「Swift」跳转至第三方App｜淘宝、天猫、京东

前言：如何从自己的App跳转到相应的淘宝、天猫、京东等第三方App中相应的商品或店铺

1.配置环境

需要在Info.plist 里面建立一个叫 LSApplicationQueriesSchemes 的 Array类型，将相应的app Scheme添加进LSApplicationQueriesSchemes字段

该字段并不是所谓的白名单，而是在iOS9后，如果想要使用canOpenURL方法检查是否可以打这个URL或可以处理该URL的的App
需要在info.plist里添LSApplicationQueriesSchemes字段来预设url，否则是否安装都会返回NO。如果想要打开其他App，直接使用openURL即可

常见的第三方App Scheme

<key>LSApplicationQueriesSchemes</key><array><!-- 微信 URL Scheme 白名单--><string>wechat</string><string>weixin</string><!-- 新浪微博 URL Scheme 白名单--><string>sinaweibohd</string><string>sinaweibo</string><string>sinaweibosso</string><string>weibosdk</string><string>weibosdk2.5</string><!-- 京东 URL Scheme 白名单--><string>openapp.jdmobile</string><!-- 淘宝 URL Scheme 白名单--><string>taobao</string><!-- 天猫 URL Scheme 白名单--><string>tmall</string><!-- 支付宝  URL Scheme 白名单--><string>alipay</string><string>alipayshare</string>
</array>

2.编写跳转方法

ps：以下方法参数均是使用pc端网页url，即可跳转至相对应App的页面

1.跳转至淘宝店铺

传入的url必须带有shopId参数，如：https://shop561496733.taobao.com/?spm=a230r.7195193.1997079397.2.1b8a264cZChmYE

///跳转至淘宝店铺页public func turnToTaobaoShop(urlStr: String) {let url = URL(string: urlStr)!let host = url.host!let startIndex = host.index(host.startIndex, offsetBy: 4)let endIndex = host.firstIndex(of: ".") ?? host.endIndexif endIndex == host.endIndex { return }let shopId = host[startIndex..<endIndex]guard let appURL = URL(string: "taobao://shop.m.taobao.com/shop/shop_index.htm?shop_id="+shopId+"") else {return}/// 判断手机是否安装了淘宝Appif UIApplication.shared.canOpenURL(appURL) {UIApplication.shared.open(appURL, options: [:], completionHandler: nil)} else {/// 没安装淘宝，使用浏览器打开相对应页面UIApplication.shared.open(url, options: [:], completionHandler: nil)}}

2.跳转至淘宝商品

传入的url必须带有商品id，与店铺Id类似，不再举例

///跳转至淘宝商品详情页public func turnToTaobaoItem(urlStr: String) {let url = URL(string: urlStr)!let itemDict:[String:String] = url.urlParameters ?? [:]let itemId = itemDict["id"]!guard let appURL = URL(string: "taobao://item.taobao.com/item.htm?id="+itemId+"") else {return}/// 判断手机是否安装了淘宝Appif UIApplication.shared.canOpenURL(appURL) {UIApplication.shared.open(appURL, options: [:], completionHandler: nil)} else {/// 手机没有安装App，使用浏览器打开相对应页面UIApplication.shared.open(url, options: [:], completionHandler: nil)}}

3.跳转至天猫店铺

因为天猫店铺的url中不带店铺Id，所以需要通过在店铺页面上打开网页检查器，取出店铺Id并与url一起传入参数

///跳转至天猫店铺页public func turnToTmallShop(urlStr: String, shopId: String) {guard let url = URL(string: "tmall://page.tm/shop?shopId="+shopId+"") else {return}if UIApplication.shared.canOpenURL(url) {UIApplication.shared.open(url, options: [:], completionHandler: nil)} else {UIApplication.shared.open(URL(string: urlStr)!, options: [:], completionHandler: nil)}}

4.跳转至天猫商品

///跳转至天猫商品详情页public func turnToTmallItem(urlStr: String) {let url = URL(string: urlStr)!let itemDict:[String:String] = url.urlParameters ?? [:]let itemId = itemDict["id"]!guard let appURL = URL(string: "tmall://tmallclient/?action:item:id="+itemId+"") else {return}if UIApplication.shared.canOpenURL(appURL) {UIApplication.shared.open(appURL, options: [:], completionHandler: nil)} else {UIApplication.shared.open(url, options: [:], completionHandler: nil)}}

5.跳转至京东商品详情或商品店铺

///跳转至京东商品详情页或店铺页func TurnToJD(urlStr: String){let jdDict = ["category":"jump", "des":"getCoupon", "url":urlStr]guard let jdStr = jdDict.formatJSON() else { return }let url = "openApp.jdmobile://virtual?params=\(jdStr)"let utf8Str = url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)guard let appURL = URL(string: utf8Str ?? "") else {return}if UIApplication.shared.canOpenURL(appURL) {UIApplication.shared.open(appURL, options: [:], completionHandler: nil)} else {UIApplication.shared.open(URL(string: urlStr)!, options: [:], completionHandler: nil)}}

6.添加扩展方法
因为以上方法使用到了url参数分解和序列化字典到JSON字符串，所以需要添加一下扩展方法

// MARK: - Extension
extension URL {var urlParameters: [String: String]? {guard let components = URLComponents(url: self, resolvingAgainstBaseURL: true),let queryItems = components.queryItems else { return nil }return queryItems.reduce(into: [String: String]()) { (result, item) inresult[item.name] = item.value}}
}extension Dictionary {/// 将JSON字符串反序列化到字典中public static func constructFromJSON (json: String) -> Dictionary? {if let data = (try? JSONSerialization.jsonObject(with: json.data(using: String.Encoding.utf8,allowLossyConversion: true)!,options: JSONSerialization.ReadingOptions.mutableContainers)) as? Dictionary {return data} else {return nil}}/// 序列化字典到JSON字符串public func formatJSON() -> String? {if let jsonData = try? JSONSerialization.data(withJSONObject: self, options: JSONSerialization.WritingOptions()) {let jsonStr = String(data: jsonData, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))return String(jsonStr ?? "")}return nil}
}

注：给大家排除一个网上大多数文章所传输的误解
网上大多数跳转至第三方App的文章都要求大家配置URL types，其实这个配置文件不是用来跳转至外部App，而是用来从外部App跳转至自己的App中使用的，如自己设置了一个URL Scheme，举个