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 ]];
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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;
}
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2)在viewDidLoad中加入:
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navBarHairlineImageView = [ self findHairlineImageViewUnder:navigationBar];
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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 ;
}
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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 ;
}
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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
时间: 2024-10-27 18:46:01