我试图使用与iOS 11和Swift 4的Lyft API,并在第二行收到错误,这是
重叠访问'urlComponents',但修改需要独占访问; 考虑复制到局部变量.
我不确定这意味着什么,以及如何绕过它.任何帮助表示赞赏,谢谢!
let queryItems = parameters
.sorted { $0.0 < $1.0 }
.flatMap { components(forKey: $0, value: $1) }
var urlComponents = URLComponents(url: mutableURLRequest.url!, resolvingAgainstBaseURL: false)
urlComponents?.queryItems = (urlComponents?.queryItems ?? []) + queryItems //error here
Run Code Online (Sandbox Code Playgroud) 我试图建立一个表视图,该视图将根据顶部的分段控制器来更改单元格。但是,在尝试重新加载tableview时尝试更改单元格时,实际上我有一个return函数时,我收到了return函数错误。我该怎么做才能解决此问题?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if friendSelector.selectedSegmentIndex == 0 {
print("0")
cell = self.friendsTable.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FriendsTableViewCell
cell.nameLabel.text = friends[indexPath.row]
cell.bacLabel.text = String(friendsBac[indexPath.row])
cell.statusImageView.image = friendsImage[indexPath.row]
return cell
}
if friendSelector.selectedSegmentIndex == 1 {
print("1")
celladd = self.friendsTable.dequeueReusableCell(withIdentifier: "celladd", for: indexPath) as! FriendsAddTableViewCell
celladd.nameLabel.text = requested[indexPath.row]
celladd.statusImageView.image = UIImage(named: "greenlight")
return celladd
}
}
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我在尝试配置原型单元以与几个阵列一起使用时遇到了一个奇怪的错误.我已经设置了一个由'BDTableViewController'控制的表视图控制器,并包含一个由'BDTableViewCell'类控制的原型单元.然而,Xcode抱怨说
'UITableViewCell'没有名为'businessLabel'的成员
当businessLabel出口明确链接到我的BDTableViewCell时.包括文件本身.什么是错的?

BDTableViewController:
import UIKit
class BDTableViewController: UITableViewController, UITableViewDelegate {
var BusinessNameArray = [String]()
var BusinessLogoArray = [String]()
var BusinessAddressArray = [String]()
var BusinessNumberArray = [String]()
var BusinessWebsiteArray = [String]()
override func viewDidLoad() {
super.viewDidLoad()
BusinessNameArray = ["Premiere Dance"]
BusinessLogoArray = ["PD.tiff"]
BusinessAddressArray = ["30 Brower Lane, Hillsborough, NJ 08844"]
BusinessNumberArray = ["(908) 281-9442"]
BusinessWebsiteArray = ["http://premieredancenj.com/"]
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can …Run Code Online (Sandbox Code Playgroud)