新浪授权认证(不用SDK)

微博开放平台：http://open.weibo.com/

微博开放接口的调用，如发微博、关注等，都是需要获取用户身份认证的。目前微博开放平台用户身份鉴权主要采用的是OAuth2.0。另外，为了方便开发者开发、测试自己的应用，我们还提供了Basic Auth的身份鉴权方式，但Basic Auth仅适用于应用所属的开发者自己调用接口。

1.获取新浪的登录页面（UIWebView）

2.用户输入得到状态码（code）

3.用code换令牌 Token

#import "ViewController.h"

#define kAppKey @""微博注册应用之后得到

#define kAppSecret @""微博注册应用之后得到

#define kRedirect_url @"https://www.baidu.com"

#define kAccessTokenKey @"kAccessTokenKey"

#define kExpiresTime @"kExpiresTime"

#define kUserID @"kUserID"

@interface ViewController ()<UIWebViewDelegate>

@property (strong,nonatomic) UIWebView * webView;

@end

@implementation ViewController

- (IBAction)Login:(UIButton *)sender {

//1.使用oauth2/authorize发起请求

//拼接网址

NSString * urlString = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/authorize?client_id=%@&redirect_uri=%@",kAppKey,kRedirect_url];

NSURL * url = [NSURL URLWithString:urlString];

//创建请求

NSURLRequest * request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:60];

//创建页面

self.webView = [[UIWebView alloc]initWithFrame:self.view.bounds];

_webView.delegate = self;

[self.view addSubview:_webView];

//加载

[_webView loadRequest:request];

}

- (IBAction)Logout:(UIButton *)sender {

NSUserDefaults * userDefault = [NSUserDefaults standardUserDefaults];

[userDefault setObject:nil forKey:kAccessTokenKey];

[userDefault setObject:nil forKey:kExpiresTime];

[userDefault setObject:nil forKey:kUserID];

[userDefault synchronize];

}

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{

//return YES 加载 return NO 不加载

//2.获取code状态码

NSRange range = [[request.URL relativeString]rangeOfString:@"code="];

if (range.length != 0 ) {

//解析code

NSString * code = [[request.URL relativeString]substringFromIndex:range.location+range.length];//截取出来

[self.webView removeFromSuperview];//获取到就不需要了

NSLog(@"%@",code);

//3.换取令牌

//发送Post请求

NSURL * url =[NSURL URLWithString:@"https://api.weibo.com/oauth2/access_token"];

NSMutableURLRequest * upRequest = [NSMutableURLRequest requestWithURL:url];//用POST而不是用GET

[upRequest setHTTPMethod:@"POST"];

NSURLSession * session =[NSURLSession sharedSession];

NSString * dataString = [NSString stringWithFormat:@"client_id=%@&client_secret=%@&grant_type=authorization_code&code=%@&redirect_uri=%@&",kAppKey,kAppSecret,code,kRedirect_url];

NSData * updata = [dataString dataUsingEncoding:NSUTF8StringEncoding];

NSURLSessionUploadTask * upLoadTask = [session uploadTaskWithRequest:upRequest fromData:updata completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

NSDictionary * dataDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];//用字典封装json数据

NSLog(@"%@",dataDic);

//我们要用的---access_token  expires_in  uid

NSString * accesstoken = [dataDic objectForKey:@"access_token"];

NSString * expiresin = [dataDic objectForKey:@"expires_in"];

NSString * uid = [dataDic objectForKey:@"uid"];

//保存下来

NSUserDefaults * userDefault = [NSUserDefaults standardUserDefaults];

[userDefault setObject:accesstoken forKey:kAccessTokenKey];

[userDefault setObject:expiresin forKey:kExpiresTime];

[userDefault setObject:uid forKey:kUserID];

[userDefault synchronize];

}];

[upLoadTask resume];

return NO;

}else{

return YES;

}

}