iOS 隐藏导航条分割线

// 导航条分割线
@property (nonatomic, strong) UIView *navSeparateView;

// 获取导航条分割线
    UIView *backgroundView = [self.navigationController.navigationBar subviews].firstObject;
    for (UIView *view in backgroundView.subviews) {
        if (CGRectGetHeight([view frame]) <= 1) {
            _navSeparateView = view;
        }
    }

    // 隐藏导航条分割线
    _navSeparateView.hidden = YES;