以编程方式创建居中的 UIBarButton

Question

我有一组条形按钮，我通常将它们设置为：

 NSArray *leftButtonArray = [[NSArray alloc]initWithObjects: backBarButton, separator1,postBarButton, separator1, memeBarButton, separator1, pollBarButton, nil];
self.navigationItem.leftBarButtonItems = leftButtonArray;

但是，我想将左侧的这些按钮改为居中对齐。任何人都知道我该怎么做？提供示例或使用我的按钮来执行此操作将是一个加号。

谢谢！

Answer 1

据我了解，您的问题需要一些按钮在左侧，一些在中间，一些在右侧，并带有相对分隔符。直接导航不会提供把button放在中间，或者在TitleView

您可以像这样为导航栏设置自定义标题视图。

//To hide default back button
self.navigationItem.hidesBackButton=YES;

//Title View for Navigation
UIView *navTitle1 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
[navTitle1 setBackgroundColor:[UIColor lightGrayColor]];

//Left View button and separator
UIButton *backBarButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 44)];
[backBarButton setTitle:@"Back" forState:UIControlStateNormal];

UIView *ttlview1 = [[UIView alloc] initWithFrame:CGRectMake(51, 0, 1, 44)];
[ttlview1 setBackgroundColor:[UIColor darkGrayColor]];


//Center view with two buttons and seprator for them
UIView *middleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 121, 44)];
[middleView setBackgroundColor:[UIColor clearColor]];
[middleView setCenter:navTitle1.center];

UIButton *postBarButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 60, 44)];
[postBarButton setTitle:@"Post" forState:UIControlStateNormal];

UIView *ttlview2 = [[UIView alloc] initWithFrame:CGRectMake(middleView.frame.size.width/2, 0, 1, 44)];
[ttlview2 setBackgroundColor:[UIColor darkGrayColor]];

UIButton *memeBarButton = [[UIButton alloc] initWithFrame:CGRectMake((middleView.frame.size.width/2)+1, 0, 60, 44)];
[memeBarButton setTitle:@"Meme" forState:UIControlStateNormal];

[middleView addSubview:ttlview2];
[middleView addSubview:postBarButton];
[middleView addSubview:memeBarButton];

//Right button with seprator before that
UIView *ttlview3 = [[UIView alloc] initWithFrame:CGRectMake(self.view.frame.size.width-71, 0, 1, 44)];
[ttlview3 setBackgroundColor:[UIColor darkGrayColor]];

UIButton *pollBarButton = [[UIButton alloc] initWithFrame:CGRectMake(self.view.frame.size.width-70, 0, 50, 44)];
[pollBarButton setTitle:@"POLL" forState:UIControlStateNormal];

[navTitle1 addSubview:backBarButton];
[navTitle1 addSubview:ttlview1];
[navTitle1 addSubview:middleView];
[navTitle1 addSubview:ttlview3];
[navTitle1 addSubview:pollBarButton];
self.navigationItem.titleView = navTitle1;

看起来像，THIS

也许这会对你有所帮助。

HTH，享受编码吧！

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