【IOS】截屏功能

-(void)ScreenShots
{
    [self unschedule:@selector(ScreenShots)];
   
    CGSize imageSize = [[UIScreen mainScreen] bounds].size;
    if (NULL != UIGraphicsBeginImageContextWithOptions) {
        UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    }
    else
    {
        UIGraphicsBeginImageContext(imageSize);
    }
   
    CGContextRef context = UIGraphicsGetCurrentContext();
   
    for (UIWindow * window in [[UIApplication sharedApplication] windows]) {
        if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen]) {
            CGContextSaveGState(context);
            CGContextTranslateCTM(context, [window center].x, [window center].y);
            CGContextConcatCTM(context, [window transform]);
            CGContextTranslateCTM(context, -[window bounds].size.width*[[window layer] anchorPoint].x, -[window bounds].size.height*[[window layer] anchorPoint].y);
            [[window layer] renderInContext:context];
           
            CGContextRestoreGState(context);
        }
    }
   
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
   
    UIGraphicsEndImageContext();
    NSThread *thread=[[NSThread alloc] initWithTarget:self selector:@selector(saveThread:) object:image];
    [thread start];
    [thread release];
 
    NSLog(@"Suceeded!");
}

-(void)saveThread:(UIImage*)image
{
    NSAutoreleasePool *pool=[[NSAutoreleasePool alloc]init];
    UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);
    [pool release];
}