微信支付SDK官方说明文档很坑，非常不详细，以下是本人的总结，希望新手不被官方坑。

Info

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引用

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桥接头文件 xxx-Bridging-Header.h

import "WXApi.h"

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Other Linker Flags

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AppDelegate

在 didFinishLaunchingWithOptions 中注册微信支付：

WXApi.registerApp("YourAPPID", withDescription: "YourDescription")

返回App后走这里，有两个方法是由于iOS版本不同而产生：

extension AppDelegate {
    
    func application(_ application: UIApplication, handleOpen url: URL) -> Bool {
        return WXApi.handleOpen(url, delegate: self)
    }
    
    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey: Any] = [:]) -> Bool {
        return WXApi.handleOpen(url, delegate: self)
    }

}

微信支付回调：

extension AppDelegate: WXApiDelegate {
    
    func onResp(_ resp: BaseResp!) {
        if let response = resp as? PayResp {
            switch response.errCode {
            case WXSuccess.rawValue:
                NotificationCenter.default.post(name: NSNotification.Name.WechatPayObserver, object: nil, userInfo: ["PayResult": PayResult.successful])
            default:
                NotificationCenter.default.post(name: NSNotification.Name.WechatPayObserver, object: nil, userInfo: ["PayResult": PayResult.failed])
            }
        }
    }
    
}