iPhone屏幕捕获视图 [英] iPhone screen capture for a view

问题描述

在iphone上，是否有可能屏幕捕获一个UIView及其所有子视图？如果可能，怎么办？

On iphone, is it possible to "screen capture" an UIView and all its subview? If it is possible, how?

推荐答案

我发现了这个，但没有尝试过：

I found this, but haven't tried out myself:

http://reusablesnippets.posterous.com/capture-uiview

在这里您可以找到使用的 -renderInContext： http://developer.apple。 com / mac / library / documentation / GraphicsImaging / Reference / CALayer_class / Introduction / Introduction.html＃// apple_ref / doc / uid / TP40004500-CH1-SW120

Here you find the used -renderInContext: http://developer.apple.com/mac/library/documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html#//apple_ref/doc/uid/TP40004500-CH1-SW120

编辑

我将上述代码转换为UIView上的类别。
调用它像这样： [aView saveScreenshotToPhotosAlbum];

I transformed the codes above to a category on UIView. call it like this: [aView saveScreenshotToPhotosAlbum];

#import <QuartzCore/QuartzCore.h>

- (UIImage*)captureView {

    CGRect rect = [[UIScreen mainScreen] bounds];  
    UIGraphicsBeginImageContext(rect.size);     
    CGContextRef context = UIGraphicsGetCurrentContext();  
    [self.layer renderInContext:context];  
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();  
    return img;
}



- (void)saveScreenshotToPhotosAlbum {
    UIImageWriteToSavedPhotosAlbum([self captureView], nil, nil, nil);

}

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