第三方登陆：微信官方登陆

 <key>NSAppTransportSecurity</key>

     <dict>

        <key>NSAllowsArbitraryLoads</key>

             <true/>

    </dict>

<key>LSApplicationQueriesSchemes</key>

<array>

<string>weixin</string>

<string>wechat</string>

</array>

//
//  AppDelegate.h
//  WeiXinLogin
//
//  Created by 王园园 on 16/6/26.
//  Copyright © 2016年 Wangyuanyuan. All rights reserved.
//

#import <UIKit/UIKit.h>

#import "WXApi.h"

@protocol WXDelegate <NSObject>

- (void)loginSuccessByCode:(NSString *)code;

@end


@interface AppDelegate : UIResponder <UIApplicationDelegate,WXApiDelegate>

@property (strong, nonatomic) UIWindow *window;

///声明微信代理属性
@property (nonatomic,assign)id<WXDelegate>wxDelegate;


@end

//
//  AppDelegate.m
//  WeiXinLogin
//
//  Created by 王园园 on 16/6/26.
//  Copyright © 2016年 Wangyuanyuan. All rights reserved.
//

#import "AppDelegate.h"

#define weixinLoginAppId         @""
#define weixinLoginAppSecret     @""

@interface AppDelegate ()


@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    //向微信注册APPID
    [WXApi registerApp:weixinLoginAppId withDescription:@"wechat"];
    
    return YES;
}

#pragma mark - 微信登陆
/*! @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。
 */
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    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
{
//    [[NSNotificationCenter defaultCenter]postNotificationName:@"weixinNoticationAboutLogin" object: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];
            [alert show];
        }
    }
    
    
}
@end

//
//  ViewController.m
//  WeiXinLogin
//
//  Created by 王园园 on 16/6/26.
//  Copyright © 2016年 Wangyuanyuan. All rights reserved.
//

#import "ViewController.h"
#import "WXApi.h"

#import "AppDelegate.h"

#define weixinLoginAppId         @""
#define weixinLoginAppSecret     @""

@interface ViewController ()<WXDelegate>

@property (nonatomic,strong)AppDelegate *appDelegate;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    
    
    //在微信开发者平台：应用管理中心/移动应用   获取AppID
    UIButton *weiXinLoginBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [weiXinLoginBtn setTitle:@"微信登陆" forState:UIControlStateNormal];
    weiXinLoginBtn.backgroundColor = [UIColor cyanColor];
    [weiXinLoginBtn addTarget:self action:@selector(weiXinLoginButtonAction) forControlEvents:UIControlEventTouchUpInside];
    weiXinLoginBtn.frame = CGRectMake(100, 100, 100, 100);
    [self.view addSubview:weiXinLoginBtn];
    
    
}


#pragma mark - 登陆按钮的响应方法
- (void)weiXinLoginButtonAction{
    //解决isWXAppInstalled的值不准确，需要iOS9白名单适配：https://github.com/ChenYilong/iOS9AdaptationTips#常见-url-scheme
    
    if ([WXApi isWXAppInstalled])
    {
        //构造SendAuthReq结构体
        SendAuthReq* req =[[SendAuthReq alloc ] init] ;
        
        req.scope = @"snsapi_userinfo";
        req.openID = weixinLoginAppId;
        req.state = @"1245";
        _appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
        _appDelegate.wxDelegate = self;
        //第三方向微信终端发送一个SendAuthReq消息结构
        [WXApi sendReq:req];
        

    }else{
        
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"您没有安装微信，是否去下载" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        }];
        
        UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        }];
        
        // Add the actions.
        [alertController addAction:cancelAction];
        [alertController addAction:otherAction];
        
        [self presentViewController:alertController animated:YES completion:nil];
        
    }
}

#pragma mark - 此方法是，当用户点击允许授权之后，注册的通知的方法

//微信 成功回调
-(void)loginSuccessByCode:(NSString *)code{
    
    //第一步 得到code
    NSLog(@"code %@",code);

    
    //第二步 通过code获取access_token
    NSString * grantStr = @"grant_type=authorization_code";
    //通过code获取access_token  https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
    NSString * tokenUrl = @"https://api.weixin.qq.com/sns/oauth2/access_token?";
    NSString * tokenUrl1 = [tokenUrl stringByAppendingString:[NSString stringWithFormat:@"appid=%@&",weixinLoginAppId]];
    NSString * tokenUrl2 = [tokenUrl1 stringByAppendingString:[NSString stringWithFormat:@"secret=%@&",weixinLoginAppSecret]];
    NSString * tokenUrl3 = [tokenUrl2 stringByAppendingString:[NSString stringWithFormat:@"code=%@&",code]];
    NSString * tokenUrlend = [tokenUrl3 stringByAppendingString:grantStr];
    NSLog(@"%@",tokenUrlend);

    
    //请求:获取access_token 和 openid
    NSURL *url = [NSURL URLWithString:tokenUrlend];
    
    
    NSURLRequest * request = [[NSURLRequest alloc]initWithURL:url];
    
    __weak typeof(self)weakSelf = self;
    
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        
        
        //转换为字典
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        NSString * access_token     = [dic objectForKey:@"access_token"];
        //NSString * expires_in       = [dic objectForKey:@"expires_in"];
        //NSString * refresh_token    = [dic objectForKey:@"refresh_token"];
        NSString * openid           = [dic objectForKey:@"openid"];
        
        
        [weakSelf requestUserInfoByToken:access_token andOpenid:openid];

        
    }];
        
    
}

#pragma mark - 根据accessToken和openID获取用户信息

-(void)requestUserInfoByToken:(NSString *)token andOpenid:(NSString *)openID{
    
    //第三步：通过access_token得到昵称、unionid等信息
    NSString * userfulStr = [NSString stringWithFormat:@"https://api.weixin.qq.com/sns/userinfo?access_token=%@&openid=%@",token,openID];
    NSURL * userfulUrl = [NSURL URLWithString:userfulStr];
    
    
    NSURLRequest * userfulRequest = [[NSURLRequest alloc]initWithURL:userfulUrl];
    
    [NSURLConnection sendAsynchronousRequest:userfulRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        
        //转换为字典
        NSDictionary *userfulResultDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        
        NSString * weixinOpenid = [userfulResultDic objectForKey:@"openid"];
        
        NSString * unionidStr = [userfulResultDic objectForKey:@"unionid"];//每个用户所对应的每个开放平台下的每个应用是同一个唯一标识
        NSString * langue = [userfulResultDic objectForKey:@"language"];
        
        NSString * nickStr = [userfulResultDic objectForKey:@"nickname"];
        
        NSString * filePath = [userfulResultDic objectForKey:@"headimgurl"];
        
        NSString * gender = [userfulResultDic objectForKey:@"sex"];
        NSString *sex;
        if ([gender intValue] == 1) {
            sex = @"1";
        }else if ([gender intValue] == 2){
            sex = @"0";
        }
        
        NSString * province = [userfulResultDic objectForKey:@"province"];
        
        NSString * city = [userfulResultDic objectForKey:@"city"];
        
    }];
    
    

    
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end