UITableView层上的内部阴影？ [英] Inner shadow on UITableView layer?

问题描述

我需要添加一个内部阴影效果到我的UITableView。我发现了有关向UIView图层添加内部阴影的有用文章：

然后指示新的UIView子类通过实现以下方法将所有触摸事件转发到基础视图控制器：

   - （BOOL）pointInside：（CGPoint）point withEvent：（UIEvent *）event {
 return NO; 
} 
  

最后，我将新视图作为子视图添加到我的主视图中，set

   - （void）viewDidLoad { 
 InnerShadowView * shadowView = [[InnerShadowView alloc] init]; 
 [self.view addSubview：shadowView]; 
 shadowView.frame = _tableView.frame; 
 shadowView.backgroundColor = [UIColor clearColor]; 
 [self.view bringSubviewToFront：shadowView]; 
} 
  

I need to add an inner shadow effect to my UITableView. I've discovered this helpful post on adding an inner shadow to a UIView layer: Inner shadow effect on UIView layer?

The problem arises when I attempt to use this technique on a UITableView because the UITableView's cells are displayed on top, covering the shadow.

I've played around with adding the UITableView as a subview to a UIView (with the inner shadow) to no effect.

My UITableView is centered on the UIViewController's view with a dark gray background. Giving the UITableView an inner shadow would give the background the effect of being a bezel for the table view.

How would I best achieve the effect I'm looking for on a UITableView?

解决方案

Answering my own question:

I ended up subclassing a UIView and implementing the drawRect function using this post: Inner shadow effect on UIView layer?

Then instructed the new UIView subclass to forward all touch events through to the underlying view controllers by implementing the following method:

-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    return NO;
}

Finally, I added the new view as a subview to my main view, set its background to be transparent, positioned it on top of the tableView and brought it to the front.

- (void)viewDidLoad {
    InnerShadowView *shadowView = [[InnerShadowView alloc] init];
    [self.view addSubview:shadowView];
    shadowView.frame = _tableView.frame;
    shadowView.backgroundColor = [UIColor clearColor];
    [self.view bringSubviewToFront:shadowView];
}

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