UIView 增加触摸效果

UIViewTouchStyle.m

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    [self setBackgroundColor:[UIColor colorWithRed:227/255.0 green:227/255.0 blue:227/255.0 alpha:1.0]];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];
    [self setBackgroundColor:[UIColor colorWithRed:255/255.0 green:255/255.0 blue:255/255.0 alpha:1.0]];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesCancelled:touches withEvent:event];
    [self setBackgroundColor:[UIColor colorWithRed:255/255.0 green:255/255.0 blue:255/255.0 alpha:1.0]];
}