ios - 在 Playground 中编译正常的编译器错误

Question

我有以下代码，如果在 Playground 中检查，则符合正常要求(除了由操作触发的函数)...但在我的应用程序中，我遇到了 7 个编译错误。

我的代码:

import UIKit

class LocationViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {


@IBOutlet weak var DisplayStartMileage: UITextField!
@IBOutlet weak var labelFuelAmount: UILabel!
@IBOutlet weak var spinFuelAmount: UIPickerView!

var mileageToPass: String!

var fuelAmount: Double = 0.00

var poundValues = [String]()
var penceValues = [String]()

for var indexP:Int = 0; indexP < 100; indexP += 1 {
poundValues.append("£ \(indexP)")
penceValues.append(NSString(format: ".%02d", indexP) as String)
}

let pickerData = [poundValues, penceValues]


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    DisplayStartMileage.text = mileageToPass;

    spinFuelAmount.delegate = self
    spinFuelAmount.dataSource = self

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func FuelSegmentChanged(sender: UISegmentedControl) {

    switch sender.selectedSegmentIndex
    {
    case 0:
        labelFuelAmount.hidden = false
        spinFuelAmount.hidden = false

    case 1:
        labelFuelAmount.hidden = true
        spinFuelAmount.hidden = true

    default:
        break; 
    }

}

func numberOfComponentsInPickerView(spinFuelAmount: UIPickerView) -> Int {
    return pickerData.count
}

func pickerView(spinFuelAmount: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerData[component].count
}

func pickerView(spinFuelAmount: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return pickerData[component][row]
}

func pickerView(spinFuelAmount: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    let fuelAmount = Int(pickerData[0][spinFuelAmount.selectedRowInComponent(0)].stringByReplacingOccurrencesOfString("£ ", withString: "")) + Int(pickerData[1][spinFuelAmount.selectedRowInComponent(1)].stringByReplacingOccurancesOfString(".", withString: ""))/100

}

}

现在我知道 SO 不适用于调试，但我不知所措...大多数代码都符合 Playground，但许多行确实符合我的 ViewController 类中的 Playground 错误。

Answer 1

我会放弃将 poundValues 和 penceValues 作为成员属性，并在 viewDidLoad() 中设置所有这些内容:

var pickerData = [[String]]()

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view, typically from a nib.
    DisplayStartMileage.text = mileageToPass;

    var poundValues = [String]()
    var penceValues = [String]()
    for var indexP:Int = 0; indexP < 100; indexP += 1 {
        poundValues.append("£ \(indexP)")
        penceValues.append(NSString(format: ".%02d", indexP) as String)
    }
    self.pickerData = [poundValues, penceValues]

    spinFuelAmount.delegate = self
    spinFuelAmount.dataSource = self
}

更新

以下是对该 pickerView(_:didSelectRow:inComponent) 方法的建议:

func pickerView(spinFuelAmount: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    var firstComponent = pickerData[0][spinFuelAmount.selectedRowInComponent(0)]
    firstComponent = firstComponent.stringByReplacingOccurrencesOfString( "£ ", withString: "" )

    var secondComponent = pickerData[1][spinFuelAmount.selectedRowInComponent(1)]
    secondComponent = firstComponent.stringByReplacingOccurrencesOfString( "£ ", withString: "" )

    if let firstValue = Int(firstComponent), let secondValue = Int(secondComponent) {
        let fuelAmount = firstValue + secondValue / 100
    }
}