如何使一個標籤在所有視圖控制器上設置分數？

Question

我有一個標籤，我需要它來顯示比分，在每個視圖控制器硬幣ECT，這意味着，當比分改變它在那裏在整個應用程序的每個變化......

我試圖設置標籤以顯示整個應用程序的分數，但我不知道如何！

請幫

這是我迄今爲止在視圖控制器：

-(void)viewDidLoad 
{ 
{ 
[super viewDidLoad]; 


    NSError *error; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //1 
    NSString *documentsDirectory = [paths objectAtIndex:0]; //2 
    path = [documentsDirectory stringByAppendingPathComponent:@"SettingsList.plist"]; //3 

    NSFileManager *fileManager = [NSFileManager defaultManager]; 

    if (![fileManager fileExistsAtPath: path]) //4 
    { 
     NSString *bundle = [[NSBundle mainBundle] pathForResource:@"SettingsList"ofType:@"plist"]; //5 //5 

     [fileManager copyItemAtPath:bundle toPath: path error:&error]; //6 
    } 

    savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile: path]; 

    nPoint = [[savedStock objectForKey:@"point"] intValue]; 
    [giftAmount setText:[NSString stringWithFormat:@"%d",nPoint]]; 

[self updateCurrencyBalance]; 
[self zoneLoading]; 
} 

//adcolony 
- (void) viewDidAppear:(BOOL)animated 
{ 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateCurrencyBalance) name:kCurrencyBalanceChange object:nil]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(zoneReady) name:kZoneReady object:nil]; 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(zoneOff) name:kZoneOff object:nil]; 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(zoneLoading) name:kZoneLoading object:nil]; 
} 

// Get currency balance from persistent storage and display it 
- (void)updateCurrencyBalance { 
NSNumber* wrappedBalance = [[NSUserDefaults standardUserDefaults] objectForKey:kCurrencyBalance]; 
NSUInteger balance = wrappedBalance && [wrappedBalance isKindOfClass:[NSNumber class]] ? [wrappedBalance unsignedIntValue] : 0; 
[giftAmount setText:[NSString stringWithFormat:@"%u", balance]]; 

[savedStock setObject:[NSNumber numberWithFloat:nPoint = balance] forKey:@"point"]; 
[savedStock writeToFile: path atomically:YES]; 

} 

我在其他PlayViewController這（minusus）動作-200硬幣，但它沒有更新中ViewController？

Answer 1

一種方法是使用NSNotificationCenter。

這個代碼添加到改變你的分數的值的所有地方：

- (void)updateScore:(NSNumber *)newValue 
    // update the score 
    self.score = newValue; 

    // create an dictionary object containing the score to be sent with the notification 
    NSMutableDictionary* userInfo = [NSMutableDictionary dictionary]; 
    [userInfo setObject:self.score forKey:@"score"]; 

    // Add this to send a notification to all the listeners in the whole app 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"NotificationScoreChanged" object:nil userInfo:userInfo]; 
} 

在您的視圖控制器的viewDidLoad方法，添加以下代碼：在某處

- (void)viewDidLoad:(BOOL)animated 
{ 
    [super viewDidLoad:animated]; 

    // Add this code to start receiving notifications (become a listener) 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(scoreChanged:) name:@"NotificationScoreChanged" object:nil]; 
} 

然後你視圖控制器，添加此方法來更新您的用戶界面：

- (void)scoreChanged:(NSNotification *)notification 
{ 
    // retrieve the score results 
    if ([notification.name isEqualToString:@"NotificationScoreChanged"]) 
    { 
     NSDictionary *userInfo = notification.userInfo; 
     NSNumber *score = [userInfo objectForKey:@"score"]; 

     // and update your labels 
     self.scoreLabel.text = [score description]; 
    } 

而在你的視圖控制器，添加的dealloc：

- (void)dealloc 
{ 
    //Unregister yourself (stop listening) 
    [[NSNotificationCenter defaultCenter] removeObserver:self]; 
} 

注意：你應該取決於你如何存儲和檢索你的分數適應的代碼。也就是說，如果您使用NSUserDefaults（請參閱@ erid的答案），CoreDate等。

Answer 2

使用NSUserDefaults存儲數據（只有當程序從iOS設備中刪除或者您可以手動刪除時纔會刪除數據）。在NSUserDefaults的

儲值

//text is your label.text, and each time you change it, save it to user details 
NSString *text; 

//Store them to NSUserDefaults with a specific key 
[[NSUserDefaults standardUserDefaults] setObject:text forKey:@"label"]; 

獲得值回

NSString *textValue = [[NSUserDefaults standardUserDefaults] objectForKey:@"label" ]; 
label.text = textValue; 

你可以嘗試添加NSNotification到你的程序時NSString設置更改標籤更改notificate你，有你可以將此值設置爲NSUserDefaults。

正如大衛說，這不是要做到這一點的最好辦法，但你要了解更多關於單身，如果你需要保存DATA，直到應用程序被關閉。

希望它有幫助