UINavigationBar标题

Question

我正在尝试使用UILabel替换UINavigationBar上的标题，代码如下：

UINavigationBar *bar = [self.navigationController navigationBar];
    [bar setBackgroundColor:[UIColor blackColor]];

    UILabel * nav_title = [[UILabel alloc] initWithFrame:CGRectMake(80, 2, 220, 25)];
    nav_title.font = [UIFont fontWithName:@"Arial-BoldMT" size:18];
    nav_title.textColor = [UIColor whiteColor];
    nav_title.adjustsFontSizeToFitWidth = YES;
    nav_title.text = title;
    nav_title.backgroundColor = [UIColor clearColor];
    [bar addSubview:nav_title];
    [nav_title release];

问题是，我如何删除栏的原始标题？我没有声明任何self.title =@“标题”，但它总是在那里显示它：

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如果我做self.title = nil，那么所有的东西都没有了...如何从导航栏中删除这个神秘的标题，只使用我创建的UILabel。

Answer 1

为什么不直接做self.title = @"“呢？

编辑:试试这个？

UINavigationBar *bar = [self.navigationController navigationBar];
[bar setBackgroundColor:[UIColor blackColor]];

UILabel * nav_title = [[UILabel alloc] initWithFrame:CGRectMake(80, 2, 220, 25)];
nav_title.font = [UIFont fontWithName:@"Arial-BoldMT" size:18];
nav_title.textColor = [UIColor whiteColor];
nav_title.adjustsFontSizeToFitWidth = YES;
nav_title.text = title;
self.title = @"";
nav_title.backgroundColor = [UIColor clearColor];
[bar addSubview:nav_title];
[nav_title release];

Answer 2

使用self.navigationItem.titleView = nav_title;而不是将标签添加为子视图。

Answer 3

使用这个：

  UILabel *label = [[UILabel alloc]init];
  [label setBackgroundColor:[UIColor clearColor]];
  [label setTextColor:[UIColor whiteColor]];
  [label setText:self.title];
  label.adjustsFontSizeToFitWidth=YES;
  label.lineBreakMode=UILineBreakModeWordWrap;
  label.numberOfLines=0;
  [label setFont:[UIFont boldSystemFontOfSize:16.0]];
  [self.navigationController.navigationBar.topItem setTitleView:label];
  [label release];

Hope this will help u..!