我的视图控制器在iPhone XR上看起来很奇怪。我不知道为什么,但这些单词是重复和覆盖的,但不是旧版本。
重复的单词:
我实现了一个搜索栏,并有一个用户名的基本表视图。
以下是我对标签的约束的屏幕截图。
迅速:
class FindFriendsViewController: UIViewController {
var users = [User]()
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
var searchItem = [String]()
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
tableView.tableFooterView = UIView()
tableView.rowHeight = 71
let tap = UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:)))
tap.cancelsTouchesInView = false
self.view.addGestureRecognizer(tap)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
UserService.usersExcludingCurrentUser { [unowned self] (users) in
self.users = users
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
extension FindFriendsViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching {
return searchItem.count
} else {
return users.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "FindFriendsCell") as! FindFriendsCell
// let user = users[indexPath.row]
var usernamesArr = [String]()
for user in users {
usernamesArr.append(user.username)
}
if searching {
cell.textLabel?.text = searchItem[indexPath.row]
} else {
cell.textLabel?.text = usernamesArr[indexPath.row]
cell.delegate = self
configure(cell: cell, atIndexPath: indexPath)
}
return cell
}
func configure(cell: FindFriendsCell, atIndexPath indexPath: IndexPath) {
let user = users[indexPath.row]
cell.usernameLabel.text = user.username
cell.followButton.isSelected = user.isFollowed
}
}
extension FindFriendsViewController: FindFriendsCellDelegate {
func didTapFollowButton(_ followButton: UIButton, on cell: FindFriendsCell) {
guard let indexPath = tableView.indexPath(for: cell) else { return
}
followButton.isUserInteractionEnabled = false
let followee = users[indexPath.row]
FollowService.setIsFollowing(!followee.isFollowed, fromCurrentUserTo: followee) { (success) in
defer {
followButton.isUserInteractionEnabled = true
}
guard success else { return }
followee.isFollowed = !followee.isFollowed
self.tableView.reloadRows(at: [indexPath], with: .none)
}
}
}
extension FindFriendsViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
var usernamesArr = [String]()
for user in users {
usernamesArr.append(user.username)
}
searchItem = usernamesArr.filter({$0.lowercased().prefix(searchText.count) == searchText.lowercased()})
searching = true
tableView.reloadData()
}
}
正如@Prashant Tukadiya所说,textLabel
是UITableViewCell
Outlet,如果你使用自定义单元,你不应该使用它。这就是你应该做的:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "FindFriendsCell") as! FindFriendsCell
var usernamesArr = [String]()
for user in users {
usernamesArr.append(user.username)
}
if searching {
cell.usernameLabel.text = searchItem[indexPath.row]
} else {
cell.delegate = self
cell.usernameLabel.text = usernamesArr[indexPath.row].username
cell.followButton.isSelected = usernamesArr[indexPath.row].isFollowed
}
return cell
}