iPhone 施用里实现截屏功能的代码

UIView *view = [[[[[UIApplication sharedApplication] windows] objectAtIndex:1] subviews] lastObject];//获得某个window的某个subView
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??? 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);
??????????? }???????????
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??????????? //获取图像
??????????? [subView.layer renderInContext:UIGraphicsGetCurrentContext()];
??????????? UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
??????????? UIGraphicsEndImageContext();
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??????????? //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!");
??????????? }
??????? }
??? }