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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