NSMutableArray : 无法识别的选择器发送到实例 [英] NSMutableArray : unrecognized selector sent to instance

问题描述

我正在尝试使用 NSMutableArray 的 NSMutableArray 存储数组 int[9][9]，其中我存储了数组中的 81 个整数:

I'm trying to store an array int[9][9] with a NSMutableArray of NSMutableArray where I store my 81 integers from the array :

- (void)awakeFromNib {
    // initialization matrix
    for (int i = 0; i < 9; i++) {
        for (int j = 0; j < 9; j++) {
            matrix[i][j] = 0;
        }
    }

        // Creating NSMutableArray instance
    TGrid = [NSMutableArray arrayWithCapacity:10];

    [self saveGrid];
}

- (void)saveGrid {
    NSNumber *aInt;
    NSMutableArray *Grid = [NSMutableArray arrayWithCapacity:81];
    for (int i = 0; i < 9; i++) {
        for (int j = 0; j < 9; j++) {
            aInt = [NSNumber numberWithInt:matrix[i][j]];
            [Grid addObject:aInt];
        }
    }
    [TGrid addObject:Grid];
}

- (IBAction)undo:(id)sender {
    [TGrid removeLastObject];
    NSMutableArray *Grid = [TGrid lastObject];
    for (int i = 0; i < 9; i++) {
        for (int j = 0; j < 9; j++) {
            matrix[8-i][8-j] = [[Grid lastObject] intValue];
            [Grid removeLastObject];
        }
    }
}

当 saveGrid 第一次被awakeFromNib 方法调用时，它起作用了.但是当我更改矩阵时，它再次调用 saveGrid，这次我收到此错误:

When saveGrid is first called by the awakeFromNib method, it works. But when I change my matrix, it calls again saveGrid, and this time I get this error :

* 由于未捕获的异常而终止应用'NSInvalidArgumentException'，原因:'-[CALayerArray addObject:]:无法识别的选择器发送到实例0x4b36ce0'

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CALayerArray addObject:]: unrecognized selector sent to instance 0x4b36ce0'

我需要你的帮助！谢谢！

I need your help ! Thanks !

推荐答案

你需要保留 TGrid ！否则，它会被自动释放池解除分配，并且可能会有一个 CALayer 在内存中占据它的位置！

You need to retain TGrid ! Otherwise, it will be deallocate by the autorelease pool and probably a CALayer takes its place in the memory !

最好的选择是创建一个带有保留属性的属性并访问 self.TGrid最后别忘了释放(dealloc)

Best option being to create a property with retain attribute out of it and access self.TGrid Don't forget to release it at the end (dealloc)

编辑它被释放是因为每个实例创建者类方法都提供了 Autoreleased 实例(这是每个人都应该遵循的规则，Apple 在整个 SDK 中都遵循).

edit It is deallocated because every instance creator class method provides Autoreleased instance (that's a rule that everyone should follow and that Apple does follow in the whole SDK).

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