寫數據到Plist

Question

我有plist包含字典說dict和字典我有3個數組的鍵A，B，C。現在我想在特定情況下在A，B和C中添加一個項目。爲此我這樣做...

NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES); 
    NSString *documentsDirectory = [path objectAtIndex:0]; 
    NSString *plistPath = [documentsDirectory stringByAppendingString:@"MovingChecklist.plist"]; 
    NSFileManager *fileManager = [NSFileManager defaultManager]; 
    NSError *error; 
    if (![fileManager fileExistsAtPath: plistPath]) 
    { 
     NSString *bundle = [[NSBundle mainBundle] pathForResource:@"MovingChecklist" ofType:@"plist"]; 
     [fileManager copyItemAtPath:bundle toPath: plistPath error:&error]; 
    } 
    NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath]; 
    NSArray *array1 = [dict objectForKey:@"A"]; 
    NSArray *array2 = [dict objectForKey:@"B"]; 
    NSArray *array3 = [dict objectForKey:@"C"]; 

    NSMutableArray *myArray; 
    if (currentMovingList == KMovingListTypeA) { 
     myArray = [NSMutableArray arrayWithArray:array1]; 
     [myArray addObject:nameTextView.text]; 
     [dict setValue:myArray forKey:@"A"]; 

    } 
    if (currentMovingList == KMovingListTypeB) { 
     myArray = [NSMutableArray arrayWithArray:array2]; 
     [myArray addObject:nameTextView.text]; 
     [dict setValue:myArray forKey:@"B"]; 
    } 
    if (currentMovingList == KMovingListTypeC) { 
     myArray = [NSMutableArray arrayWithArray:array3]; 
     [myArray addObject:nameTextView.text]; 
     [dict setValue:myArray forKey:@"C"]; 
    } 
[dict writeToFile:plistPath atomically: YES]; 

但是plist沒有改變。建議我在做什麼錯誤。

Answer 1

我想你應該設置這個作爲可變

NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];