问题描述
我尝试将 searchBar 放入 TableView Cells 的第一行,但它只会引发错误,但我不明白为什么,有人能告诉我该怎么做吗?提前致谢!
//自定义单元格
class SearchCell: UITableViewCell,UISearchBarDelegate {
let searchbar = UISearchBar()
override init(style: UITableViewCell.CellStyle,reuseIdentifier: String?) {
super.init(style: style,reuseIdentifier: reuseIdentifier)
addSubview(searchbar)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setConstraints() {
searchbar.placeholder = "Country,City"
searchbar.delegate = self
searchbar.searchBarStyle = .minimal
//Constraints
searchbar.translatesAutoresizingMaskIntoConstraints = false
searchbar.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
searchbar.leadingAnchor.constraint(equalTo: leadingAnchor,constant: 10).isActive = true
searchbar.widthAnchor.constraint(equalToConstant: 280).isActive = true
searchbar.heightAnchor.constraint(equalToConstant: 40).isActive = true
}
override func awakeFromNib() {
super.awakeFromNib()
setConstraints()
}
override func setSelected(_ selected: Bool,animated: Bool) {
super.setSelected(selected,animated: animated)
// Configure the view for the selected state
}
}
这是包含 TableView 的 ViewController:
class SearchViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate {
func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
!Line 20! let cell = tableView.dequeueReusableCell(withIdentifier: "SearchCell") as! SearchCell
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell",for: indexPath)
return cell
}
}
let tableView = UITableView()
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
//
view.backgroundColor = .white
navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.title = "Search"
//Functions
configureTableView()
}
func configureTableView() {
view.addSubview(tableView)
tableView.rowHeight = 80
//Constraints
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
tableView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
tableView.heightAnchor.constraint(equalTo: view.heightAnchor).isActive = true
tableView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
}
}
我看了一些教程等,但他们没有帮助我,所以谢谢你们!
解决方法
您需要首先使用tableview 的reuseIdentifier 注册您的单元格。我在您发布的代码中没有看到这一点。
在 super.viewDidLoad()
之后添加类似
tableView.register(SearchCell.self,forCellReuseIdentifier: "SearchCell")