UIImage調整方面填充和裁剪的大小

Question

我有這個代碼，我用這個尺寸的2448x3264拍照，我需要調整大小並調整到左上角的屏幕顯示。 對不起我的英語謝謝

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

    imagenUsr = [info objectForKey:UIImagePickerControllerOriginalImage];

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


}

我需要調整到320x568寬高比以填充所拍攝圖像的頂部和左側

Answer 1

試試這個：

- (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;
}

這將幫助您像以前一樣保持縱橫比。

另一種方式是：

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

希望這可以幫助.. ：）

Answer 2

Swift 3.0 / 4.0

AspectFill圖像裁剪/調整大小...根據UIImageview框架大小。

    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
}

Answer 3

編輯：不確定我是否錯過了它或它被編輯，但我沒有看到你想要裁剪它。 拉沙德的解決方案應該適合你。

您是否嘗試使用圖像創建圖像視圖並將其添加到視圖中？

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    imagenUsr = [info objectForKey:UIImagePickerControllerOriginalImage];

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.frame];
    imageView.image = imagenUsr;
    imageView.contentMode = UIViewContentModeScaleAspectFit;
    [self.view addSubview:imageView];
}