运用递归算法隐藏导航栏黑线,并替换

下面两段代码都放在UINavigationController 或者自定义的UINavigationController

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    // 运用递归影藏自带的黑线
    [self hideBorderInView:self.navigationBar];
    // 需要设置成的样子
    if (!_navLineV) {
        _navLineV = [[UIView alloc]initWithFrame:CGRectMake(0, 44, kScreen_Width, 1.0/ [UIScreen mainScreen].scale)];
        _navLineV.backgroundColor = kColorCCC;
        _navLineV.backgroundColor = [UIColor redColor];
        [self.navigationBar addSubview:_navLineV];
    }
}

// 递归 遍历view的subViews 直至隐藏
- (void)hideBorderInView:(UIView *)view{

    if ([view isKindOfClass:[UIImageView class]]
        && view.frame.size.height <= 1) {
        view.hidden = YES;
    }
    for (UIView *subView in view.subviews) {
        [self hideBorderInView:subView];
    }
}

• 设置后的效果
• 

  image