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默认情况下会有这条线
第一种方法:
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UINavigationBar *navigationBar = self .navigationController.navigationBar; // white.png图片自己下载个纯白色的色块,或者自己ps做一个 [navigationBar setBackgroundImage:[UIImage imageNamed: @"white.png" ] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault]; [navigationBar setShadowImage:[UIImage new ]]; |
运行后效果如下(此处原有的灰色背景色会被white.png代替):
PS:这是唯一一个隐藏这条线的官方用法,但是有一个缺陷-删除了translucency(半透明)
第二种方法:
1)声明UIImageView变量,存储底部横线
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@implementation MyViewController { UIImageView *navBarHairlineImageView; } |
2)在viewDidLoad中加入:
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navBarHairlineImageView = [ self findHairlineImageViewUnder:navigationBar]; |
3)实现找出底部横线的函数
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- (UIImageView *)findHairlineImageViewUnder:(UIView *)view { if ([view isKindOfClass:UIImageView. class ] && view.bounds.size.height <= 1.0) { return (UIImageView *)view; } for (UIView *subview in view.subviews) { UIImageView *imageView = [ self findHairlineImageViewUnder:subview]; if (imageView) { return imageView; } } return nil ; } |
4)最后在viewWillAppear,viewWillDisappear中处理
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- ( void )viewWillAppear:( BOOL )animated { [ super viewWillAppear:animated]; navBarHairlineImageView.hidden = YES ; } - ( void )viewWillDisappear:( BOOL )animated { [ super viewWillDisappear:animated]; navBarHairlineImageView.hidden = NO ; } |
效果如下:
PS:第二种方法可以保持bar的translucent
本文出自 IT985博客
本文永久地址:http://blog.it985.com/9808.html
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原文地址:http://www.cnblogs.com/183damon/p/5288518.html