將變量存儲在屬性列表文件中Cocos2d

Question

我正在編寫一個cocos2d遊戲，在大多數遊戲中，您必須先完成前一級以繼續進入下一級。每個級別都在不同的層（節點）。我想將整數（1-20）存儲到屬性列表中，以便在整個遊戲中保留變量。是的，我一直在搜索互聯網約一個小時，找不到任何東西。

我發現了一個代碼來存儲變量，但我不知道如何正確使用它。

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentPath = [paths objectAtIndex:0]; 
    NSString *path = [documentPath stringByAppendingPathComponent:@"levelscompleted.save"]; 


    NSMutableDictionary* myDict = [[NSMutableDictionary alloc] init]; 


    myDict = [NSKeyedUnarchiver unarchiveObjectWithFile:path]; 
    NSString *nssLevelsCompleted = [myDict objectForKey:@"LevelsCompleted"]; 
    LevelsCompleted = [nssLevelsCompleted intValue]; 

    LevelsCompleted = 445; 


    [myDict setObject:nssLevelsCompleted forKey:@"LevelsCompleted"]; 



    [NSKeyedArchiver archiveRootObject:myDict toFile:path]; 

Answer 1

下面是一些示例代碼，以得到一個想法（使用ARC內存管理）：

- (NSString*) filePath { 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *filePath = [NSString stringWithFormat:@"%@/%@",documentsDirectory,@"myfile.plist"]; 
    return filePath; 
} 

- (void)writeScoreToPlist:(NSInteger)score level:(NSString*)level { 
    NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:[self filePath]];  
    if(plistDict==nil){ 
     plistDict = [[NSMutableDictionary alloc] init];  
    } 
    [plistDict setObject:[NSNumber numberWithInteger:score] forKey:level]; 
    [plistDict writeToFile:[self filePath] atomically: YES]; 
} 

- (NSInteger)readScoreFromPlist:(NSString*)level { 
    NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:[self filePath]]; 
    NSNumber *value = [plistDict objectForKey:level]; 
    return value.integerValue; 
} 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    // Override point for customization after application launch. 

    [self writeScoreToPlist:999 level:@"Level1Highscore"]; 
    NSInteger score = [self readScoreFromPlist:@"Level1Highscore"]; 
    NSLog(@"Achieved score for level 1: %d",score); 

    self.window.backgroundColor = [UIColor whiteColor]; 
    [self.window makeKeyAndVisible]; 
    return YES; 
} 

輸出：

2012-01-29 16:24:30.844 plistTest[23531:f803] Achieved score for level 1: 999