转自：http://www.myexception.cn/swift/1991018.html

前言

Swift 语言，怎么说呢，有一种先接受后排斥，又欢迎的感觉，纵观国外大牛开源框架或项目演示，Swift几乎占据了多半，而国内虽然出现很多相关技术介绍和教程，但是在真正项目开发中使用的占据很少部分，原因一是目前熟练它的开发者并不多，二是版本不太稳定，还需要更成熟可靠的版本支持，但总之未来还是很有前景的，深有体会，不管是代码量还是编译效率，以及语言特性，现代性都优于Object-C，估计后续会被苹果作为官方开发语言，值得期待。

走起

鉴于此，笔者将之前用Object-C写的SSO授权登录：微信，QQ和微博，重新用Swift语言写一遍，以便需要的朋友参考，算是SSO授权登录的姊妹篇；

一、总体架构

1、引入第三方库

除了必须引入对应的登录SDK外，额外引入了SDWebImage，SVProgressHUD，看名字大家都明白吧，引入登录SDK请各自看官方的开发文档，需要加入什么系统库文件，需要配置Other Linker Flags 等，请参考各自官方文档即可；

2、配置连接桥文件

因为创建的工程是基于Swift语言，目前官方SDK和其它三方库都是用OC写的，所以为了在swift中调用oc代码，需要配置连接桥文件Bridging-Header.h，搜索objective-C bridging Header健，然后在值里面输入XXXLogin/Bridging-Header.h，注意是绝对路径，里面可以输入需要调用的头文件，如

#import "WXApi.h"
#import "SVProgressHUD.h"
#import "UIImageView+WebCache.h"

3、配置工程

因为是SSO跳转方式，需要配置URL Schemes，以便程序返回识别宿主程序，配置方法很简单，参考各自文档即可，在info里面可以可视化添加，各自的key值采用官方demo所提供；

二、微信

1、注册

func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.

    //向微信注册
    WXApi.registerApp(kWXAPP_ID)

    return true
}

2、授权登录

override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self,selector:"onRecviceWX_CODE_Notification:",name: "WX_CODE",object: nil)

    let sendBtn:UIButton = UIButton()
    sendBtn.frame = CGRectMake(30,100,kIPHONE_WIDTH-60,40)
    sendBtn.backgroundColor = UIColor.redColor()
    sendBtn.setTitleColor(UIColor.whiteColor(),forState: UIControlState.Normal)
    sendBtn.setTitle("Swift版本之微信授权登录",forState: UIControlState.Normal)
    sendBtn.addTarget(self,action: "sendBtnClick:",forControlEvents: UIControlEvents.TouchUpInside)
    self.view.addSubview(sendBtn)


    headerImg = UIImageView(frame: CGRectMake(30,160,120,120))
    headerImg.backgroundColor = UIColor.yellowColor()
    self.view.addSubview(headerImg)

    nicknameLbl.frame = CGRectMake(170,kIPHONE_WIDTH-60-140,40)
    nicknameLbl.backgroundColor = UIColor.lightGrayColor()
    nicknameLbl.textColor = UIColor.purpleColor()
    nicknameLbl.textAlignment = NSTextAlignment.Center
    self.view.addSubview(nicknameLbl)
}


func sendBtnClick(sneder:UIButton){
    sendWXAuthRequest()
}

//微信登录 第一步
func sendWXAuthRequest(){
    let req : SendAuthReq = SendAuthReq()
    req.scope = "snsapi_userinfo,snsapi_base"
    WXApi .sendReq(req)
}

3、回调

func onResp(resp: BaseResp!) {
    /* ErrCode ERR_OK = 0(用户同意) ERR_AUTH_DENIED = -4（用户拒绝授权） ERR_USER_CANCEL = -2（用户取消） code 用户换取access_token的code，仅在ErrCode为0时有效 state 第三方程序发送时用来标识其请求的唯一性的标志，由第三方程序调用sendReq时传入，由微信终端回传，state字符串长度不能超过1K lang 微信客户端当前语言 country 微信用户当前国家信息 */
    // var aresp resp :SendAuthResp!
    var aresp = resp as! SendAuthResp
    // var aresp1 = resp as? SendAuthResp

    if (aresp.errCode == 0)
    {
        println(aresp.code)
        //031076fd11ebfa5d32adf46b37c75aax
        var dic:Dictionary<String,String>=["code":aresp.code];
        let value = dic["code"]
        println("code:\(value)")

        NSNotificationCenter.defaultCenter().postNotificationName("WX_CODE",object: nil,userInfo: dic)
    }
}

4、获取用户信息

//微信回调通知,获取code 第二步
func onRecviceWX_CODE_Notification(notification:NSNotification){
    SVProgressHUD.showSuccessWithStatus("获取到code",duration: 1)
    var userinfoDic : Dictionary = notification.userInfo!
    let code: String = userinfoDic["code"] as! String
    print("Recevice Code: \(code)")
    self.getAccess_token(code)
}

