如何判断当前运行的Apple Watch尺寸/尺寸是38mm还是42mm？

Question

我们知道Apple Watch有两种屏幕尺寸:38mm和42mm.本WKInterfaceDevice类提供一个名为读取的特性screenBounds.我写了一个扩展名WKInterfaceDevice,尝试添加一种方法来检测当前的设备类型.

import WatchKit

enum WatchResolution {

    case Watch38mm, Watch42mm
}

extension WKInterfaceDevice {

    class func currentResolution() -> WatchResolution {

        let watch38mmRect = CGRectMake(0.0, 0.0, 136.0, 170.0)
        let watch42mmRect = CGRectMake(0.0, 0.0, 156.0, 195.0)

        let currentBounds = WKInterfaceDevice.currentDevice().screenBounds

        if CGRectEqualToRect(currentBounds, watch38mmRect) {

            return WatchResolution.Watch38mm
        } else {

            return WatchResolution.Watch42mm
        }
    }
}

这是检测Apple Watch尺寸的正确方法吗？我在Apple文档中缺少另一种方法吗？

Answer 1

您的代码看起来不错,但有一些小问题:

• 您没有"未知"屏幕大小的案例(可能在将来发布)
• 你正在使用CGRectMake但是在Swift中你应该使用CGRect初始化器
• 你正在使用,CGRectEqualToRect但在Swift你可以使用==或switch
• 你明确地返回WatchResolution枚举,但你不需要明确--Swift会从你的方法签名中找出它
• 你宣布watch42mmRect但没有用它做任何事情

我会像这样重写它:

enum WatchResolution {
    case Watch38mm, Watch42mm, Unknown
}

extension WKInterfaceDevice {
    class func currentResolution() -> WatchResolution {
        let watch38mmRect = CGRect(x: 0, y: 0, width: 136, height: 170)
        let watch42mmRect = CGRect(x: 0, y: 0, width: 156, height: 195)

        let currentBounds = WKInterfaceDevice.currentDevice().screenBounds

        switch currentBounds {
        case watch38mmRect:
            return .Watch38mm
        case watch42mmRect:
            return .Watch42mm
        default:
            return .Unknown
        }
    }
}

Answer 2

更新Swift 4：

它包括新推出的Watch分辨率：

enum WatchResolution {
    case Watch38mm, Watch40mm,Watch42mm,Watch44mm, Unknown  
}

extension WKInterfaceDevice {
class func currentResolution() -> WatchResolution {
    let watch38mmRect = CGRect(x: 0, y: 0, width: 136, height: 170)
    let watch40mmRect = CGRect(x: 0, y: 0, width: 162, height: 197)
    let watch42mmRect = CGRect(x: 0, y: 0, width: 156, height: 195)
    let watch44mmRect = CGRect(x: 0, y: 0, width: 184, height: 224)

    let currentBounds = WKInterfaceDevice.current().screenBounds

    switch currentBounds {
    case watch38mmRect:
        return .Watch38mm
    case watch40mmRect:
        return .Watch40mm
    case watch42mmRect:
        return .Watch42mm
    case watch44mmRect:
        return .Watch44mm
    default:
        return .Unknown
    }
  } 
}

用法

let resol = WKInterfaceDevice.currentResolution()
    switch resol {
    case .Watch38mm, .Watch42mm:
        // Do Something
    case .Watch40mm, .Watch44mm:
        // Do Something
    default:
        // Do Something
    }

参考链接： Apple Developer Watch界面链接

希望有帮助...

谢谢

Answer 3

这就是我正在做的：

enum WatchModel {
    case w38, w40, w42, w44, unknown
}

extension WKInterfaceDevice {

    static var currentWatchModel: WatchModel {
        switch WKInterfaceDevice.current().screenBounds.size {
        case CGSize(width: 136, height: 170):
            return .w38
        case CGSize(width: 162, height: 197):
            return .w40
        case CGSize(width: 156, height: 195):
            return .w42
        case CGSize(width: 184, height: 224):
            return .w44
        default:
            return .unknown
    }
  }
}