[新手请教] 如何让 UIView 点击一下 backgroundColor 变深然后再变回来（类似按钮点击后的交互效果）

- (void )loadView
{
    self.view = [UIView new];

    UIView *shareView = [UIView new];
    [self.view addSubview:shareView];
    shareView.backgroundColor = [UIColor colorWithRGBA:0xEEEEEEFF];
    shareView.userInteractionEnabled = YES;
    UITapGestureRecognizer *gestureForShare = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector (shareViewClicked:)];
    gestureForShare.numberOfTapsRequired = 1;
    [shareView addGestureRecognizer:gestureForShare];
}

- (void )shareViewClicked:(UITapGestureRecognizer *)gestureRecognizer
{
    gestureRecognizer.view.backgroundColor = [UIColor colorWithRGBA:0xDDDDDDFF];
    // 背景变暗持续 0.2s 后变回来
    dispatch_after (dispatch_time (DISPATCH_TIME_NOW, (int64_t )(0.2 * NSEC_PER_SEC )), dispatch_get_main_queue (), ^{
        gestureRecognizer.view.backgroundColor = [UIColor colorWithRGBA:0xEEEEEEFF];
    });
}