无法在 UINavigationBar 上拖动导航项

Question

我无法将导航项拖到我的 UINavigationBar 上。它只允许我拖动一个条形按钮项目。有没有办法以编程方式添加后退按钮？谢谢

Answer 1

添加按钮很简单

UIBarButtonItem *barBtn = [[UIBarButtonItem alloc]init];
self.navigationItem.leftBarButtonItem=barBtn;

更改标题和属性只需使用

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:self.navigationItem.backBarButtonItem.style target:nil action:nil];

Answer 2

在 viewDidLoad 中添加这个

UIBarButtonItem *backButton = [[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(backAction:)];
self.navigationItem.leftBarButtonItem = backButton;

并实施 backAction，

-(void)backAction
{
      [self.navigationController popViewControllerAnimated:YES];
}