ios - 隐藏/显示导航栏中两个右侧栏按钮之一

Question

我使用xcode7在iOS9.0的导航栏上实现了两个右栏按钮项，我想在指定条件下隐藏/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

试试这个:

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

然后调用上面的方法，传入你要隐藏的bar button

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