嘿，伙计们，我需要一些关于我的代码的帮助，请看一下图片看看我看到了什么。我在Swift中做了一个小费计算器项目，我必须有一个设置视图来选择默认的小费率。我有一些错误，我必须尽快改正。我将非常感谢有人纠正我的代码并测试它。下面是两个View Controller的代码，我没有发布设置viewcontroller的图片，因为网站不允许我发布两个以上的链接，直到我获得更多的声誉。
Xcode中的错误：
故事板：检查图片，我在第一行有一些错误。
import UIKit
class ViewController: UIViewController, SettingDelegate {
// Inputs
@IBOutlet weak var amountTextField: UITextField!
//Labels
@IBOutlet weak var TipPercentageLabel: UILabel!
@IBOutlet weak var numberOfPersonLabel: UILabel!
@IBOutlet weak var tipAmountLabel: UILabel!
@IBOutlet weak var totalBillLabel: UILabel!
@IBOutlet weak var billPerPersonLabel: UILabel!
//Slider & Stepper
@IBOutlet weak var tipSlider: UISlider!
@IBOutlet weak var personsStepper: UIStepper!
//Variables
var tipPercentage : Double = NSUserDefaults.standardUserDefaults().doubleForKey("DefaultTipRate") ?? 0.20
var numberOfPerson:Int = 1
let numberFormatter:NSNumberFormatter = NSNumberFormatter()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tipAmountLabel.text = "$0.00"
totalBillLabel.text = "Bill Total"
billPerPersonLabel.text = "$0.00"
TipPercentageLabel.text = "20.0%"
numberOfPersonLabel.text = "1"
self.amountTextField.becomeFirstResponder()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setupContainer() {
tipSlider.minimumValue = 0
tipSlider.maximumValue = 100
tipSlider.value = 20
tipSlider.addTarget(self, action: "sliderTipChanged:", forControlEvents: .ValueChanged)
personsStepper.minimumValue = 1
personsStepper.maximumValue = 30
personsStepper.value = 1
personsStepper.addTarget(self, action: "sliderPersonChanged:", forControlEvents: .ValueChanged)
amountTextField.text = ""
refreshCalculation()
}
@IBAction func OnEditingFieldBill(sender: AnyObject) {
refreshCalculation()
}
func refreshCalculation() {
numberFormatter.numberStyle = NSNumberFormatterStyle.DecimalStyle
if let amount = numberFormatter.numberFromString(amountTextField.text!) as? Double {
let tipAmount = amount * tipPercentage
let totalBill = amount + tipAmount
let billPerPerson = totalBill / Double(numberOfPerson)
numberFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
tipAmountLabel.text = numberFormatter.stringFromNumber(tipAmount)
totalBillLabel.text = numberFormatter.stringFromNumber(totalBill)
billPerPersonLabel.text = numberFormatter.stringFromNumber(billPerPerson)
} else {
tipAmountLabel.text = "-"
totalBillLabel.text = "-"
billPerPersonLabel.text = "-"
}
numberFormatter.numberStyle = NSNumberFormatterStyle.PercentStyle
numberFormatter.minimumFractionDigits = 1
numberFormatter.maximumFractionDigits = 1
TipPercentageLabel.text = self.numberFormatter.stringFromNumber(tipPercentage)
numberOfPersonLabel.text = "\(numberOfPerson)"
}
@IBAction func sliderTipChanged(sender: UISlider) {
tipPercentage = Double(round(tipSlider.value)) / 100
refreshCalculation()
}
@IBAction func StepperPersonChanged(sender: UIStepper) {
numberOfPerson = Int(round(personsStepper.value))
refreshCalculation()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let SettingsViewController = segue.destinationViewController as?SettingsViewController {
SettingsViewController.delegate = self
refreshCalculation()
}
}
}
下面是设置视图控件：
import UIKit
protocol SettingDelegate {
func tipPercentageChanged(newValue : Double)
}
class SettingsViewController: UIViewController {
var destName : String!
var delegate : SettingDelegate?
@IBOutlet weak var tipControl: UISegmentedControl!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func DefaultRate(sender: AnyObject) {
var tipRates = [0.05, 0.10, 0.15, 0.20, 0.25, 0.30]
let tipRate = tipRates[tipControl.selectedSegmentIndex]
delegate?.tipPercentageChanged(tipRate)
NSUserDefaults.standardUserDefaults().setDouble(tipRate, forKey: "DefaultTipRate")
NSUserDefaults.standardUserDefaults().synchronize()
}
/
最佳答案
对于第一个错误：
当aviewController符合协议时，它需要实现协议实现的方法。在你的情况下，定义你应该
func tipPercentageChanged(newValue : Double) {
//save the new value here
}
第一个错误应该消失。
看起来您正在使用
SettingsViewController转换呈现modal，因此可以使用self.dismissViewControllerAnimated(true, completion: {})
关于ios - 准备进行数据传递，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/34203116/