iOS开发之路--微博OAuth授权_取得用户授权的accessToken

//// OauthViewController.m// 20_帅哥no微博//// Created by beyond on 14-8-5.// Copyright (c) 2014年 com.beyond. All rights reserved.// 授权控制器,仅运行一次,取得了当前用户的access_token和uid之后,存档,切换窗口的主控制器#import "OauthViewController.h"@interface OauthViewController ()<UIWebViewDelegate>{  // 成员变量记住,不同方法中要用到  UIWebView *_webView;}@end@implementation OauthViewController-(void)loadView{  // 直接让WebView成为控制器的view,避免再次添加  _webView = [[UIWebView alloc]init];  self.view = _webView;}- (void)viewDidLoad{  [super viewDidLoad];    // 设置代理为当前控制器,以便监听webView的开始加载 和结束 加载  _webView.delegate = self;    // 申请认证的地址  NSString *oauthURL = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/authorize?client_id=%@&response_type=code&redirect_uri=%@",kAppKey,kRedirectURL];    // 调用分类的方法,加载申请认证的网址  [_webView loadURLString:oauthURL];}#pragma mark - 代理 方法// 开始加载- (void)webViewDidStartLoad:(UIWebView *)webView{  log(@"真的开始加载--%@",webView.request.URL);  // 一开始加载就,显示进度条  MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:webView animated:YES];  hud.labelText = @"页面加载中...";}// 是否开始加载某个页面- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{  log(@"能否加载--%@",webView.request.URL);  return YES;}// 页面加载完成- (void)webViewDidFinishLoad:(UIWebView *)webView{  log(@"加载完毕--%@",webView.request.URL);  // 一旦加载完毕,就隐藏进度条  [MBProgressHUD hideAllHUDsForView:webView animated:YES];      // 用户同意授权之后,返回的URL包含授权的request_code,形如: http://www.abc.com/?code=888888888888  // 返回了用户授权的request_code的页面之后,需要截取code,然后继续拼接url,发起第3次请求(这次必须以POST方式),最终返回需要的access_token    NSString *reDirectURLContainsCode = _webView.request.URL.absoluteString;  // 分类方法,从左边标记字串的最后面开始,截取剩下的字符串  NSString *code = [reDirectURLContainsCode subStrFromLeftFlagStr:@"?code="];  //如果 不是返回code的url,不做任何事情  if (code == nil) return;    // 现在准备发起最后一次请求,拼接第3次请求的需要的URL,本次请求返回的东东,才会是最重要的用户的accessToken,也包含了用户的uid  NSString *accessTokenRequestURLStr = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/access_token?client_id=%@&client_secret=%@&grant_type=authorization_code&redirect_uri=%@&code=%@",kAppKey,kAppSecret,kRedirectURL,code];      // 1,创建URL  NSURL *accessTokenRequestURL = [NSURL URLWithString:accessTokenRequestURLStr];  // 2,创建post请求  NSMutableURLRequest *mutRequest = [[NSMutableURLRequest alloc]initWithURL:accessTokenRequestURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];  //设置请求方式为POST，默认为GET  [mutRequest setHTTPMethod:@"POST"];    // 3,连接服务器,并接收返回的数据  NSData *receivedData = [NSURLConnection sendSynchronousRequest:mutRequest returningResponse:nil error:nil];  // 将服务器返回的数据转成字串(实质是JSON数据)  NSString *responseStr = [[NSString alloc]initWithData:receivedData encoding:NSUTF8StringEncoding];  log(@"Response json is :%@",responseStr);      // 4,从responseStr中(实质是JSON数据)获取到access_token  // 将(JSON数据)转成字典先  NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableContainers error:nil];    // 通过键,取到access_token  NSString *access_token = [dictionary objectForKey:@"access_token"];  log(@"access token is:%@",access_token);  // 通过键,取到用户的uid  NSString *uid = [dictionary objectForKey:@"uid"];  log(@"uid is:%@",uid);    // 授权成功,切换根控制器到主控制器  UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@"授权成功" delegate:nil cancelButtonTitle:@"取消" destructiveButtonTitle:@"确定" otherButtonTitles: nil];  [actionSheet showInView:self.view.window];}@end

{  "access_token":"这个才是真正的ACCESS_TOKEN",  "remind_in":"157679999",  "expires_in":157679999,  "uid":"授权了的那个用户的uid"}