我有一个文本字段，当用户点击它时，一个table1出现，其中包含国家/地区货币列表，然后用户选择一种货币并将其添加到table2中，我可以添加一种货币，当我将另一种货币添加到table2中时，应用崩溃并显示以下错误：由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'在无效索引路径（{length = 2，path = 0-1}）处请求rect''
class CurrencySecondStep: UIViewController ,UITableViewDataSource, UITableViewDelegate,UITextFieldDelegate {
@IBOutlet weak var tableViewAddedByUser: UITableView!
@IBOutlet weak var amountToBeExchanged: UILabel!
@IBOutlet weak var tableViewFor: UITableView!
@IBOutlet weak var textFieldFor: UITextField!
//cell identifier
let cellReuseIdentifier = "cell"
//struct
struct Currency {
var country = String()
var currencyCode = String()
var currencyFlag = UIImage()
}
var addedCurrencyByUserArray = [Currency]()
var currencyArr = [
Currency(country: "United Arab Emirates Dirham", currencyCode: "AED",currencyFlag: UIImage(named:"United-Arab-Emirates")!),
Currency(country: "US Dollar", currencyCode: "USD",currencyFlag: UIImage(named:"United-States")!),
Currency(country: "Afghan Afghani (1927–2002)", currencyCode: "AFA",currencyFlag: UIImage(named:"Afghanistan")!),
Currency(country: "Albania Lek", currencyCode: "ALL",currencyFlag: UIImage(named:"Albania")!),
Currency(country: "Algerian Dinar", currencyCode: "DZD",currencyFlag: UIImage(named:"Algeria")!),
Currency(country: "Angolan Kwanza", currencyCode: "AOA",currencyFlag: UIImage(named:"Angola")!),
Currency(country: "Argentine Peso", currencyCode: "ARS",currencyFlag: UIImage(named:"Argentina")!),
Currency(country: "Armenian Dram", currencyCode: "AMD",currencyFlag: UIImage(named:"Armenia")!)
]
//searched results
var filteredCurrenciesOffer = [Currency]()
//currency code to be sent to google finance
var currencyCodeOffer = ""
var currencyPassed = ""
var countryChoice = ""
var countryCodeChoice = ""
var countryflagChoice = UIImage()
@IBAction func textFieldChanged(_ sender: AnyObject) {
tableViewFor.isHidden = true
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
tableViewFor.delegate = self
tableViewFor.dataSource = self
tableViewFor.isHidden = true
textFieldFor.delegate = self
textFieldFor.addTarget(self, action: #selector(textFieldActive), for: UIControlEvents.touchDown)
textFieldFor.addTarget(self, action:#selector(textFieldDidChange) , for: UIControlEvents.editingChanged)
//hide or show keyboard
textFieldFor.addTarget(self, action: #selector(textFieldShouldReturn), for: UIControlEvents.touchDown)
amountToBeExchanged.text = currencyPassed
//table added By User
tableViewAddedByUser.delegate = self
tableViewAddedByUser.dataSource = self
tableViewAddedByUser.isHidden = true
}
当用户按下添加按钮插入第二个元素时，应用崩溃
@IBAction func addPressed(_ sender: Any) {
if(textFieldFor.text == ""){
displayError(title: "Currency Type",message:"Please Pick Your Currency")
}else{
tableViewAddedByUser.isHidden = false
addedCurrencyByUserArray.append(Currency(country: countryChoice, currencyCode: countryCodeChoice,currencyFlag: countryflagChoice))
tableViewAddedByUser.beginUpdates()
let insert = IndexPath(row: addedCurrencyByUserArray.count - 1, section: 0)
tableViewAddedByUser.insertRows(at: [insert], with: .automatic)
tableViewAddedByUser.endUpdates()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: TextField Functions
func textFieldDidEndEditing(_ textField: UITextField) {
filteredCurrenciesOffer = currencyArr.filter { currencyGiven in
return currencyGiven.country.lowercased().contains(textFieldFor.text!.lowercased())
}
//reload table based on the user pick
tableViewFor.reloadData()
}
func textFieldDidChange(textField: UITextField) {
//update search based on user search
filteredCurrenciesOffer = currencyArr.filter { currencyGiven in
return currencyGiven.country.lowercased().contains(textFieldFor.text!.lowercased())
}
tableViewFor.reloadData()
}
// Toggle the tableView visibility when click on textField
func textFieldActive(textField: UITextField) {
tableViewFor.isHidden = !tableViewFor.isHidden
}
//hide keyboard
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
// MARK: TableView Functions
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
var count:Int?
if (tableView == self.tableViewFor && textFieldFor.text != ""){
count = filteredCurrenciesOffer.count
}else if(tableView == self.tableViewFor && textFieldFor.text == ""){
count = currencyArr.count
}
if(tableView == self.tableViewAddedByUser){
count = addedCurrencyByUserArray.count
print("number of rows")
print(count!)
}
return count!
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tableViewFor.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomCell
var currency: Currency
if (tableView == self.tableViewFor){
if ( textFieldFor.text != "") {
currency = filteredCurrenciesOffer[indexPath.row]
} else {
currency = currencyArr[indexPath.row]
}
cell.flag.image = currency.currencyFlag
cell.country.text = currency.country
cell.currencyCode.text = currency.currencyCode
}
if (tableView == self.tableViewAddedByUser){
currency = addedCurrencyByUserArray[indexPath.row]
cell.flag.image = currency.currencyFlag
cell.country.text = currency.country
cell.currencyCode.text = currency.currencyCode
}
return cell
}
// MARK: UITableViewDelegate
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var currency: Currency
if(tableView == tableViewFor){
if textFieldFor.text != "" {
currency = filteredCurrenciesOffer[indexPath.row]
} else {
currency = currencyArr[indexPath.row]
}
//add image to currency text field
let leftImageView = UIImageView()
leftImageView.image = currency.currencyFlag
let leftView = UIView()
leftView.addSubview(leftImageView)
leftView.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
leftImageView.frame = CGRect(x: 10, y: 10, width: 20, height: 20)
textFieldFor.leftViewMode = .always
textFieldFor.leftView = leftView
//add country to currency text field
textFieldFor.text = currency.country
countryChoice = currency.country
countryCodeChoice = currency.currencyCode
countryflagChoice = currency.currencyFlag
currencyCodeOffer = currency.currencyCode
tableViewFor.isHidden = true
textFieldFor.endEditing(true)
}
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 0.0
}
//hide the table and keyboard
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?)
{
guard let touch:UITouch = touches.first else
{
return;
}
if touch.view != tableViewFor
{
textFieldFor.endEditing(true)
tableViewFor.isHidden = true
}
}
func displayError(title:String,message:String){
// Create the alert controller
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
// Create the actions
let retryButton = UIAlertAction(title: "Ok", style: UIAlertActionStyle.cancel) {
UIAlertAction in
NSLog("Cancel Pressed")
}
// Add the actions
alertController.addAction(retryButton)
}
}
最佳答案
我认为问题出在您的
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
在第一行中，即使需要
tableViewFor的单元格，也总是从tableViewAddedByUser出队。尝试以此替换第一行，这将从参数中发送的tableView中使单元出队：
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomCell
如果那不起作用，则尝试不指定indexPath，如下所示：
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CustomCell