iOS栏按钮项中的动态文本

Question

我想将动态文本放在一个条形按钮项目中，类似于纽约时代对其评论数量的影响，如下图所示。

关于如何实现此功能的任何想法？

Answer 1

我认为关键是UIBarButtonItem的{​​{3}}方法。 这是伪代码，根据您的需要进行修改：

UICustomViewController *customVC = [[UICustomViewController alloc] initWithNibName:@"UICustomViewController" bundle:nil];
[customVC loadView];  //load the views, so your views won't be nil
[customVC updateText];
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:customVC.view];
[[self navigationItem] setRightBarButtonItem:barButtonItem];

Answer 2

创建UIButton并将其分配给导航栏右栏按钮Item。每当有更新时，都会更改按钮文本。我使用导航控制器和导航栏顶部的自定义按钮创建了一个示例项目test该功能

    //Create a button and assign it as rightbarbutton Item.
self.customButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 70, 40)];
self.customButton.titleLabel.textColor=[UIColor whiteColor];
 [self.customButton setTitle:@"0" forState:UIControlStateNormal];
self.customButton.backgroundColor=[UIColor blueColor];
self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc]initWithCustomView:self.customButton];


//Display some random number on navigation bar button
NSString *randomNumber=[NSString stringWithFormat:@"%u",arc4random_uniform(1000)];
[self.customButton setTitle:randomNumber forState:UIControlStateNormal];

您可以从here

下载示例项目