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无法弄清楚这一点，通过下面的代码，我让用户在 a 上设置一个值WKPickerItem，将其存储在 中UserDefaults，然后在下次加载时InterfaceController加载它并尝试使用存储的值设置 PickerItem。问题是，如果我将值设置为 1 - 7，然后返回导航然后点击以再次显示此接口控制器，我会在 InterfacePicker 中看到正确的值。但是，如果我将它设置为 8、9 或 10，那么 InterfacePicker 只会上升到 7？正确的索引和项目打印到控制台，它只是 UI 中的实际值是错误的？

import WatchKit
import Foundation


class SettingsInterfaceController: WKInterfaceController {

    let defaults = UserDefaults.standard


    var shiftTimerHapticIntervalOptions = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

    var userShiftTimerHapticInterval = 10


    @IBOutlet var shiftTimerHapticIntervalPicker: WKInterfacePicker!


    @IBAction func shiftTimerHapticIntervalDidChange(_ value: Int) {
         WKInterfaceDevice.current().play(.click)
        userShiftTimerHapticInterval = shiftTimerHapticIntervalOptions[value]
    }


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

        let shiftTimerHapticIntervalPickerItems: [WKPickerItem] = shiftTimerHapticIntervalOptions.map {
            let pickerItem = WKPickerItem()
            pickerItem.caption = $0.description
            pickerItem.title = $0.description
            return pickerItem
        }

        shiftTimerHapticIntervalPicker.setItems(shiftTimerHapticIntervalPickerItems)

    }

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

        // Look up user settings

        if let userShiftTimerHapticIntervalUnwrapped = defaults.value(forKey: userShiftTimerHapticIntervalKey) as? Int {
            userShiftTimerHapticInterval = userShiftTimerHapticIntervalUnwrapped
            if let indexOfUserShiftTimerHapticInterval = shiftTimerHapticIntervalOptions.index(of: userShiftTimerHapticInterval) {                shiftTimerHapticIntervalPicker.setSelectedItemIndex(indexOfUserShiftTimerHapticInterval)
            }
        }
    }

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

        defaults.set(userShiftTimerHapticInterval, forKey: userShiftTimerHapticIntervalKey)

    }

}
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1 回答 1

1

试着打电话

shiftTimerHapticIntervalPicker.setSelectedItemIndex(indexOfUserShiftTimerHapticInterval)

in the the InterfaceController's didAppear() function instead of in the willActivate() function. I saw some of the same things, but more random, when trying to set the picker's index in the willActivate() function.

于 2018-03-21T13:58:45.980 回答