使用UIImageView調整UIImage

Question

我有一個UIImage，並且我想基於UIImageView調整設備上顯示的內容。

UIImage是：

UIImage *image = // a PNG I have

// width = 1200
CGFloat width = image.size.width;

// height = 900
CGFloat height = image.size.height;

我有一個UIImageView

UIImageView *iview = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 675.0, 900.0)];

如何在不調整縱橫比的情況下將UIImage放入UIImageView？ 我想將UIImage裁剪掉嗎？

Answer 1

希望這可以幫助

-(UIImage*)crop:(CGRect)frame
{
    // Find the scalefactors  UIImageView's widht and height / UIImage width and height
    CGFloat widthScale = self.bounds.size.width / self.image.size.width;
    CGFloat heightScale = self.bounds.size.height / self.image.size.height;

    // Calculate the right crop rectangle 
    frame.origin.x = frame.origin.x * (1 / widthScale);
    frame.origin.y = frame.origin.y * (1 / heightScale);
    frame.size.width = frame.size.width * (1 / widthScale);
    frame.size.height = frame.size.height * (1 / heightScale);

    // Create a new UIImage
    CGImageRef imageRef = CGImageCreateWithImageInRect(self.image.CGImage, frame);
    UIImage *croppedImage = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);

    return croppedImage;//(return value is uiimage)
}

然后將其添加到uiimageview

Answer 2

嘗試將UIImageView的contentMode屬性設置為UIViewContentModeScaleAspectFill ，根據文檔，該屬性是：

The option to scale the content to fill the size of the view. Some portion of the 
content may be clipped to fill the view’s bounds.

您可以在UIView文檔中看到其他選項。

Answer 3

如果您想修剪邊緣並居中圖像的位置，則將Imageview屬性設置為AspectFill

myImageView.contentMode = UIViewContentModeScaleAspectFill; 
myImageView.clipsToBounds = YES;

希望這可以幫助