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所以我有UIView一个原型UITableViewCell。在该视图的awakeFromNib方法中,我有以下代码来制作阴影

CALayer *layer = self.layer;

layer.cornerRadius = 5.0f;

// Makes shadow for each cell in all and nearby table views.

CGSize size = self.bounds.size;
CGFloat curlFactor = 15.0f;
CGFloat shadowDepth = 5.0f;

UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0.0f, 0.0f)];
[path addLineToPoint:CGPointMake(size.width, 0.0f)];
[path addLineToPoint:CGPointMake(size.width, size.height + shadowDepth)];
[path addCurveToPoint:CGPointMake(0.0f, size.height + shadowDepth)
        controlPoint1:CGPointMake(size.width - curlFactor, size.height + shadowDepth - curlFactor)
        controlPoint2:CGPointMake(curlFactor, size.height + shadowDepth - curlFactor)];

self.layer.shadowColor = [UIColor blackColor].CGColor;
self.layer.shadowOpacity = 0.3f;
self.layer.shadowOffset = CGSizeMake(2.0f, 7.0f);
self.layer.shadowRadius = 2.0f;
self.layer.masksToBounds = NO;
self.layer.shadowPath =  path.CGPath; //Sets a path for the shadow. Greatly enhances performance.

问题是阴影只出现在某些单元格上,而不是全部,而且有时似乎是随机的。我试着把代码放进去viewWillAppearviewDidAppear但它也没有在那里一起工作。有没有人知道可能导致这种情况的原因?

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1 回答 1

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我终于意识到问题在于阴影并没有丢失,它们只是被其他单元格重叠了。

所以这个答案sendSubviewToBack:可以解决问题(在这种情况下你需要)。

仅供参考,iOS 6 中的新UICollectionView将让您更好地控制单元格 z 索引,对于 iOS 6 之前的支持,PSTCollectionView是一个不错的选择。

于 2013-01-11T03:41:16.830 回答