[英]Send a notification from AppDelegate to ViewController
need your help. 需要你的帮助。 I implement these Delegate Method to the AppDelegate.m:
我将这些Delegate方法实现到AppDelegate.m:
-(BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
if (url != nil && [url isFileURL]) {
//Valid URL, send a message to the view controller with the url
}
else {
//No valid url
}
return YES;
But now, I need the URL not in the AppDelegate but in my ViewController. 但是现在,我需要的URL不在AppDelegate中,而在ViewController中。 How I can "send" them the url or how I can implement these Delegate Method to the ViewController?
我如何“发送” URL或如何将这些Delegate方法实现到ViewController?
you can use NSNotificationCenter
as shown below: 您可以使用
NSNotificationCenter
,如下所示:
Firstly post Notification in your app delegate as : 首先在您的应用程序委托中将Notification发布为:
NSDictionary *_dictionary=[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSString stringWithFormat:@"%d",newIndex],nil] forKeys:[NSArray arrayWithObjects:SELECTED_INDEX,nil]];
[[NSNotificationCenter defaultCenter] postNotificationName:SELECT_INDEX_NOTIFICATION object:nil userInfo:_dictionary];
then register the ViewController you want to observe this notification as 然后将您要观察此通知的ViewController注册为
/***** To register and unregister for notification on recieving messages *****/
- (void)registerForNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(yourCustomMethod:)
name:SELECT_INDEX_NOTIFICATION object:nil];
}
/*** Your custom method called on notification ***/
-(void)yourCustomMethod:(NSNotification*)_notification
{
[[self navigationController] popToRootViewControllerAnimated:YES];
NSString *selectedIndex=[[_notification userInfo] objectForKey:SELECTED_INDEX];
NSLog(@"selectedIndex : %@",selectedIndex);
}
call this method in ViewDidLoad as : 在ViewDidLoad中将此方法称为:
- (void)viewDidLoad
{
[self registerForNotifications];
}
and then on UnLoad remove this observer by calling this method : 然后在UnLoad上通过调用以下方法删除此观察器:
-(void)unregisterForNotifications
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:SELECT_INDEX_NOTIFICATION object:nil];
}
-(void)viewDidUnload
{
[self unregisterForNotifications];
}
Hope it helps you. 希望对您有帮助。
You can post a local notification like this, where notification name will be used by the receiver to subscribe. 您可以像这样发布本地通知,接收者将在其中使用通知名称进行订阅。
[[NSNotificationCenter defaultCenter]
postNotificationName:@"Data"
object:nil];
And in your viewController subscribe the notification. 并在您的viewController中订阅通知。
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(getData:)
notificationName:@"Data"
object:nil];
- getData:(NSNotification *)notification {
NSString *tappedIndex = [[_notification userInfo] objectForKey:@"KEY"];
}
For More About the NSNotificationCenter Can go with this link 有关NSNotificationCenter的更多信息, 可以使用此链接
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