iphone - UI导航栏标题

Question

我正在尝试使用 UILabel 来替换 UINavigationBar 处的标题，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，如何去掉原来的栏标题呢？我没有声明任何 self.title = @"title"，但它总是显示在那里:

如果我这样做 self.title = nil，那么一切都消失了...如何从导航栏中消除这个神秘的标题并只使用我创建的 UILabel。

Answer 1

你为什么不直接做 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];