iPhone UITableViewCell图层阴影 [英] iPhone UITableViewCell layer shadow

问题描述

我正在尝试使用layer.shadowColor，Offset，Radius向UITableViewCell添加阴影，但它似乎不会以任何方式影响它。该表是分组样式。有什么想法吗？

I'm trying to add a shadow to a UITableViewCell using the layer.shadowColor, Offset, Radius but it doesn't seem to affect it in any way. The table is grouped style. Any ideas why?

这是我正在使用的代码：

Here is the code i'm using:

cell.layer.shadowColor= [UIColor blackColor].CGColor;
cell.layer.shadowRadius = 5.0;
cell.layer.shadowOffset = CGSizeMake(10, 10);

推荐答案

您还需要设置阴影不透明度，默认为为0，如果没有明确设置，你将看不到任何东西。

You need to also set the shadow opacity, it defaults to 0 and you won't see anything if you don't explicitly set it.

CALayer Reference

cell.layer.shadowOffset = CGSizeMake(1, 0);
cell.layer.shadowColor = [[UIColor blackColor] CGColor];
cell.layer.shadowRadius = 5;
cell.layer.shadowOpacity = .25;

另请注意，如果您没有设置阴影路径，iPhone上的性能会很糟糕/ iPad的。使用类似下面的代码来设置阴影路径，它不需要模糊tableviewcell下面的图层来创建高质量阴影。

Also note, that if you don't set the shadow path you will have terrible performance on the iPhone/iPad. Use something like the following code to set a shadow path, it removes the need to blur the layers underneath your tableviewcell's to create a "high quality" shadow.

CGRect shadowFrame = cell.layer.bounds;
CGPathRef shadowPath = [UIBezierPath bezierPathWithRect:shadowFrame].CGPath;
cell.layer.shadowPath = shadowPath;

观看视频425（也是424和426）以了解更多关于WWDC 2010视频的信息： WWDC 2010会话视频

Watch video 425 (also 424 and 426) to learn more about shadows from the WWDC 2010 Videos available here: WWDC 2010 Session Videos

这篇关于iPhone UITableViewCell图层阴影的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！