/**设置导航栏阴影*/
//设置阴影颜色
self.navigationController.navigationBar.layer.shadowColor = [UIColor redColor].CGColor;
//设置阴影偏移范围
self.navigationController.navigationBar.layer.shadowOffset = CGSizeMake(0, 5);
//设置阴影透明度
self.navigationController.navigationBar.layer.shadowOpacity = 0.2;
//设置阴影半径
self.navigationController.navigationBar.layer.shadowRadius = 15;
//设置阴影路径
self.navigationController.navigationBar.layer.shadowPath = [UIBezierPath bezierPathWithRect:self.navigationController.navigationBar.bounds].CGPath;
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