iOS开发中第三方登录方式之微信登录

1、在微信开放平台注册开发者账号，创建应用提交审核，审核通过过，获得相应的AppID和AppSecret。

2、下载iOS微信SDK。

3、导入微信SDK到工程，手动和自动都可以。

4、添加系统依赖库

“SystemConfiguration.framework”;

“CoreTelephony.framework”;

“libsqlite3.0.tbd”;

“libstdc++.tbd”;

“libz.tbd”;

"libWeChatSDK.a"

5、ios9需要设置白名单并设置其它

在info.plist文件中加入 LSApplicationQueriesSchemes

TARGETS ->info ->URL type-> 添加URL type

Identifier 填写：可自定义

URL Scheme填写：wx1234567

6、iOS9默认使用https,现在先还原成http请求方式

第一步：在plist中添加NSAppTransportSecurity项，此项为NSDictionary

第二步：在NSAppTransportSecurity下添加 NSAllowsArbitraryLoads类型为Boolean，value为YES

7、向微信App程序注册第三方应用，并在第三方应用实现从微信App返回

#import "WXApi.h"
//微信开发者ID
#define URL_APPID @"app id"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//向微信注册应用。
[WXApi registerApp:URL_APPID withDescription:@"wechat"];
return YES;
}
#pragma mark - iOS9之前的代理设置
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
if ([[url absoluteString] hasPrefix:@"tencent"]) {
return [TencentOAuth HandleOpenURL:url];
}else {
return [WXApi handleOpenURL:url delegate:self];
}
}
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{
if ([[url absoluteString] hasPrefix:@"tencent"]) {
return [TencentOAuth HandleOpenURL:url];
}else {
return [WXApi handleOpenURL:url delegate:self];
}
}
#pragma mark - iOS9之后的代理设置
-(BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<NSString *,id> *)options{
if ([[url absoluteString] hasPrefix:@"tencent"]) {
return [TencentOAuth HandleOpenURL:url];
}else {
return [WXApi handleOpenURL:url delegate:self];
}
}

8、请求授权登录微信，第三方移动应用会在App本地拉起微信应用进行授权登录，微信用户确认后微信将拉起第三方移动应用，并带上授权临时票据（code）

《a》AppDelegate.m文件实现代码：

// 微信登录触发按钮

- (IBAction)wechatLoginClick:(id)sender {
if ([WXApi isWXAppInstalled]) {
SendAuthReq *req = [[SendAuthReq alloc] init];
req.scope = @"snsapi_userinfo";
req.state = @"App";
[WXApi sendReq:req];
}
else {
[self setupAlertController];
}
}

#pragma mark - <WXApiDelegate>

// 微信回调，不管是登录还是分享成功与否，都是走这个方法发送一个sendReq后，收到微信的回应

1. -(void) onResp:(BaseResp*)resp{
NSLog(@"resp %d",resp.errCode);
/*
enum WXErrCode {
WXSuccess = 0, 成功
WXErrCodeCommon = -1, 普通错误类型
WXErrCodeUserCancel = -2, 用户点击取消并返回
WXErrCodeSentFail = -3, 发送失败
WXErrCodeAuthDeny = -4, 授权失败
WXErrCodeUnsupport = -5, 微信不支持
};
*/
if ([resp isKindOfClass:[SendAuthResp class]]) { //授权登录的类。
if (resp.errCode == 0) { //成功。
//这里处理回调的方法。通过代理吧对应的登录消息传送过去。
if ([_wxDelegate respondsToSelector:@selector(loginSuccessByCode:)]) {
SendAuthResp *resp2 = (SendAuthResp *)resp;
[_wxDelegate loginSuccessByCode:resp2.code];
}
}else{ //失败
NSLog(@"error %@",resp.errStr);
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"登录失败" message:[NSString stringWithFormat:@"reason : %@",resp.errStr] delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil nil];
[alert show];
}
}
}

《b》 ViewController.m 文件实现代码：

#import "WXApi.h"
#import "AppDelegate.h"
//微信开发者ID
#define URL_APPID @"appid"
#define URL_SECRET @"app secret"
#import "AFNetworking.h"

#pragma mark - 微信登录触发事件
- (IBAction)weixinLoginAction:(id)sender {
if ([WXApi isWXAppInstalled]) {
SendAuthReq *req = [[SendAuthReq alloc]init];
req.scope = @"snsapi_userinfo";
req.openID = URL_APPID;
req.state = @"1245";
appdelegate = [UIApplication sharedApplication].delegate;
appdelegate.wxDelegate = self;
[WXApi sendReq:req];
}else{
//把微信登录的按钮隐藏掉。
}
}

#pragma mark - 微信登录回调
-(void)loginSuccessByCode:(NSString *)code{
NSLog(@"code %@",code);
__weak typeof(*&self) weakSelf = self;
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];//请求
manager.responseSerializer = [AFHTTPResponseSerializer serializer];//响应
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/html",@"application/json", @"text/json",@"text/plain", nil nil];
//通过 appid secret 认证code . 来发送获取 access_token的请求
[manager GET:[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/oauth2/access_token?appid=%@&secret=%@&code=%@&grant_type=authorization_code",URL_APPID,URL_SECRET,code] parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { //获得access_token，然后根据access_token获取用户信息请求。
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
NSLog(@"dic %@",dic);
/*
access_token 接口调用凭证
expires_in access_token接口调用凭证超时时间，单位（秒）
refresh_token 用户刷新access_token
openid 授权用户唯一标识
scope 用户授权的作用域，使用逗号（,）分隔
unionid 当且仅当该移动应用已获得该用户的userinfo授权时，才会出现该字段
*/
NSString* accessToken=[dic valueForKey:@"access_token"];
NSString* openID=[dic valueForKey:@"openid"];
[weakSelf requestUserInfoByToken:accessToken andOpenid:openID];
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
NSLog(@"error %@",error.localizedFailureReason);
}];
}
-(void)requestUserInfoByToken:(NSString *)token andOpenid:(NSString *)openID{
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[manager GET:[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/userinfo?access_token=%@&openid=%@",token,openID] parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
NSDictionary *dic = (NSDictionary *)[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
NSLog(@"dic ==== %@",dic);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
NSLog(@"error %ld",(long)error.code);
}];
}