当搜索栏成为第一响应者时更改表格 - swift
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【中文标题】当搜索栏成为第一响应者时更改表格 - swift【英文标题】:Change table when search bar becomes first responder - swift 【发布时间】:2017-07-11 01:14:06 【问题描述】:您好,当搜索栏成为第一响应者时,我正在尝试更改表格中的单元格。理想情况下,我希望我的添加朋友表最初显示朋友请求,当搜索栏成为第一响应者时,它将更改单元格以显示在搜索栏中键入的内容的搜索结果。这是我当前的代码:
class UserFriendRequestController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate
let titleCell = "titleCell"
let cellId = "cellId"
let contactSearch = "contactSearch"
var searchBar = UISearchBar()
var addFriendsTable: UITableView = UITableView()
let users = NSMutableArray()
override func viewDidLoad()
super.viewDidLoad()
view.addSubview(addFriendsTable)
let img = UIImage(named: "white-screen")
self.navigationController?.navigationBar.shadowImage = img
self.navigationController?.navigationBar.setBackgroundImage(img, for: UIBarMetrics.default)
navigationItem.title = "Add Contact"
self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Nunito", size: 18.5)!, NSForegroundColorAttributeName: UIColor(r: 86, g: 214, b: 209)]
addFriendsTable.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height - (70))
addFriendsTable.delegate = self
addFriendsTable.dataSource = self
searchBar.sizeToFit()
searchBar.searchBarStyle = .minimal
searchBar.placeholder = "Search Conctacts"
searchBar.showsCancelButton = true
searchBar.delegate = self
addFriendsTable.tableHeaderView = searchBar
addFriendsTable.contentOffset = CGPoint(x: 0.0, y: 0.0)
UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).setTitleTextAttributes([NSFontAttributeName : UIFont(name: "Nunito", size: 15)!, NSForegroundColorAttributeName : UIColor(r: 78, g: 78, b: 78)
], for: .normal)
var image = UIImage(named: "back_button_thick")
image = image?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style: .plain, target: self, action: #selector(handleBack))
addFriendsTable.register(UserFriendRequestsCell.self, forCellReuseIdentifier: cellId)
addFriendsTable.register(FriendRequestsTitleCell.self, forCellReuseIdentifier: titleCell)
addFriendsTable.register(AddFriendRequestCell.self, forCellReuseIdentifier: contactSearch)
addFriendsTable.separatorColor = UIColor(r: 225, g: 225, b: 225)
setup()
func setup()
for i in 1 ..< 20
let user = User()
users.add(user)
func searchBarCancelButtonClicked(_ searchBar: UISearchBar)
searchBar.text = nil
searchBar.resignFirstResponder()
func handleBack()
dismiss(animated: true, completion: nil)
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
return 10
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
if self.searchBar.isFirstResponder
let cell = tableView.dequeueReusableCell(withIdentifier: contactSearch, for: indexPath) as! AddFriendRequestCell
cell.selectionStyle = UITableViewCellSelectionStyle.none
cell.textLabel?.text = "Instagram User Name"
cell.textLabel?.font = UIFont(name: "Nunito", size: 16)
cell.textLabel?.textColor = UIColor(r: 51, g: 51, b: 51)
cell.detailTextLabel?.text = "Instagram Handle"
cell.detailTextLabel?.font = UIFont(name: "Nunito", size: 13)
cell.detailTextLabel?.textColor = UIColor.darkGray
cell.profileImageView.image = UIImage(named: "profilepic")
cell.separatorInset.left = CGFloat(55)
cell.separatorInset.right = CGFloat(5)
let user = users[indexPath.row] as! User
cell.configure(user: user)
return cell
else
if indexPath.row == 0
let cell = tableView.dequeueReusableCell(withIdentifier: titleCell, for: indexPath) as! FriendRequestsTitleCell
cell.selectionStyle = UITableViewCellSelectionStyle.none
return cell
else
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! UserFriendRequestsCell
cell.selectionStyle = UITableViewCellSelectionStyle.none
cell.textLabel?.text = "Instagram User Name"
cell.textLabel?.font = UIFont(name: "Nunito", size: 16)
cell.textLabel?.textColor = UIColor(r: 51, g: 51, b: 51)
cell.detailTextLabel?.text = "Instagram Handle"
cell.detailTextLabel?.font = UIFont(name: "Nunito", size: 13)
cell.detailTextLabel?.textColor = UIColor.darkGray
cell.profileImageView.image = UIImage(named: "profilepic")
cell.separatorInset.left = CGFloat(55)
cell.separatorInset.right = CGFloat(5)
return cell
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
if self.searchBar.isFirstResponder
return 55
else
if indexPath.row == 0
return 30
else
return 55
【问题讨论】:
【参考方案1】:为此,我建议查看UISearchBarDelegate
中的其他方法,特别是searchBarTextDidBeginEditing()
和searchBarTextDidEndEditing()
。在这些委托方法中的每一个中,您都可以调用 [self.tableView reloadData]
来更新所有单元格。
另外,实现FriendRequestsTitleCell
的另一种方法是将自定义标题视图添加到您的表格视图中,因为您使用的单元格只会出现在表格视图的顶部。
【讨论】:
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