如何在UIimageView中设置顶部避开空间的图像 [英] how to set image in top avoiding space in UIimageView

问题描述

我有一个UIImageView，其内容模式Aspect Fit的大小为220x155。我正在以不同的分辨率动态插入不同的图像，但都比UIImageView的大小大。当内容模式设置为Aspect Fit时，图像将根据比率进行缩放以适合UIImageView。

I've an UIImageView with content mode Aspect Fit of size 220x155. I'm dynamically inserting different images in different resolutions, but all larger than the size of the UIImageView. As the content mode is set to Aspect Fit, the image is scaled with respect to the ratio to fit the UIImageView.

我的问题是，如果例如里面的图像UIImageView缩放到220x100，我希望UIImageView也从155到100的高度缩小，以避免我的元素之间的空间。

My problem is, that if for instance the image inside the UIImageView is scaled to 220x100, I would like the UIImageView to shrink from a height of 155 to 100 too to avoid space between my elements.

我该怎么做？

推荐答案

我写了这个方法，一旦加载图像就给我一个图像视图的框架。
因此，对我的要求与您的情况相同：

I wrote this method to get me the frame of the image view once it loaded an image. So , the requirements for me were the same as in your case:

1）具有宽高比适合内容模式的图像视图
2）得到图像的确切框架（这样你可以重新定位图像视图）

1) image view with aspect fit content mode 2) get the exact frame of the image ( this way you can re-position the image view )

希望这会有所帮助：

- (CGRect) getFrameOfImage:(AsyncImageView *) imgView
{
    if(!imgView.loaded)
        return CGRectZero;

    CGSize imgSize      = imgView.image.size;
    CGSize frameSize    = imgView.frame.size;

    CGRect resultFrame;

    if(imgSize.width < frameSize.width && imgSize.height < frameSize.height)
    {
        resultFrame.size    = imgSize;
    }
    else
    {
        float widthRatio  = imgSize.width  / frameSize.width;
        float heightRatio = imgSize.height / frameSize.height;

        float maxRatio = MAX (widthRatio , heightRatio);
        NSLog(@"widthRatio = %.2f , heightRatio = %.2f , maxRatio = %.2f" , widthRatio , heightRatio , maxRatio);

        resultFrame.size = CGSizeMake(imgSize.width / maxRatio, imgSize.height / maxRatio);
    }

    resultFrame.origin  = CGPointMake(imgView.center.x - resultFrame.size.width/2 , imgView.center.y - resultFrame.size.height/2);

    return resultFrame;
}

我在这里使用 AsyncImageView 但它与 UIImageView 一样好用。要记住的重要一点是在加载图像后调用此方法。

I am using here AsyncImageView but it will work just as good with UIImageView. The important thing to remember is to call this method AFTER the image was loaded.

干杯！

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