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，取决于segue从一个ViewController传递到带有PickerViews的值，pickerViews的光标位于井位，一切正常但是......当我尝试交换时任何PickerView的游标，应用程序在相关的******PickerView.selectRow(index, inComponent: 0, animated: false)崩溃。页面收费后，我无法更改任何光标。

我认为这是因为如果if context == contextText确实如果我将contextText，statusText或fieldText设置为“”，则将游标设置为第一个值，但我可以随意改变它们。

任何想法，避免这些崩溃的技巧？

由于

Answer 1

如何不在pickerview中使用PickerView.selectRow：titleForRow ...方法？当选择器视图使行准备好显示时，将调用该方法。

在您使用数据源设置选择器视图之后的某个地方，只需循环访问您的数据并找到contentText / statusText / fieldText的索引，并且（如果找到的话）调用ContextPickerView / StatusPickerView / FieldPickerView.selectRow。

UIPickerView.selectRow滚动使崩溃

1 个答案: