iOS实现第三方微信登录方式实例解析(最新最全)

// 
// AppDelegate.m 
// weixinLoginDemo 
// 
// Created by 张国荣 on 16/6/20. 
// Copyright © 2016年 BateOrganization. All rights reserved. 
// 
#import "AppDelegate.h" 
#import "WXApi.h" 
//微信开发者ID 
#define URL_APPID @"app id" 
@end 
@implementation AppDelegate 
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
//向微信注册应用。 
[WXApi registerApp:URL_APPID withDescription:@"wechat"]; 
return YES; 
} 
-(BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<NSString *,id> *)options{ 
/*! @brief 处理微信通过URL启动App时传递的数据 
* 
* 需要在 application:openURL:sourceApplication:annotation:或者application:handleOpenURL中调用。 
* @param url 微信启动第三方应用时传递过来的URL 
* @param delegate WXApiDelegate对象，用来接收微信触发的消息。 
* @return 成功返回YES，失败返回NO。 
*/ 
return [WXApi handleOpenURL:url delegate:self]; 
} 
/*! 微信回调，不管是登录还是分享成功与否，都是走这个方法 @brief 发送一个sendReq后，收到微信的回应 
* 
* 收到一个来自微信的处理结果。调用一次sendReq后会收到onResp。 
* 可能收到的处理结果有SendMessageToWXResp、SendAuthResp等。 
* @param resp具体的回应内容，是自动释放的 
*/ 
-(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]; 
} 
} 
} 
@end

// 
// ViewController.m 
// weixinLoginDemo 
// 
// Created by 张国荣 on 16/6/20. 
// Copyright © 2016年 BateOrganization. All rights reserved. 
// 
#import "ViewController.h" 
#import "WXApi.h" 
#import "AppDelegate.h" 
//微信开发者ID 
#define URL_APPID @"appid" 
#define URL_SECRET @"app secret" 
#import "AFNetworking.h" 
@interface ViewController ()<WXDelegate> 
{ 
AppDelegate *appdelegate; 
} 
@end 
@implementation ViewController 
- (void)viewDidLoad { 
[super viewDidLoad]; 
// Do any additional setup after loading the view, typically from a nib. 
} 
#pragma mark 微信登录 
- (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); 
}]; 
} 
- (void)didReceiveMemoryWarning { 
[super didReceiveMemoryWarning]; 
// Dispose of any resources that can be recreated. 
} 
@end