ios - 尝试从 plist 中读取整数会导致意外结果

Question

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

    NSFileManager *fileManager = [NSFileManager defaultManager];

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

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

    NSMutableDictionary *levels = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
    NSMutableArray *playLevel = (NSMutableArray *)[levels objectForKey: @"0"];


    // Initialize the correct grid for answer checking.
    correctGrid = [[NSMutableArray alloc] init];
    for (int row = 0; row < 5; row++) {
        NSMutableArray* subArr = [[NSMutableArray alloc] init];
        for (int col = 0; col < 5; col++) {
            int index = row * 5 + col;
            int number = [playLevel objectAtIndex:index];
            NSNumber *item = [NSNumber numberWithInt: number];
            [subArr addObject:item];
        }
        [correctGrid addObject: subArr];
    }

我是 Objective-C 的新手，我正在尝试从结构为数组字典的 plist 中读取整数值。在 xcode 中使用断点/调试器显示 plist 已成功读取。然而，当我尝试从数组 playLevel 中检索数字时，每个数字都是一些高得离谱的整数，例如 164911184，而数组全是零。这和指针有关系吗？感谢帮助。

Answer 1

plist 不能存储整数，它存储 NSNumber。因此，最有可能的是，您可以更改这两行，

int number = [playLevel objectAtIndex:index];
NSNumber *item = [NSNumber numberWithInt: number];

到，

NSNumber *item = [playLevel objectAtIndex:index];