UIPickerView.selectRow 滚动导致崩溃

Question

我有 3 个 UIPickerView，每个都有不同的值：

let pickerContext = ["Aucun","@office","@computer","@home","@meeting","@read","@achat","@call"]
let pickerStatus = ["LATE","IN-PROCESS","COMPLETED","NOT-STARTED"]
let pickerField = ["INBOX","TODO","WAITING","MAYBE","NOTE"]

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if(pickerView.isEqual(ContextPickerView)){
        return pickerContext.count
    }
    if(pickerView.isEqual(StatusPickerView)){
        return pickerStatus.count
    }
    if(pickerView.isEqual(FieldPickerView)){
        return pickerField.count
    }
    return 0
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    if(pickerView.isEqual(ContextPickerView)){
        if contextText != ""{
            println(contextText)
            for (index, context) in enumerate(pickerContext)
            {
                if context == contextText
                {
                    ContextPickerView.selectRow(index, inComponent: 0, animated: false)
                }
            }
        }
        return pickerContext[row]
    }
    if(pickerView.isEqual(StatusPickerView)){
        if statusText != ""{
            println(statusText)
            for (index, status) in enumerate(pickerStatus)
            {
                if status == statusText
                {
                    StatusPickerView.selectRow(index, inComponent: 0, animated: false)
                }
            }
        }
        return pickerStatus[row]
    }
    if(pickerView.isEqual(FieldPickerView)){
        if fieldText != ""{
            println(fieldText)
            for (index, field) in enumerate(pickerField)
            {
                if field == fieldText
                {
                    FieldPickerView.selectRow(index, inComponent: 0, animated: false)
                }
            }
        }
        return pickerField[row]

    }

    return ""
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if(pickerView.isEqual(ContextPickerView)){
        contextText = pickerContext[row]
    }
    if(pickerView.isEqual(StatusPickerView)){
        statusText = pickerStatus[row]
    }
    if(pickerView.isEqual(FieldPickerView)){
        fieldText = pickerField[row]
    }

}

UIPickerViews 填充得很好，这取决于 segue 从一个 ViewController 传递给带有 PickerViews 的值，pickerViews 的光标在适当的位置，一切正常但是..当我尝试交换任何 PickerView 的光标时，应用程序在相关 ******PickerView.selectRow(index, inComponent: 0, animated: false) 上崩溃。页面收费后，我无法更改任何光标。

我认为是因为如果 if context == contextText 确实，如果我将 contextText、statusText 或 fieldText 设置为 ""，游标将设置为第一个值, 但我可以根据需要更改它们。

有什么办法可以避免这些崩溃吗？

谢谢

Answer 1

不尝试在 pickerview:titleForRow... 方法中使用 PickerView.selectRow 怎么样？当Picker视图使行准备好显示时，该方法正在调用。

在使用数据源设置选择器视图后的某处，只需遍历数据并找到 contentText/statusText/fieldText 的索引，然后（如果找到）调用 ContextPickerView/StatusPickerView/FieldPickerView.selectRow.

UIPickerView.selectRow 滚动导致崩溃

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