用于Force Touch / Digital Crown的WatchKit API？ [英] WatchKit API for Force Touch / Digital Crown?

问题描述

我对Apple Watch引入的新用户交互可能性感到非常兴奋，其中包括Force Touch和Digital Crown。

I'm very excited about the new user interaction possibilities introduced by the Apple Watch, among them, Force Touch and Digital Crown.

但是，我在WatchKit API中找不到它们。有没有办法接收Force Touch / Digital Crown的活动？是否可以为事件设置自定义处理程序？

However, I couldn't find mentions of them in the WatchKit API. Are there any ways to receive events from Force Touch / Digital Crown? Is it possible to have custom handlers for the events?

推荐答案

watchOS 3添加了 WKCrownSequencer 和 WKCrownDelegate 报告数字表冠的状态（如转速），以及在用户旋转表冠时接收通知。

watchOS 3 adds WKCrownSequencer and WKCrownDelegate to report the state of the digital crown (such as rotational speed), as well as to receive notifications when the user rotates the crown.

您可以使用冠序列器为控制场景或界面对象提供常规输入。

You can use the crown sequencer to provide general input to control scenes or interface objects.

Apple更新了他们的 WatchKit目录示例代码包括一个WKInterfaceController冠序列器示例，演示如何使用Apple Watch数字表冠与其他对象进行交互：

Apple has updated their WatchKit Catalog sample code to include a WKInterfaceController crown sequencer example demonstrating how to use the Apple Watch digital crown to interact with other objects:

class CrownDetailController: WKInterfaceController, WKCrownDelegate {
    @IBOutlet var velocityLabel: WKInterfaceLabel!
    @IBOutlet var stateLabel: WKInterfaceLabel!
    @IBOutlet var pickerView: WKInterfacePicker!

    override func awake(withContext context: AnyObject?) {
        super.awake(withContext: context)

        let itemList: [(String, String)] = [
            ("Item 1", "Red"),
            ("Item 2", "Green"),
            ("Item 3", "Blue")
        ]
        let pickerItems: [WKPickerItem] = itemList.map {
            let pickerItem = WKPickerItem()
            pickerItem.caption = $0.0
            pickerItem.title = $0.1
            return pickerItem
        }
        pickerView.setItems(pickerItems)

        crownSequencer.delegate = self
    }

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

    @IBAction func focusCrown(sender: AnyObject) {
        crownSequencer.focus()
    }

    func updateCrownLabels() {
        velocityLabel.setText(String(format: "RPS: %2.2lf", crownSequencer.rotationsPerSecond))
        stateLabel.setText(crownSequencer.isIdle ? "Idle: true" : "Idle: false")
    }

    func crownDidBecomeIdle(_ crownSequencer: WKCrownSequencer?) {
        updateCrownLabels()
    }

    func crownDidRotate(_ crownSequencer: WKCrownSequencer?, rotationalDelta: Double) {
        updateCrownLabels()
    }

}

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