将UIView捕获为UIImage [英] Capture UIView as UIImage
本文介绍了将UIView捕获为UIImage的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我一直在使用此方法将 UIView
转换为 UIImage
。即视图的屏幕快照 -
I have been using this method to convert a UIView
into UIImage
. i.e. screen snapshot of a view -
@interface UIView(Extended)
- (UIImage *) imageByRenderingView;
@end
@implementation UIView(Extended)
- (UIImage *)imageByRenderingView
{
UIGraphicsBeginImageContext(self.bounds.size);
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}
@end
要使用它,我会这样做这个 -
To use it, I do this -
UIImage * currImage = [self.view imageByRenderingView];
这给出了整个 UIView
的图像表示。现在我想要2张图片,一张是 UIView
的上半部分,另一张是下半部分。我该怎么做?
This gives the image representation of the entire UIView
. Now I want 2 images, one is of the top half of the UIView
and the other is the bottom half. How do I do that?
推荐答案
你可以拆分你的 UIImage
两个使用此代码:
You can split your UIImage
in two by using this code:
CGImageRef topOfImageCG =
CGImageCreateWithImageInRect(currImage.CGImage,
CGRectMake(0,
0,
currImage.size.width,
currImage.size.height / 2.0));
UIImage *topOfImage = [UIImage imageWithCGImage:topOfImageCG];
CGImageRelease(topOfImageCG);
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