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ios - 无法解开 Promise<[CLPlacemark]>

问题描述

我有一种方法可以尝试更新我的授权状态。

使用 PromiseKit 6、Swift 4.2，我似乎无法让我的 Promise<[CLPlacemark]> 成为 CLPlacemark。

这会导致一连串的错误

Value of type 'Promise<[CLPlacemark]>' has no member 'foo'

这是我的代码：

func updateAuthStatus(status: CLAuthorizationStatus) {
    if status == .authorizedWhenInUse {
        titleLabel.isHidden = true
        bigIconView.isHidden = true
        descriptionLabel.isHidden = true
        grantBtn.isHidden = true
        titleLabel1.isHidden = false
        loaderView.isHidden = false
        loaderView.resumeSpinning()
        CLLocationManager.requestLocation().compactMapValues { location in
            return self.coder.reverseGeocode(location: location)
        }.compactMapValues { placemark -> Void in
            if placemark.ISOcountryCode == "CA" {
                self.seal.fulfill(())
            } else if placemark.ISOcountryCode == "US" {
                if self.allowedStates.contains(placemark.administrativeArea ?? "") {
                    self.seal.fulfill(())
                } else {
                        self.seal.reject(LocationError.InvalidState(placemark.administrativeArea ?? ""))
                }
            } else {
        self.seal.reject(LocationError.InvalidCountry(placemark.ISOcountryCode ?? ""))
            }
        }
    }
    else if status == .denied || status == .restricted {
        if denied == false {
            self.seal.reject(LocationError.Unknown)
        }
        denied = true
    }
}

标签： iosswiftswift4cllocationpromisekit

解决方案

正如您所提到的，这promise将返回一个对象数组，CLPlacemark因此您需要从中获取特定对象placemark然后array使用它。这是通过访问first placemark.array

.compactMapValues { placemarks -> Void in
            guard let placemark = placemarks.first else { return }

            if placemark.ISOcountryCode == "CA" {
                self.seal.fulfill(())
            } else if placemark.ISOcountryCode == "US" {
                if self.allowedStates.contains(placemark.administrativeArea ?? "") {
                    self.seal.fulfill(())
                } else {
                  self.seal.reject(LocationError.InvalidState(placemark.administrativeArea ?? ""))
                }
            } else {
        self.seal.reject(LocationError.InvalidCountry(placemark.ISOcountryCode ?? ""))
            }
        }

编辑

要处理 US 和 CA，可以提取该国家/地区的相关地标，如下所示，

.compactMapValues { placemarks -> Void in
       if let ca = placemarks.filter{ $0.ISOcountryCode == "CA"}.first {
            self.seal.fulfill(())
       } else if let usa = placemarks.filter{ $0.ISOcountryCode == "US"}.first {
            if self.allowedStates.contains(usa.administrativeArea ?? "") {
                self.seal.fulfill(())
            } else {
                let error = LocationError.InvalidState(usa.administrativeArea ?? "")
                self.seal.reject(error)
            }
    } else {
         let error = LocationError.InvalidCountry(placemarks.first?.ISOcountryCode ?? "")
         self.seal.reject(error)
     }
 }

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