如何在UINavigationController中添加多行标题栏

Question

我试着在UINavigationController中添加一个两行标题栏

我想调整字体大小根据字符串长度自动设置.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;

这对我没用,能帮助我吗？我必须为iPhone和iPad屏幕做这个

Answer 1

只需设置setNumberOfLines: 0的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;

同时降低FontSize的Label.在这种情况下它是12.它看起来像这样:

对于扩展的问题:

只需在以前的代码中进行一些更改 -

[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];

注意:您不能使用adjustsFontSizeToFitWidth:属性UILabel,因为它不适用于setNumberOfLines:0您的情况,您将不得不处理if条件.

这是根据它的集合fontSize的方法.UILabelwidth

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