如何在Swift 3中更新字典密钥 if（userfollowArray[indepath.row][“watcher\u following”]as！Bool）=false{ 让dict:NSMutableDictionary=userfollowArray[indexPath.row]作为！NSMutableDictionary 打印（dict） dict[“观察者”]=1 self.userfollowerArray[indexPath.row]=dict as！Dictionary }

我想用

true/false

更新

watcher\u following

键，但它会引发异常

[\u TtGCs26\u迅捷延迟词典sp__ _swift_setObject:forKeyedSubscript:：发送到实例的选择器无法识别

---

声明

var

对于可变类型，

let

仅适用于不可变/常量类型。不需要使用objective c

NSMutableDictionary

type

if (userFollowingArray[indexPath.row]["watcher_following"] as! Bool) == false {
    let dict : NSMutableDictionary = userFollowingArray[indexPath.row] as! NSMutableDictionary
    print(dict)
    dict["watcher_following"] = 1
    self.userFollowingArray[indexPath.row] = dict as! Dictionary<String, Any>
}

if dict[“watcher\u following”]as！Bool==false{
var dict:Dictionary=userfollowArray[indexPath.row]as！Dictionary
dict[“观察者”]=1
self.userfollowerArray[indexPath.row]=dict as！Dictionary
}

不要在Swift中使用

NSMutable…

集合类型

• 将

  userfollowerarray

  声明为Swift数组

  if dict["watcher_following"] as! Bool == false {
      var dict : Dictionary<String, Any> = userFollowingArray[indexPath.row] as! Dictionary<String, Any>
      dict["watcher_following"] = 1
      self.userFollowingArray[indexPath.row] = dict as! Dictionary<String, Any>
  }
  

• 将

  字典

  作为

  var

  iable获取

  var userFollowingArray = [[String:Any]]()
  

• 检查值

  var dict = userFollowingArray[indexPath.row]
  

• 如有必要，请进行更新，并将字典分配回数组

  if dict["watcher_following"] as! Bool == false {
  

  由于值语义，最后一步是必需的

---

使用自定义结构或类比使用字典方便得多。

将

let dict

更改为

var dict

，然后尝试使用它？为什么在var中使用NSMutableDictionary而不是Swift dictionary？为什么要强制铸造一切？这是Swift，但它看起来更像Objective-C而不是Swift 3…现在它可以工作了，谢谢

    dict["watcher_following"] = true
    userFollowingArray[indexPath.row] = dict
}