在WatchKit中的接口控制器之间传递数据 [英] Passing Data between interface controllers in WatchKit

问题描述

如何使用Swift将存储在标签中的数据从我的接口控制器传递到WatchKit中的另一个接口控制器？我似乎无法在任何地方找到答案，希望有人在这里可以帮助我。我已经包含了我的代码部分，它涉及计算我需要传递的值。我基本上想要显示用户计算的相同值，并在下一个名为ResultsController的接口控制器中详细说明。非常感谢任何帮助：D

How would I pass data stored in a label from my Interface Controller to another interface controller in WatchKit using Swift? I can't seem to find an answer anywhere, hope someone here can help me. I've included the section of my code that deals with calculating the value I need passed. I basically want to show the same value that was calculated by the user and elaborate more on it in the next Interface Controller named ResultsController. Any help is greatly appreciated :D

class InterfaceController: WKInterfaceController {
     var currentValue: String = "0"

     func setDisplayValue(value: Double)
    {
        var percent = value
        //  check if value is an integer
        if value % 1 == 0
        {
            // our value is an integer
            currentValue = "\(Int(value))"// new value %
        }
        else
        {
            // our value is a float
            currentValue = "\(value)"
        }
        // Display 2 decimal places in final amount
       var round =  NSString(format:"%.2f", value)
        displayLabel.setText("$\(round)") // Display final value
        // This value is what I want to be passed to another label in another IC.
    }

    // Answer Tapped
    @IBAction func totalTapped() {
        if command != nil
        {
            let answer = command!.executeWithNewValue((currentValue as NSString).doubleValue)
            setDisplayValue(answer)
            command = nil
            calculationExecuted = true
        }
    }
}

这是我希望使用标签显示第一个值的第二个接口控制器。

This is the second Interface controller that I want the value from the first one to be displayed in using a label.

import WatchKit
import Foundation


class ResultsController: WKInterfaceController {

    @IBOutlet weak var totalLabel: WKInterfaceLabel!

    override func awakeWithContext(context: AnyObject?) {
        super.awakeWithContext(context)

        // Label to hold the same value as in previous Interface Controller
        totalLabel.setText("")
    }

    override func willActivate() {
        // This method is called when watch view controller is about to be visible to user
        super.willActivate()
    }

    override func didDeactivate() {
        // This method is called when watch view controller is no longer visible
        super.didDeactivate()
    }

}

编辑：这是我遵循的教程，我操作它有点基本上是一个小费。我在ResultsController中添加了用来保存用户使用InterfaceController中的计算器输入的信息，但我似乎无法将数据传递给RC中的标签，在命令中我删除了减法和除法，因为我不需要那些。所以我唯一的计算按钮是乘法和加法。它应该如何工作的示例：输入金额12.58 点击乘法并输入15 点击添加并显示最终金额14.46
我需要在单独的标签中将所有这些值传递给RC。

Here is the tutorial I followed, I manipulated it a bit to be essentially a tip cal. I added in ResultsController to hold the information inputted by the user using the calculator from InterfaceController but I can't seem to pass the data over to my labels in RC, in the Command I removed subtract and divide since I wouldn't be needing those. So the only calculation buttons I have are multiply and addition. Example of how it should work: Enter in an amount 12.58 tap multiply and enter in 15 tap add and it displays the final amount of 14.46 I need to pass over all of those values to RC in separate labels.

Github教程 - Apple Watch

以下是我要完成的工作：
将初始金额传递给标签，小费金额，以及将标签分类为账单的最终费用。

Here is what I am trying to accomplish: Passing the initial amount to a label, and the tip amount, as well as the final cost to separate labels to resemble a bill.

推荐答案

最好的方法是覆盖 contextForSegueWithIdentifier 从一个视图转换到另一个视图时调用的方法next。

The best way to do this is to override the contextForSegueWithIdentifier method that is called when you segue from one view to the next.

在 WKInterfaceController 之间传递数据的方法与使用<的方法略有不同传统的iOS应用程序中的code> UIViewController 。

The method of passing data between WKInterfaceControllers is a bit different than the method for doing so with UIViewControllers in a traditional iOS app.

通常情况下，你会这样做：

Normally, you'd do something like this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showDetail" {
        let controller: DetailViewController = (segue.destinationViewController as UINavigationController).topViewController as DetailViewController
        controller.myVariable = myValue
    }
}

然而，WatchKit中没有 prepareForSegue 方法。 contextForSegueWithIdentifier WKInterfaceController 方法类似，但它有一个明显的区别：它没有' t为您提供目标视图控制器的实例。

However, there is no prepareForSegue method in WatchKit. The contextForSegueWithIdentifier WKInterfaceController method is similar, but it has a glaring difference: it doesn't provide you with an instance of the destination view controller.

而是从方法返回数据，并访问目标类中的数据。

Instead, you return data from the method, and access that data within your target class.

所以，在你的情况下，它看起来像这样：

So, in your case, it would look like this:

// In InterfaceController
override func contextForSegueWithIdentifier(segueIdentifier: String) -> AnyObject? {
    // You may want to set the context's identifier in Interface Builder and check it here to make sure you're returning data at the proper times

    // Return data to be accessed in ResultsController
    return self.currentValue
}

// In ResultsController
override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)

    // Make sure data was passed properly and update the label accordingly
    if let val: String = context as? String {
        self.totalLabel.setText(val)
    } else {
        self.totalLabel.setText("")
    }
}

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