navigationController 阴影
http://hi.baidu.com/sonnywh/blog/item/3bcbba4b4f7a2bea83025c68.html
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在.h中加入#import?<QuartzCore/QuartzCore.h>? ??
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CALayer?*navLayer =?self.navigationController.navigationBar.layer;
? ? navLayer.masksToBounds?=?NO;
? ? navLayer.shadowColor?= [UIColor?blackColor].CGColor;
? ? navLayer.shadowOffset?=?CGSizeMake(0.0,?4.0);
? ? navLayer.shadowOpacity?=?0.25f;
? ? navLayer.shouldRasterize?=?YES
