隐藏/显示导航栏中的两个右栏中的按钮之一

Question

[我使用xcode7在iOS9.0中的导航栏上实现了两个右栏按钮项，我想以指定条件隐藏/显示一个右栏按钮。我正在使用以下代码。请帮助我

UIBarButtonItem *selectButton= [[UIBarButtonItem alloc]initWithTitle:@"Select" style:UIBarButtonItemStylePlain target:self action:@selector(clickOnSelect:)];

UIBarButtonItem *shareButton = [[UIBarButtonItem alloc]initWithTitle:@"Share" style:UIBarButtonItemStylePlain target:self action:@selector(clickOnShare:)];

self.navigationItem.rightBarButtonItems = @[selectButton,shareButton];

-(void)clickOnSelect:(id)sender{

 NSLog(@"self.navigationItem.rightBarButtonItems  :%@",self.navigationItem.rightBarButtonItems);        
 UIBarButtonItem *shareButton = (UIBarButtonItem *) [self.navigationItem.rightBarButtonItems objectAtIndex:1];  
 shareButton.customView.hidden = YES; // its not working

 }

Answer 1

尝试一下：

-(void) changeBarButtonVisibility:(UIBarButtonItem*) barButtonItem visibility:(BOOL) shouldShow {
    UIColor *tintColor = shouldShow == NO ? [UIColor clearColor] : nil;
    [barButtonItem setEnabled:shouldShow];
    [barButtonItem setTintColor:tintColor];
}

并调用上述方法并传递您要隐藏的条形按钮

[self changeBarButtonVisibility:self.navigationItem.rightBarButtonItems[0] visibility:NO];
[self changeBarButtonVisibility:self.navigationItem.rightBarButtonItems[1] visibility:YES];

Answer 2

本机UIBarButtonItem没有“ .hidden”属性。

列出了许多可能的答案in this very related question，我认为最适合您的方法是尝试将UIBarButtonItem子类化（HidableBarButtonItem子类），仅在标题应该被隐藏的情况下才用空字符串替换标题。

Answer 3

尝试一下

-(UIBarButtonItem *)getLeftBarbuttonItem{

  UIButton *menuButton = [UIButton buttonWithType:UIButtonTypeCustom];
  menuButton.frame = CGRectMake(0, 0, 24, 24);
  [menuButton setImage:[UIImage imageNamed:@"menu-icon.png"] forState:UIControlStateNormal];
  [menuButton addTarget:self.revealController action:@selector(revealToggle:) forControlEvents:UIControlEventTouchUpInside];

  UIBarButtonItem *leftbarButton = [[UIBarButtonItem alloc] initWithCustomView:menuButton];
  return leftbarButton;

 }

 -(void)showNavBarItem:(BOOL)isShow{

  if(isShow){
      [self.navigationItem setLeftBarButtonItem:[self getLeftBarbuttonItem] animated:true];
  }else{
      [self.navigationItem setLeftBarButtonItem:nil animated:true];
   }

 }

右侧BarButton隐藏

   -(UIBarButtonItem *)getFirstBarbuttonItem:(BOOL)isHide{

   UIButton *menuButton = [UIButton buttonWithType:UIButtonTypeCustom];
    menuButton.frame = CGRectMake(0, 0, 24, 24);
   [menuButton setImage:[UIImage imageNamed:@"menu-icon.png"] forState:UIControlStateNormal];
   [menuButton addTarget:self.revealController action:@selector(revealToggle:) forControlEvents:UIControlEventTouchUpInside];
   menuButton.hidden = isHide;
   UIBarButtonItem *leftbarButton = [[UIBarButtonItem alloc] initWithCustomView:menuButton];
return leftbarButton;
  }

 -(UIBarButtonItem *)getSecondBarbuttonItem:(BOOL)isHide{

    UIButton *menuButton = [UIButton buttonWithType:UIButtonTypeCustom];
    menuButton.frame = CGRectMake(0, 0, 24, 24);
    [menuButton setImage:[UIImage imageNamed:@"menu-icon.png"] forState:UIControlStateNormal];
   [menuButton addTarget:self.revealController action:@selector(revealToggle:) forControlEvents:UIControlEventTouchUpInside];
   menuButton.hidden = isHide;
   UIBarButtonItem *leftbarButton = [[UIBarButtonItem alloc] initWithCustomView:menuButton];
   return leftbarButton;
  }

  self.navigationItem.rightBarButtonItems = @[[self getFirstBarbuttonItem:YES],[self getSecondBarbuttonItem:NO]];

Answer 4

对于Swift 5.1

self.navigationItem.rightBarButtonItems?.remove(at: [indexOfButton])

This helped me