@interface ViewController{
UIImageView*navBarHairlineImageView;
}
2）在viewDidLoad中加入：
navBarHairlineImageView = [selffindHairlineImageViewUnder:self.navigationController.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 = [selffindHairlineImageViewUnder:subview];
if(imageView) {
return imageView;
}
}return nil;
}
4）最后在viewWillAppear，viewWillDisappear中处理
- (void)viewWillAppear:(BOOL)animated {
[superviewWillAppear:animated];
navBarHairlineImageView.hidden=YES;
}
- (void)viewWillDisappear:(BOOL)animated {
[superviewWillDisappear:animated];
navBarHairlineImageView.hidden=NO;
}
===========================================================================
下面来一个最简单的：
UINavigationBar*navigationBar =self.navigationController.navigationBar;
// bg.png为自己ps出来的想要的背景颜色。
[navigationBar setBackgroundImage:[UIImageimageNamed:@"bg.png"] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
[navigationBar setShadowImage:[UIImagenew]];
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)
