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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:

- (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 …