问题描述
我正在尝试从JSON内容(在我的data.swift文件中)获取一些数据并将其分配给comments。任何人都知道这里出了什么问题以及如何解决它?看起来像是一个我遇到问题的语法问题。
I'm trying to get some data from a JSON content(in my data.swift file) and assign it to "comments". Anyone know whats going wrong here and how I can fix it? Seems like a syntax issue that I'm having trouble with.
我得到的错误:
The error I am getting:
import UIKit
class CommentsTableViewController: UITableViewController {
var story = [String:AnyObject]()
var comments = [String:AnyObject]()
override func viewDidLoad() {
super.viewDidLoad()
comments = story["comments"]
tableView.estimatedRowHeight = 140
tableView.rowHeight = UITableViewAutomaticDimension
}
它不喜欢 comments = story [注释]
part。
推荐答案
您的代码中有错误,但错误消息是您由于Swift编译器错误,我看到的是不正确和误导。实际的错误消息应为: AnyObject不能转换为[String:AnyObject]
。
There is an error in your code, but the error message you're seeing is incorrect and misleading due to a Swift compiler bug. The actual error message should read: AnyObject is not convertible to [String:AnyObject]
.
self.story [comments]
返回 AnyObject
。要将该值分配给 self.comments
,您必须首先将 AnyObject
强制转换为字典类型 [字符串:AnyObject]
。
self.story["comments"]
returns an AnyObject
. To assign that value to self.comments
you must first typecast AnyObject
to the Dictionary type [String:AnyObject]
.
例如:
self.comments = self.story["comments"] as! [String:AnyObject]
这篇关于无法使用索引类型为“String”的类型'[String:AnyObject]'下标值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!