如何根据TitleView中文本的长度设置UINavigationBar的高度？

我已经设置了UINavigationBar titleView，如下所示：

UIView *labelView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 255, 40)]; UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 200, 40)]; [label setTextColor:[UIColor whiteColor]]; label.lineBreakMode=UILineBreakModeWordWrap; label.numberOfLines=0; label.shadowColor = [UIColor colorWithRed:0.0f/255.0f green:0.0f/255.0f blue:0.0f/255.0f alpha:0.25f]; label.shadowOffset = CGSizeMake(0.0f, -1.0f); label.textAlignment = UITextAlignmentCenter; label.adjustsFontSizeToFitWidth=YES; [label setBackgroundColor:[UIColor clearColor]]; switch (genreId) { case 1: label.text=@"Music"; self.navigationItem.titleView =label; break; case 3: label.text=@"Family"; break; case 6: label.text=@"Literature"; break; case 7: label.text=@"Theatre"; break; default: label.frame=CGRectMake(0, 0, 255, 40); label.text=ArtistName; break; } [label setFont:[UIFont boldSystemFontOfSize:20.0]]; [labelView addSubview:label]; [self.navigationItem setTitleView:labelView]; [label release]; 

现在我想更新UINavigationBar的高度，因为在我们增加UINavigationBar的高度之前，标题视图中的自动换行不会显示。我可以这样做吗？

Answer 1

使用这个代码……并且冷静……

 NSString *summary; summary = @" your title"; // define font size what ever you want.... CGSize s = [summary sizeWithFont:[UIFont systemFontOfSize:30] constrainedToSize:CGSizeMake(self.view.bounds.size.width - 40, MAXFLOAT) // - 40 For cell padding lineBreakMode:UILineBreakModeWordWrap]; CGRect frame = CGRectMake(0.0f, 0.0f, 320.0f, s.height); [self.navigationController.navigationBar setFrame:frame]; 

希望，它会帮助你……

Answer 2

我认为您必须使用自定义图像创建自定义UINavigationBar，然后您可以执行任何操作。

Answer 3

尝试这个，

 @implementation UINavigationBar (CustomHeight) - (void)layoutSubviews { [super layoutSubviews]; CGRect barFrame = self.frame; barFrame.size.height = height; self.frame = barFrame; } @end