//获取token 第三步
func getAccess_token(code :String){
    //https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
    var requestUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=\(kWXAPP_ID)&secret=\(kWXAPP_SECRET)&code=\(code)&grant_type=authorization_code"
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),{
        var requestURL: NSURL = NSURL(string: requestUrl)!
        var data = NSData(contentsOfURL: requestURL,options: NSDataReadingOptions(),error: nil)
        dispatch_async(dispatch_get_main_queue(),{
            var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data!,options: NSJSONReadingOptions.MutableContainers,error: nil) as! NSDictionary
            println("Recevice Token: \(jsonResult)")
            SVProgressHUD.showSuccessWithStatus("获取到Token和openid",duration: 1)
            let token: String = jsonResult["access_token"] as! String
            let openid: String = jsonResult["openid"] as! String
            self.getUserInfo(token,openid: openid)
        })
    })
}

//获取用户信息 第四步
func getUserInfo(token :String,openid:String){
    // https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID
    var requestUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=\(token)&openid=\(openid)"
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,error: nil) as! NSDictionary
            print("Recevice UserInfo: \(jsonResult)")
            /* Recevice UserInfo: { city = Chaoyang; country = CN; headimgurl = "http://wx.qlogo.cn/mmopen/FrdAUicrPIibcpGzxuD0kjfssQogj3icL8QTJQYUCLpgzSnvY6rJFGORreicpuiaPCzojwNlsXq4ibbc8e3gGFricWqJU5ia7ibicLVhfT/0"; language = "zh_CN"; nickname = "\U706b\U9505\U6599"; openid = "oyAaTjkR8T6kcKWyA4VPYDa_Wy_w"; privilege = ( ); province = Beijing; sex = 1; unionid = "o1A_Bjg52MglJiEjhLmB8SyYfZIY"; } */

            SVProgressHUD.showSuccessWithStatus("获取到用户信息",duration: 1)
            let headimgurl: String = jsonResult["headimgurl"] as! String
            let nickname: String = jsonResult["nickname"] as! String
            self.headerImg.sd_setImageWithURL(NSURL(string: headimgurl))
            self.nicknameLbl.text = nickname
        })
    })
}

5、跳转

//微信的跳转回调
func application(application: UIApplication,openURL url: NSURL,sourceApplication: String?,annotation: AnyObject?) -> Bool    {
    return  WXApi.handleOpenURL(url,delegate: self)
}
func application(application: UIApplication,handleOpenURL url: NSURL) -> Bool {
    return  WXApi.handleOpenURL(url,delegate: self)
}

三、QQ

1、注册

func sendBtnClick(sneder:UIButton){
    sendQQAuthRequest()
}

//第一步 QQ登录
func sendQQAuthRequest(){
    tencentOAuth = TencentOAuth(appId: kQQAPP_ID,andDelegate: self)
    var permissions = [kOPEN_PERMISSION_GET_INFO,kOPEN_PERMISSION_GET_USER_INFO,kOPEN_PERMISSION_GET_SIMPLE_USER_INFO]
    tencentOAuth.authorize(permissions,inSafari: false)
}

2、授权登录

如上

3、回调

//第二步 登录成功回调
func tencentDidLogin() {
    let accessToken = tencentOAuth.accessToken
    println("accessToken:\(accessToken)") //641B23508B62392C52D6DFADF67FAA9C
    getUserInfo()
}

//失败
func tencentDidNotLogin(cancelled: Bool) {
    println("登录失败了")
}

//无网络
func tencentDidNotNetWork() {
    println("没有网络")
}

4、获取用户信息

//第三步 获取用户信息
func getUserInfo(){
    SVProgressHUD.showWithStatus("正在获取用户信息...")
    tencentOAuth.getUserInfo()
}


//第四步 在获取用户回调中获取用户信息
func getUserInfoResponse(response: APIResponse!) { 
    SVProgressHUD.dismissWithSuccess("获取用户信息成功",afterDelay: 1)
    var dic:Dictionary = response.jsonResponse
    println("dic:\(dic)")

    //        [is_lost: 0,figureurl: http://qzapp.qlogo.cn/qzapp/222222/C5527A2F775D9EA7C20317128FAC202B/30,vip: 0,is_yellow_year_vip: 0,province: 北京,ret: 0,is_yellow_vip: 0,figureurl_qq_1: http://q.qlogo.cn/qqapp/222222/C5527A2F775D9EA7C20317128FAC202B/40,yellow_vip_level: 0,level: 0,figureurl_1: http://qzapp.qlogo.cn/qzapp/222222/C5527A2F775D9EA7C20317128FAC202B/50,city: 海淀,figureurl_2: http://qzapp.qlogo.cn/qzapp/222222/C5527A2F775D9EA7C20317128FAC202B/100,nickname: 竹中雨滴,msg:,gender: 男,figureurl_qq_2: http://q.qlogo.cn/qqapp/222222/C5527A2F775D9EA7C20317128FAC202B/100]
    refeshUserInfo(dic)
}


