Swift 'subscript' 的使用不明确

Question

我最近在我的项目中添加了新的 pods 并更新了以前的代码，这段代码之前都有效，现在我得到了 "Ambiguous use of 'subscript'" 我一直在检查其他答案，看起来我目前设置它的方式是正确的方式。我不确定为什么这些代码行会突然被标记为错误。

databaseRef.child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { (postsSnapshot) in
    let posts = postsSnapshot.value as! [String: AnyObject]
    for (_, post) in posts {
        for (_, postInfo) in post as! [String: AnyObject] {

            if let followingID = postInfo["uid"] as? String {
                for each in self.following {
                    if each == followingID {

                        guard let uid = postInfo["uid"] as! String? else {return}
                        guard let name = postInfo["businessName"] as! String? else {return}
                        guard let address = postInfo["businessStreet"] as! String? else {return}
                        guard let state = postInfo["businessState"] as! String? else {return}
                        guard let city = postInfo["businessCity"] as! String? else {return}

                        let data = ["uid":postInfo["uid"] as! String, "businessName":postInfo["businessName"] as! String, "businessStreet":postInfo["businessStreet"] as! String, "businessState":postInfo["businessState"] as! String, "businessCity":postInfo["businessCity"] as! String,"businessZIP":postInfo["businessZIP"] as! String, "businessPhone":postInfo["businessPhone"] as! String, "businessLatitude":postInfo["businessLatitude"] as! String, "businessLongitude":postInfo["businessLongitude"] as! String, "businessWebsite":postInfo["businessWebsite"] as! String, "facebookURL":postInfo["facebookURL"] as! String, "foursquareURL":postInfo["foursquareURL"] as! String, "googleURL":postInfo["googleURL"] as! String, "instagramURL":postInfo["instagramURL"] as! String, "snapchatURL":postInfo["snapchatURL"] as! String, "twitterURL":postInfo["twitterURL"] as! String, "yelpURL":postInfo["yelpURL"] as! String]

Answer 1

问题出在您对 AnyObject 的使用上。 postInfo 被声明为 AnyObject 但你试图像字典一样使用它，因此出现错误。

如果post是一个字典的字典，那么声明是这样的：

变化：

for (_, postInfo) in post as! [String: AnyObject] {

至：

for (_, postInfo) in post as! [String: [String: AnyObject]] {

这会将 postInfo 更改为 [String: AnyObject] 而不是 AnyObject。

Swift 'subscript' 的使用不明确

Swift Ambiguous use of 'subscript'

swift

subscript