核心数据保存问题:无法更新可转换属性(NSArray)

NSMutableArray *mutableArray = [NSMutableArray arrayWithArray:originalArray];
[mutableArray addObject:newObject];

let newArray = originalArray.map { item in
    // 转换或处理item
    return newItem
}

var array: [Any] = [1, 2, 3]
array.append(4)
array[0] = 0

[array addObserver:self forKeyPath:@"self" options:NSKeyValueObservingOptionNew context:nil];

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if ([keyPath isEqualToString:@"self"]) {
        // 数组已更改
    }
}