UIImage调整方面填充和裁剪的大小

Question

我有这个代码,我用这个尺寸的2448x3264拍照,我需要调整大小并调整到左上角的屏幕显示.对不起我的英语谢谢

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

    imagenUsr = [info objectForKey:UIImagePickerControllerOriginalImage];

    NSLog(@"%f",imagenUsr.size.height);   //2448px
    NSLog(@"%f",imagenUsr.size.width);   //3264px


}

我需要调整到320x568宽高比以填充所拍摄图像的顶部和左侧

Answer 1

试试这个:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    imagenUsr = [info objectForKey:UIImagePickerControllerOriginalImage];
    double width = imagenUsr.size.width;
    double height = imagenUsr.size.height;
    double screenWidth = self.view.frame.size.width;
    double apect = width/height;
    double nHeight = screenWidth/ apect;
    self.imgView.frame = CGRectMake(0, 0, screenWidth, nHeight);
    self.imgView.center = self.view.center;
    self.imgView.image = imagenUsr;
}

这将帮助您像以前一样保持纵横比.

另一种方式是:

self.imgView.contentMode = UIViewContentModeScaleAspectFit;
self.imgView.image = imagenUsr;

希望这可以帮助.. :)

Answer 2

斯威夫特 3.0 / 4.0

AspectFill 图像裁剪/调整大小...根据 UIImageview 帧大小。

    func ResizeImage(with image: UIImage?, scaledToFill size: CGSize) -> UIImage? {
    let scale: CGFloat = max(size.width / (image?.size.width ?? 0.0), size.height / (image?.size.height ?? 0.0))
    let width: CGFloat = (image?.size.width ?? 0.0) * scale
    let height: CGFloat = (image?.size.height ?? 0.0) * scale
    let imageRect = CGRect(x: (size.width - width) / 2.0, y: (size.height - height) / 2.0, width: width, height: height)
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    image?.draw(in: imageRect)
    let newImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage
}