如何在 UINavigationController 中添加多行标题栏 [英] How to add a multiline title bar in UINavigationController

问题描述

我尝试在 UINavigationController 中添加两行标题栏

I have try to add a two line title bar in UINavigationController

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变为60.我尝试通过以下代码实现

I want to adjust font size automatically set according to string length.My String max size goes to 60. I have try to implemented through following code

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;

这对我不起作用，请你帮帮我.我必须为 iPhone 和 iPad 屏幕制作这个

It didn't work for me can you help me please. I have to made this for iPhone and iPad screen

推荐答案

只需设置 UILabel 的 setNumberOfLines: 0.请参阅下面的示例.

Just set setNumberOfLines: 0 of UILabel. See the example below.

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 - 你可以添加它们.

Set Left and Right UIBarButtonItems - you can add them.

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;

同时减小Label的FontSize.在这种情况下是 12.它看起来像这样:

Also decrease the FontSize of Label. It is 12 in this case. And it will look like this:

关于扩展问题:

只需对之前的代码进行一些更改 -

Just make some changes in previous code -

[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 UILabel 的 adjustsFontSizeToFitWidth: 属性，因为它不适用于 setNumberOfLines:0 在您的情况下，您将不得不使用 if 条件来处理它.

Note: You can't use adjustsFontSizeToFitWidth: property of UILabel, because it doesn't work for setNumberOfLines:0 in your case you will have to handle it with if condition.

这是根据width设置fontSize的UILabel的方法.

This is method for set fontSize Of UILabel according to its width.

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

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