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我正在调整照片大小并压缩照片,结果不正常。照片大小调整和压缩
当我从相册中选择图像时,图像压缩并调整大小。但是,如果我在从相机传来的图像上进行拍摄,则图像会变得非常小(并且无法观看)。我所做的测试是在我的按钮中分配一些压缩和调整大小的功能,以从相机源或相册中获取图像。下面是我的代码和控制台输出
@IBAction func testBtnPressed(sender: AnyObject) {
let img = selectedImageView.image!
print("before resize image \(img.dataLengh_kb)kb size \(img.size)")
let resizedImg = img.resizeWithWidth(1080)
print("1080 After resize image \(resizedImg!.dataLengh_kb)kb size \(resizedImg!.size)")
let compressedImageData = resizedImg!.mediumQualityJPEGNSData
print("Compress to medium quality = \(compressedImageData.length/1024)kb")
}
extension UIImage {
var mediumQualityJPEGNSData: NSData { return UIImageJPEGRepresentation(self, 0.5)! }
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
}
}
在之前调整图像大小5004kb大小从相册
选定的照片(3024.0,3024.0)
1080后调整大小的图像1023kb大小(1080.0, 1080.0)
压缩到中等质量= 119KB
当照片是通过相机
之前调整大小图像4653kb大小(24385.536,24385.536)传递
1080后调整大小图像25KB大小(1080.576,1080.576)
压缩到中等质量= 4KB