给界面上任何控件截图并保存为PNG的方法

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UIView *view = [[[[[UIApplication sharedApplication] windows] objectAtIndex:1] subviews] lastObject];//获得某个window的某个subView

  

NSInteger index = 0;//用来给保存的png命名

for (UIView *subView in [view subviews]) {//遍历这个view的subViews

    if ([subView isKindOfClass:NSClassFromString(@"UIImageView")] || [subView isKindOfClass:NSClassFromString(@"UIThreePartButton")]) {//找到自己需要的subView

        //支持retina高分的关键

        if(UIGraphicsBeginImageContextWithOptions != NULL)

        {

            UIGraphicsBeginImageContextWithOptions(subView.frame.size, NO, 0.0);

        } else {

            UIGraphicsBeginImageContext(subView.frame.size);

        }            

          

        //获取图像

        [subView.layer renderInContext:UIGraphicsGetCurrentContext()];

        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

          

        //保存图像

        NSString *path = [NSHomeDirectory() stringByAppendingFormat:@"/%d.png",index];

        if ([UIImagePNGRepresentation(image) writeToFile:path atomically:YES]) {

            index += 1;

            NSLog(@"Succeeded!");

        }

        else {

            NSLog(@"Failed!");

        }

    }

}


在真机上可以用以下私有函数截屏，不过苹果会reject用了这个函数的软件。

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CGImageRef UIGetScreenImage(); @interface UIImage (ScreenImage) + (UIImage *)imageWithScreenContents; @end    @implementation UIImage (ScreenImage) + (UIImage *)imageWithScreenContents {     CGImageRef cgScreen = UIGetScreenImage();     if (cgScreen) {         UIImage *result = [UIImage imageWithCGImage:cgScreen];         CGImageRelease(cgScreen);         return result;     }     return nil; } @end