如何使用NSNotification

Question

在我的應用程序中，有兩個viewControllers作為FirstViewController和DetailViewController 。 點擊表格單元格時，它會導航到DetailViewController 。 在DetailViewController ，我想編輯並重新加載FirstViewController的表視圖

如何使用NSNotification解決此問題？

這是我想要實現NSNotification的方法

-(IBAction) save{
strSelectedText=theTextField.text;

[NSNotificationCenter defaultCenter];
NSNotification* notification = [NSNotification notificationWithName:@"MyNotification" object:self];
[[NSNotificationCenter defaultCenter] postNotification:notification];  

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector (objFirstViewController) name:@"MyNotification" object:nil];



[self.navigationController popViewControllerAnimated:YES];
}

Answer 1

-(void)viewDidLoad {

[NSNotificationCenter defaultCenter];
NSNotification* notification = [NSNotification notificationWithName:@"MyNotification" object:self];
[[NSNotificationCenter defaultCenter] postNotification:notification];  

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector (objFirstViewController) name:@"MyNotification" object:nil];

}


-(IBAction) save{

[[NSNotificationCenter defaultCenter] postNotificationName:MyNotification object:sender];

//this will go to where you implement your selector objFirstViewController.

}

-(void)objFirstViewController:(NSNotification *)notification {

}

Answer 2

從detailViewController發布通知並添加firstViewController作為觀察者。

確保從viewDidUnload中的觀察者列表中刪除fireViewController。

現在您將detailViewController添加為觀察者。