updateSearchResults 方法中 didSelectRow 的索引超出范围
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【中文标题】updateSearchResults 方法中 didSelectRow 的索引超出范围【英文标题】:index out of range on didSelectRow in updateSearchResults method 【发布时间】:2020-03-27 10:22:58 【问题描述】:我在另一个视图控制器中将用户配置文件显示为搜索结果,以便在选择单元格时用户会被关注。我从 updateSearchResults 方法加载结果,它加载得很好,但是当我选择要关注该用户的行时,有时它会抛出一个错误,致命错误:索引超出范围。
我的代码:
func updateSearchResults(for searchController: UISearchController)
self.chooseResultsTableController.reloadData()
let ref = Database.database().reference()
let queryRef : DatabaseQuery
let lastUser = self.resultsUsers.last
guard searchController.searchBar.text != "" else
return
queryRef = ref.child("users").queryOrdered(byChild: "full Name").queryStarting(atValue: searchController.searchBar.text).queryEnding(atValue: searchController.searchBar.text!+"\uf8ff").queryLimited(toLast: 20)
SVProgressHUD.show()
var tempUsers2 = [user]()
queryRef.observeSingleEvent(of: .value, with: snapshot in
for snap in snapshot.children
let userSnap = snap as! DataSnapshot
let userKey = userSnap.key
let userDict = userSnap.value as! [String:AnyObject]
let aUser = user()
aUser.fullName = userDict["full Name"] as? String
let joinedSince = userDict["dateJoined"] as! Double
aUser.ImagePath = userDict["urlToImage"] as? String
aUser.about = userDict["about"] as? String
if let FollowingCount = userDict["followers"] as? [String : String]
aUser.followers = FollowingCount.values.count
aUser.userId = userKey
let sensibleDate = joinedSince / 1000
let date = Date(timeIntervalSince1970: sensibleDate)
var finalString = String()
let secondsAgo = Int(Date().timeIntervalSince(date))
let minute = 60
let hour = 60 * minute
let day = 24 * hour
let week = 7 * day
if secondsAgo < minute
// finalString = "\(secondsAgo) Just now"
finalString = "Just now"
else if secondsAgo < hour
finalString = "\(secondsAgo / minute) minutes ago"
else if secondsAgo < day
finalString = "\(secondsAgo / hour) hours ago"
else if secondsAgo < week
finalString = "\(secondsAgo / day) days ago"
else
finalString = "\(secondsAgo / week) weeks ago"
aUser.joinedSince = finalString
aUser.untouchedDate = joinedSince
if userKey != lastUser?.userId
tempUsers2.insert(aUser, at: 0)
print(tempUsers2)
// self.users.removeAll()
print("\(self.resultsUsers.count) number of users")
SVProgressHUD.dismiss()
self.resultsUsers = tempUsers2
self.chooseResultsTableController.reloadData()
)
此外,当我使用不同的关键字搜索以使表格视图数据发生变化时,在单元格上选择时似乎可以保证错误:(
错误代码:
func checkFollowing(indexPath : IndexPath)
let uid = Auth.auth().currentUser?.uid
let ref = Database.database().reference()
ref.child("users").child(uid!).child("following").queryOrderedByKey().observe(.value) (snapshot) in
if let following = snapshot.value as? [String : AnyObject]
for (_ , value) in following
if value as? String == self.resultsUsers[indexPath.row].userId
self.chooseResultsTableController.cellForRow(at: indexPath)?.accessoryType = .checkmark
【问题讨论】:
添加出现错误的代码 @Toto 添加了我收到错误的代码 你需要安全来打开你的选项以避免崩溃。检查这个答案***.com/questions/25195565/… @Toto 我在更正选项后尝试运行,但仍然出现该错误 您得到索引超出范围,请先尝试检查数组是否具有该索引,然后再访问它。检查 index 【参考方案1】:该错误意味着您尝试访问的数组元素不存在。例如,如果您的数组大小为 4,您尝试访问数组 [10]。 我不知道你到底是在哪里让它发生的。但是您应该在更改数据源数组大小的任何地方重新加载 tableview 数据
【讨论】:
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