//第五步 刷新用户界面
func refeshUserInfo(dic : NSDictionary){
    let headimgurl: String = dic["figureurl_qq_2"] as! String
    let nickname: String = dic["nickname"] as! String 
    self.headerImg.sd_setImageWithURL(NSURL(string: headimgurl))
    self.nicknameLbl.text = nickname
}

5、跳转

func application(application: UIApplication,openURL url: NSURL,annotation: AnyObject?) -> Bool {
    return TencentOAuth.HandleOpenURL(url)
}

func application(application: UIApplication,handleOpenURL url: NSURL) -> Bool {
    return TencentOAuth.HandleOpenURL(url)
}

四、微博

1、注册

func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.

    WeiboSDK.registerApp(kAppKey)

    return true
}

2、授权登录

func sendBtnClick(sneder:UIButton){
    sendSinaAuthRequest()
}

//第一步  微博登录
func sendSinaAuthRequest(){
    var request : WBAuthorizeRequest = WBAuthorizeRequest.request() as! WBAuthorizeRequest
    request.redirectURI = kRedirectURI
    request.scope = "all"
    request.userInfo = ["SSO_Key":"SSO_Value"]
    WeiboSDK.sendRequest(request)
}

3、回调

func didReceiveWeiboRequest(request: WBBaseRequest!) {

}

func didReceiveWeiboResponse(response: WBBaseResponse!) {
    if response.isKindOfClass(WBAuthorizeResponse){
        if (response.statusCode == WeiboSDKResponseStatusCode.Success) {
            var authorizeResponse : WBAuthorizeResponse = response as! WBAuthorizeResponse
            var userID = authorizeResponse.userID
            var accessToken = authorizeResponse.accessToken
            println("userID:\(userID)\naccessToken:\(accessToken)")
            var userInfo = response.userInfo as Dictionary
            NSNotificationCenter.defaultCenter().postNotificationName("SINA_CODE",object: nil,userInfo: userInfo)
        }
    }
}

4、获取用户信息

//第二步 通过通知得到登录后获取的用户信息
func onRecviceSINA_CODE_Notification(notification:NSNotification)
{
    SVProgressHUD.showSuccessWithStatus("获取到用户信息",duration: 1)

    var userinfoDic : Dictionary = notification.userInfo!

    println("userInfo:\(userinfoDic)")


    /* userID:2627289515 accessToken:2.002BqnrCyY87OC80500cab28Ofqd3B userInfo: [uid: 2627289515,remind_in: 647057,scope: invitation_write,refresh_token: 2.002BqnrCyY87OC10f7877765yPietB,app: { logo = "http://ww1.sinaimg.cn/square/65745bf7jw1ea399us692j2028028glf.jpg"; name = "SDK\U5fae\U535a\U5e94\U7528demo"; },access_token: 2.002BqnrCyY87OC80500cab28Ofqd3B,expires_in: 647057 ] */

    var userAppInfo: Dictionary<String,String> = userinfoDic["app"] as! Dictionary

    refeshUserInfo(userAppInfo)
}

//第三步 刷新用户界面
func refeshUserInfo(dic : NSDictionary){

    let headimgurl: String = dic["logo"] as! String
    let nickname: String = dic["name"] as! String

    self.headerImg.sd_setImageWithURL(NSURL(string: headimgurl))
    self.nicknameLbl.text = nickname
}

5、跳转

func application(application: UIApplication,annotation: AnyObject?) -> Bool {
    return WeiboSDK.handleOpenURL(url,delegate: self)
}

func application(application: UIApplication,handleOpenURL url: NSURL) -> Bool {
    return WeiboSDK.handleOpenURL(url,delegate: self)
}

五、对比分析

1、demo情况

微博demo代码工整度完爆微信，QQ，看着很舒服，心情也不错；另外微博放在了github上面，适合pod管理，注释也极好，微信文档写的挺不错，QQ写的简直丧心病狂，需要极度耐心才能看明白，表示很无语，另外本三种方式授权登录的源代码有偿提供，如需可以邮件mmw05@163.com即可；

2、嵌入时间

微信算是很容易嵌入SDK，QQ也还可以，微博需要注意boundID有限制，微信的逻辑算是比较冗余繁琐，从授权到获取到用户信息需要很多接口，而QQ和微博可以直接从授权登陆回调中获取到，是比较便捷的，从上面代码可以看出来；

后记

从objective-C到Swift，苹果力求简约，但又不简单，现代化的语言，必然在性能各方面优于传统，只是需要时间和更多的考验，作为开发者，多一个选择，岂不更好！
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