按下 UINavigationController 的后退栏按钮时执行操作 [英] Execute action when back bar button of UINavigationController is pressed
本文介绍了按下 UINavigationController 的后退栏按钮时执行操作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要执行一个动作(清空一个数组),当一个UINavigationController
的后退按钮被按下,而按钮仍然导致之前的ViewController
在栈上出现.我怎么能用 swift 来完成这个?
I need to execute an action (emptying an array), when the back button of a UINavigationController
is pressed, while the button still causes the previous ViewController
on the stack to appear. How could I accomplish this using swift?
推荐答案
一种选择是实现您自己的自定义后退按钮.您需要将以下代码添加到 viewDidLoad 方法中:
One option would be implementing your own custom back button. You would need to add the following code to your viewDidLoad method:
- (void) viewDidLoad {
[super viewDidLoad];
self.navigationItem.hidesBackButton = YES;
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(back:)];
self.navigationItem.leftBarButtonItem = newBackButton;
}
- (void) back:(UIBarButtonItem *)sender {
// Perform your custom actions
// ...
// Go back to the previous ViewController
[self.navigationController popViewControllerAnimated:YES];
}
更新:
这是 Swift 的版本:
Here is the version for Swift:
override func viewDidLoad {
super.viewDidLoad()
self.navigationItem.hidesBackButton = true
let newBackButton = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.Bordered, target: self, action: "back:")
self.navigationItem.leftBarButtonItem = newBackButton
}
func back(sender: UIBarButtonItem) {
// Perform your custom actions
// ...
// Go back to the previous ViewController
self.navigationController?.popViewControllerAnimated(true)
}
更新 2:
这是 Swift 3 的版本:
Here is the version for Swift 3:
override func viewDidLoad {
super.viewDidLoad()
self.navigationItem.hidesBackButton = true
let newBackButton = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.plain, target: self, action: #selector(YourViewController.back(sender:)))
self.navigationItem.leftBarButtonItem = newBackButton
}
func back(sender: UIBarButtonItem) {
// Perform your custom actions
// ...
// Go back to the previous ViewController
_ = navigationController?.popViewController(animated: true)
}
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