关于NavigationController的简单设置

删除navigationBar下面的横线方法

• 声明用来存放下方横线的属性

_navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];

• 设置找到该横线的方法

- (UIImageView *)findHairlineImageViewUnder:(UIView *)view {
      /** 如果这个类是UIImageView类并且高度小于1 的话直接返回. */
    if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {
        return (UIImageView *)view;
    }
     /** 遍历传入的view上面的子视图. */
    for (UIView *subView in view.subviews) {
     /** 回调此方法. 直到找到下方横线的ImageView并返回*/
        UIImageView *imageView = [self findHairlineImageViewUnder:subView];
        if (imageView) {
            return imageView;
        }
    }
    return nil;
}

• 在- (void)viewWillAppear:(BOOL)animated 和- (void)viewWillDisappear:(BOOL)animated两个方法中设置view 的隐藏.

 - (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    _navBarHairlineImageView.hidden = YES;
}
 - (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    _navBarHairlineImageView.hidden = NO;
}

这样就可以是下方的横线消失.

设置title字体颜色和大小

    self.navigationItem.title = @"通讯录";
    self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor],NSFontAttributeName : [UIFont boldSystemFontOfSize:18]};
    

设置leftBarButtonItem的颜色

    self.navigationController.navigationBar.tintColor = [UIColor whiteColor];