ios - 使用选取器 View 时出现索引超出范围错误
<p><p>我使用不同的数组填充了一个选择器 View ，具体取决于您单击的文本字段。但是，每当我选择“Untergrund”数组的第五行时，应用程序就会崩溃，并出现索引超出范围错误。它向我显示行 int = 4 和组件 int = 0。错误发生在在 did select 行函数中设置第一个 if 语句的行中。我不知道为什么会这样......</p>
<p>以下是相关代码:</p>
<pre><code>@IBOutlet weak var Stadt: UITextField!
@IBOutlet weak var Strasse: UITextField!
@IBOutlet weak var Platzart: UITextField!
@IBOutlet weak var Groesse: UITextField!
@IBOutlet weak var AnzToreKoerbe: UITextField!
@IBOutlet weak var Untergrund: UITextField!
// Variable für die Firebase Database
override func viewDidLoad() {
super.viewDidLoad()
Stadt.delegate = self
Untergrund.delegate = self
Groesse.delegate = self
AnzToreKoerbe.delegate = self
Platzart.delegate = self
Picker.delegate = self
}
@IBOutlet weak var Picker: UIPickerView!
var currentData = [""]
let UntergrundArray = ["Asphalt", "Kunstrasen Sand", "Kunstrasen Granulat", "Rasen", "Tartan", " "]
let StadtArray = ["Norderstedt", "Hamburg", "Berlin", "München"]
let GroesseArray = [ "2 vs 2", "3 vs 3", "4 vs 4", "5 vs 5"]
let AnzTorKoerbe = ["1", "2", "3", "4"]
let Art = ["Fußball", "Basketball"]
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool{
if textField.tag == 1{
currentData = StadtArray
}else if textField.tag == 2{
currentData = UntergrundArray
}else if textField.tag == 3 {
currentData = GroesseArray
}else if textField.tag == 4 {
currentData = AnzTorKoerbe
}else if textField.tag == 5 {
currentData = Art
}
Picker.reloadAllComponents()
return false;
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return currentData.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return currentData
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let itemSelected = currentData
print(itemSelected)
if (itemSelected == StadtArray) {
Stadt.text = StadtArray
}else if (itemSelected == UntergrundArray) {
Untergrund.text = UntergrundArray
}else if (itemSelected == GroesseArray) {
Groesse.text = GroesseArray
}else if (itemSelected == AnzTorKoerbe) {
AnzToreKoerbe.text = AnzTorKoerbe
}else {
Platzart.text = Art
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p><code>currentData</code> 可以是任何其他数组。 <code>row</code> 可以用于比某些数组更大的索引。这就是崩溃的原因。</p>
<p>正确的解决方案是修正您确定要更新哪个标签的方式。</p>
<pre><code>func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let itemSelected = currentData
if currentData === StadtArray {
Stadt.text = itemSelected
} else if currentData === UntergrundArray {
Untergrund.text = itemSelected
} else ... and the others as needed
}
</code></pre>
<p>虽然更好的选择可能是添加另一个属性来跟踪当前文本字段。</p>
<pre><code>var currentField: UITextField?
</code></pre>
<p>然后更新<code>textFieldShouldBeginEditing</code>:</p>
<pre><code>func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool{
currentField = textField
if textField.tag == 1 {
currentData = StadtArray
} else if textField.tag == 2 {
currentData = UntergrundArray
} else if textField.tag == 3 {
currentData = GroesseArray
} else if textField.tag == 4 {
currentData = AnzTorKoerbe
} else if textField.tag == 5 {
currentData = Art
}
Picker.reloadAllComponents()
return false;
}
</code></pre>
<p>然后更新<code>didSelectRow</code>:</p>
<pre><code>func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let itemSelected = currentData
if let currentField = currentField {
currentField.text = itemSelected
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 使用选取器 View 时出现索引超出范围错误，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/42655580/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/42655580/
</a>
</p>
页:
[1]