Question

我有这个代码，要求代理打开由URL标识的资源，并希望将此代码放在AppDelegate文件之外，即在不同的文件中：

    -(BOOL)application:(UIApplication *)application
               openURL:(NSURL *)url
     sourceApplication:(NSString *)sourceApplication
            annotation:(id)annotation {

        NSLog(@"url --> %@", url); 
        //Do something...
        return YES;
    }

如果它在AppDelegate中，它可以正常工作，但如果我在另一个文件中有这个方法，它就不会运行。

为了更详细地介绍我使用此方法的原因，需要进行身份验证过程。所以在我的应用程序的某些时候，Safari会打开并提示用户提供一些凭据。然后我使用URL Scheme +一些信息启动我的应用程序，例如myurl://someinfo

Answer 1

似乎使用NSNotificationCenter可能最适合您的要求。

在AppDelegate中使用NSNotificationCenter发布通知

-(BOOL)application:(UIApplication *)application
           openURL:(NSURL *)url
           sourceApplication:(NSString *)sourceApplication
           annotation:(id)annotation
{
    NSLog(@"url --> %@", url);
    // Do something...
    // 1 - Post recieved URL by usig NSNotificationCenter
   [[NSNotificationCenter defaultCenter] postNotificationName:@"APP_LAUNCHED_BY_URL_SCHEMA_NOTIFICATION" object:url];
   return YES;
}

并在您的Custom类（例如：ViewController）中添加以下代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    // 2 - Add observer to the notification name posted from AppDelegate
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appDidLaunchedByURLSchemaNotification:) name:@"APP_LAUNCHED_BY_URL_SCHEMA_NOTIFICATION" object:nil];
}
-(void)appDidLaunchedByURLSchemaNotification:(NSNotification *)notification
{
    // 3 - Here you can get the URL Object posted with notification,you will get this Callback on every launch of your application using Your Custom URL Scheme by other applications.
    NSURL *url = notification.object;
    NSLog(@"url --> %@", url);
}

请记住在自定义类的-dealloc

中删除添加的观察者

-(void)dealloc
{
   [[NSNotificationCenter defaultCenter] removeObserver:self];
}

H2H，享受编码乐趣：）

Answer 2

这与Naresh的答案非常相似，因为来自NSNotificationCenter的所有通知都以相同的方式工作。

基本上，您将为通知选择一个名称（例如：@"NOTIFICACION_NAME"），然后您需要接收该事件的每个对象都将订阅具有该名称的所有通知。

因此，在您的应用代理中，您将发布一个名称为

的通知（例如＆＃34;广播＆＃34;）

-(BOOL)application:(UIApplication *)application
       openURL:(NSURL *)url
       sourceApplication:(NSString *)sourceApplication
       annotation:(id)annotation
{
    // First, create a dictionary with all the data needed to pass.
    NSDictionary *notificationInfo = @{
                                        @"url"               : url,
                                        @"sourceApplication" : sourceApplication,
                                        @"annotation"        : annotation
                                      };
    // Post the notification to all objects that listen to it.
    [[NSNotificationCenter defaultCenter] postNotificationName:@"NOTIFICATION_NAME"
                                                        object:self
                                                      userInfo:notificationInfo];
}

现在，我们需要在您需要的其他文件中捕获通知。所以：

- (instancetype)init {
    self = [super init];
    if ( self ) {

    // Subscribe to the notifications called "NOTIFICATION_NAME"
    // The "object" parameter is nil so we get notification from all objects that post that particular notification name.
    // It could also be [[UIApplication sharedApplication] delegate] to receive notifications only from the app delegate.
    // If you process the event in a UIViewController, do this in viewDidLoad instead of init.
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(openedWithURLScheme:)
                                                 name:@"NOTIFICATION_NAME"
                                               object:nil];
    }
}

- (void)dealloc {
    // Unsubscribe from all notifications at dealloc time. If you don't do this,
    // your app will crash when the app delegate posts the notifications
    // after this particular object was deallocated.
    // If it's a UIViewController, do this in viewDidUnload.
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)openedWithURLScheme:(NSNotification *)notification {
    // The notification was received, so this method is called with the
    // notification object as a parameter. Now we get the dictionary
    // we sent with all the info.
    NSDictionary *notificationInfo = notification.userInfo;

    // Now get the data you need:
    NSURL *url = notificationInfo[@"url"];
    NSString *sourceApplication = notificationInfo[@"sourceApplication"];
    id annotation = notificationInfo[@"annotation"];

    // Do what you need with that info...
}

简单来说：当您的应用代表收到该特定方法时，我们广播（通知）收到的信息给每个＆＃34;＆＃34;听＆＃34; （观察）该特定通知。应该使用NSDictionary。

来完成

有关详细信息，请阅读official documentation at Apple website。

Answer 3

将该代码留在AppDelegate中，而是在另一个类中使用该方法。

在AppDelegate.h中定义全局AppDelegate，如下所示

#define APP_DELEGATE ((AppDelegate *)[[UIApplication sharedApplication] delegate])

执行此操作后，您可以在代码中的任何位置调用AppDelegate.m的方法，如下所示：

[APP_DELEGATE methodYouWantToCall];

要求代理打开由AppDelegate外部的URL标识的资源

3 个答案: