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第一种方法:
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
@implementation
MyViewController {
UIImageView *navBarHairlineImageView;
}
2)在viewDidLoad中加入:
navBarHairlineImageView = [
self
findHairlineImageViewUnder:navigationBar];
3)实现找出底部横线的函数
- (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
- (
void
)viewWillAppear:(
BOOL
)animated {
[
super
viewWillAppear:animated];
navBarHairlineImageView.hidden =
YES
;
}
- (
void
)viewWillDisappear:(
BOOL
)animated {
[
super
viewWillDisappear:animated];
navBarHairlineImageView.hidden =
NO
;
}
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