如何在 UINavigationController 中添加多行标题栏

我尝试在 UINavigationController 中添加两行标题栏

我想根据字符串长度自动调整字体大小。我的字符串最大大小为 60。我尝试通过以下代码实现

UILabel *bigLabel = [[UILabel alloc] init];
bigLabel.text = @"1234567890 1234567890 1234567890 1234567890 1234567890 123456";
bigLabel.backgroundColor = [UIColor clearColor];
bigLabel.textColor = [UIColor whiteColor];
bigLabel.font = [UIFont boldSystemFontOfSize:20];
bigLabel.adjustsFontSizeToFitWidth = YES;
bigLabel.clipsToBounds = NO;
bigLabel.numberOfLines = 2;
bigLabel.textAlignment = ([self.title length] < 10 ? NSTextAlignmentCenter : NSTextAlignmentLeft);
[bigLabel sizeToFit];

self.navigationItem.titleView = bigLabel;

它对我不起作用，你能帮我吗？我必须为 iPhone 和 iPad 屏幕制作这个

刚刚设置setNumberOfLines: 0 of UILabel。请参阅下面的示例。

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0.0, 0.0, 320.0, 44.0)];
[label setBackgroundColor:[UIColor clearColor]];
[label setNumberOfLines:0];
[label setTextColor:[UIColor whiteColor]];
[label setTextAlignment:NSTextAlignmentCenter];
[label setText:@"1234567890 1234567890 1234567890 1234567890 1234567890 123456"];
self.navigationItem.titleView = label;

设置左和右UIBarButtonItems- 您可以添加它们。

UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc]initWithTitle:@"Left" style:UIBarButtonItemStylePlain target:self action:@selector(leftPress:)];
self.navigationItem.leftBarButtonItem = leftBarButton;

UIBarButtonItem *rightBarButton = [[UIBarButtonItem alloc]initWithTitle:@"Right" style:UIBarButtonItemStylePlain target:self action:@selector(rightPress:)];
self.navigationItem.rightBarButtonItem = rightBarButton;

还要减少FontSize of Label. It is 12在这种情况下。 它看起来像这样：

对于扩展问题：

只需对之前的代码进行一些更改即可 -

[label setNumberOfLines:2]; //Set it 2 instead of 0

NSString *titleStr = @"3456456676456464554541223434484384233456744444444456785643367";

//Check your string length then set font according to it.
//I have set font size according to your requirement
//which is 0-60.

if([titleStr length]>40 && [titleStr length]<=52){
    [label setFont:[UIFont fontWithName:@"Arial" size:13.0]];
}
else if([titleStr length]>52){
    [label setFont:[UIFont fontWithName:@"Arial" size:11.5]];
}

[label setText:titleStr];

Note:你不能使用adjustsFontSizeToFitWidth:的财产UILabel，因为它不适用于setNumberOfLines:0在你的情况下你将不得不处理它if健康）状况。

这是设置方法fontSize Of UILabel根据其width.

[label setNumberOfLines:1];
label.adjustsFontSizeToFitWidth = YES;
label.minimumFontSize = 1.0;