
//调整大小
var resizeRate = 0.9
while (sizeOriginKB > maxSize && resizeRate > 0.1) {
imageData = UIImageJPEGRepresentation(newImage!,CGFloat(resizeRate))
sizeOriginKB = CGFloat((imageData?.count)!) / 1024.0
resizeRate -= 0.1
}
return UIImage.init(data: imageData!)!
}
压缩图片
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