如何自动调整图像的大小，但是要在ImageView的顶部(以Xcode编程)? [英] How do I autoresize an image, but at the top of the ImageView (programmatically in Xcode)?

问题描述

我有一个imageView(例如100x100)，我想用一个(较小的)图像(例如50x10)填充，我希望该图像位于视图的顶部，而不是视图的中间.

I have an imageView (say 100x100) that I want to fill with a (smaller) image (say 50x10) and I want the image to go at the top of the view, not at the middle of the view.

如果我使用

imageView.contentMode = UIViewContentModeScaleAspectFit;

它以比例为100x20(按预期)的图像填充视图，但位于视图的中间.

it fills the view with the image scaled at 100x20 (as expected) but in the middle of the view.

赞:

+---------+
|         |
|i m a g e| <---my image (scaled)
|         |
+---------+ <---my UIImageView

如果我设置

imageView.contentMode = UIViewContentModeTop | UIViewContentModeScaleAspectFit;

我明白了:

+---------+
|  image  | <---my image (not scaled)
|         |
|         |
+---------+

图像未未缩放，并且在imageView的中间停留在50x10(按照UIViewContentModeTop的指示，但是忽略了UIViewContentModeScaleAspectFit).

The image is not scaled and it stays at 50x10 in the middle of the imageView (as instructed by the UIViewContentModeTop, but it ignores UIViewContentModeScaleAspectFit).

如何让我接受两者?像这样:

How do I get it to accept both? Like this:

+---------+
|i m a g e|
|         |
|         |
+---------+

推荐答案

这可能是最糟糕的解决方案，但它可行，您应该先设置图像视图的框架，然后调用此方法.

This could be the worst solution but it works, You should set the frame of your image view first and then call this method.

-(void)adjustImageViewWithImageDimension:(CGRect)frame{
    UIImageView *tempView = [[UIImageView alloc] initWithFrame:frame];
    tempView.image = self.image;
    tempView.contentMode = UIViewContentModeScaleAspectFill;
    tempView.clipsToBounds = false;
    CGFloat oldAlpha = self.alpha;
    self.alpha = 1;
    UIGraphicsBeginImageContext(tempView.bounds.size);
    [tempView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    self.alpha = oldAlpha;
    self.image = resultingImage;
    self.contentMode = UIViewContentModeTop;
    self.clipsToBounds = YES;
}

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