如何在app delegate中使用视图控制器中的函数？ [英] How to use a function from the view controller in the app delegate?

问题描述

我有一个通过蓝牙连接到设备的应用。

I have an app that is connected to a device by Bluetooth.

我希望应用程序发送一个命令，指示应用程序将在app委托方法中关闭:( void）applicationWillTerminate：（UIApplication *）application {

I want the app to send a command that indicates that the app is going to close in the app delegate method : (void)applicationWillTerminate:(UIApplication *)application {

推荐答案

一个字： NSNotificationCenter

我不确定您需要将数据设置为什么，因为您无法通过 NSNotificationCenter 无缝传递数据;但无论如何你要在你的 UIApplicationDelegate 中解决这个问题，那么为什么你不能直接在视图控制器中做到这一点。

One word: NSNotificationCenter

I'm not sure what you need to set the data to because you can't pass the data seamlessly via NSNotificationCenter; however you were going to figure that out in your UIApplicationDelegate anyway, so why can't you do it in the view controller directly.

在您的情况下，您的应用程序委托中不需要执行任何，因为此通知允许您的视图控制器充当迷你应用代表（因为你可以获得终止状态等等）。

In your case there is no need to do anything in your application delegate, because this notification allows your view controller to act as a mini app delegate (in that you can get termination status and so on).

因此......

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(TXdata:) name:UIApplicationWillTerminateNotification object:nil];
}

- (void)TXdata:(NSString *) data {
    NSString *newData = data;
    if (newData == nil) {
        newData = ... // Figure out what your data should be here.
    }
    //do whatever with your data here.
}

我引用：

在应用程序即将终止时发布。

UIApplicationWillTerminateNotification

Posted when the app is about to terminate.

此通知是与委托applicationWillTerminate：方法相关联。此通知不包含userInfo字典。

This notification is associated with the delegate applicationWillTerminate: method. This notification does not contain a userInfo dictionary.

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