_scrollView.delaysContentTouches = NO;   //延迟


[button addTarget:self action:@selector(changeButtonBackGroundColor:) forControlEvents:UIControlEventTouchDown];



-(void)changeButtonBackGroundColor:(UIButton*) sender{
    NSLog(@"changeButtonBackGroundColor...");
    if ([sender.backgroundColor isEqual:[UIColor clearColor]]){
        UIImage *image = [self mergeBackgroundImage];
        [sender setBackgroundColor:[UIColor colorWithPatternImage:image]];
    }else{
        [sender setBackgroundColor:[UIColor redColor]];
    }
}