Ios UINavigationBar中的对中UIButton不工作

_导航栏中的UIButton不居中

//Create UIButton
UIButton *closeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[closeButton setTitle:@"Close" forState:UIControlStateNormal];
//Create Navigation Item
UINavigationItem *navigationItem = [[UINavigationItem alloc]init]; 
CGRect screenRect = [[UIScreen mainScreen] bounds]; 
CGPoint center = CGPointMake(screenRect.size.width/2, 0.0f);
//Center titleView of Navigation Item and add closeButton
[navigationItem.titleView setCenter:center];
[navigationItem setTitleView:closeButton];
[_navigationBar setItems:@[navigationItem]];

它显示为始终与右侧对齐：

任何帮助都将不胜感激。谢谢

默认情况下，UINavigationItem的标题视图已居中。我认为你代码中的设置中心是导致问题的原因。试试这个：

UIButton *closeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[closeButton setTitle:@"Close" forState:UIControlStateNormal];
//Create Navigation Item
UINavigationItem *navigationItem = [[UINavigationItem alloc]init]; 

[navigationItem setTitleView:closeButton];

[_navigationBar setItems:@[navigationItem]];

编辑：视图控制器应该已经有一个导航项供您修改。试试这个代码

UIButton *closeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [closeButton setTitle:@"Close" forState:UIControlStateNormal];

self.navigationItem.titleView = closeButton;

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我认为你没有正确访问你的导航栏。如果这是UIViewController，您应该已经有了要修改的navigationItem。请看我的编辑。我刚刚试过这个，效果非常好。。。所以这应该行得通。我将UINavigationBar拖到ViewController上，并且_navigationBar与之相连。我尝试了你的方法，但我认为我的UIViewController没有navigationItem，因为navigationBar是空的。哎呀，我没有意识到你必须固定UINavigationBar。谢谢你的帮助。我是个白痴