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阴影不起作用，为什么？我写了一个 UiBarbuttonItem ，例如：

 UIImage  *imageNomal     = [UIImage imageNamed:@"Back_A"];
 UIImage  *imageHight     = [UIImage imageNamed:@"Back_B"];
 UIButton *button    = [UIButton buttonWithType:UIButtonTypeCustom];
 button.bounds = CGRectMake(0, 0, imageNomal.size.width, imageNomal.size.height+2);
 [button.layer setShadowColor:[[UIColor whiteColor] CGColor]];
 [button.layer setShadowOffset:CGSizeMake(0, 2)];
 [button setImage:imageNomal forState:UIControlStateNormal];
 [button setImage:imageHight forState:UIControlStateHighlighted];
 [button addTarget:nav action:@selector(backClick:) forControlEvents:UIControlEventTouchUpInside];
 __autoreleasing UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
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1 回答 1

2

您需要设置shadowOpacity为大于 0 的值。

于 2013-05-08T01:04:23.690 回答