iOS去掉导航栏底部的线

 

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;
}

 

 

PS:第二种方法可以保持bar的translucent

 

posted @ 2018-08-01 17:21  落花伊人  阅读(783)  评论(0编辑  收藏  举报