iOS自带的导航栏底部横线比较粗，有时候我们想自定义，可以更改粗细或者颜色之类的。
//通过一个方法来找到这个黑线(findHairlineImageViewUnder):
- (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;
}
在界面出现时候开启隐藏
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:YES];
_navBarHairlineImageView.hidden = YES;
}
界面消失时候显示
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:YES];
_navBarHairlineImageView.hidden = NO;
}
在viewDidLoad中
- (void)viewDidLoad {
[super viewDidLoad];
_navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
_navBarHairlineImageView.hidden = YES;
UIImageView *navLine = [[UIImageView alloc]initWithFrame:_navBarHairlineImageView.frame];
// navLine.backgroundColor = [UIColor blueColor];
navLine.image = [UIImage imageNamed:@"GrayLine"];//可以对navLine进行操作
[self.navigationController.view addSubview:navLine];
}
在这里我们用自定义的UIimageview代替导航栏底部。
2019.3.20更新
影藏导航栏底部横线
self.navigationController.navigationBar.clipsToBounds = YES;
