//// OauthViewController.m// 20_帥哥no微博//// Created by beyond on 14-8-5.// Copyright (c) 2014年 com.beyond. All rights reserved.// 授權(quán)控制器,僅運(yùn)行一次,取得了當(dāng)前用戶的access_token和uid之后,存檔,切換窗口的主控制器#import "OauthViewController.h"@interface OauthViewController (){  // 成員變量記住,不同方法中要用到  UIWebView *_webView;}@end@implementation OauthViewController-(void)loadView{  // 直接讓W(xué)ebView成為控制器的view,避免再次添加  _webView = [[UIWebView alloc]init];  self.view = _webView;}- (void)viewDidLoad{  [super viewDidLoad];    // 設(shè)置代理為當(dāng)前控制器,以便監(jiān)聽webView的開始加載 和結(jié)束 加載  _webView.delegate = self;    // 申請認(rèn)證的地址  NSString *oauthURL = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/authorize?client_id=%@&response_type=code&redirect_uri=%@",kAppKey,kRedirectURL];    // 調(diào)用分類的方法,加載申請認(rèn)證的網(wǎng)址  [_webView loadURLString:oauthURL];}#pragma mark - 代理 方法// 開始加載- (void)webViewDidStartLoad:(UIWebView *)webView{  log(@"真的開始加載--%@",webView.request.URL);  // 一開始加載就,顯示進(jìn)度條  MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:webView animated:YES];  hud.labelText = @"頁面加載中...";}// 是否開始加載某個頁面- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{  log(@"能否加載--%@",webView.request.URL);  return YES;}// 頁面加載完成- (void)webViewDidFinishLoad:(UIWebView *)webView{  log(@"加載完畢--%@",webView.request.URL);  // 一旦加載完畢,就隱藏進(jìn)度條  [MBProgressHUD hideAllHUDsForView:webView animated:YES];      // 用戶同意授權(quán)之后,返回的URL包含授權(quán)的request_code,形如: http://www.abc.com/?code=888888888888  // 返回了用戶授權(quán)的request_code的頁面之后,需要截取code,然后繼續(xù)拼接url,發(fā)起第3次請求(這次必須以POST方式),最終返回需要的access_token    NSString *reDirectURLContainsCode = _webView.request.URL.absoluteString;  // 分類方法,從左邊標(biāo)記字串的最后面開始,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;    // 現(xiàn)在準(zhǔn)備發(fā)起最后一次請求,拼接第3次請求的需要的URL,本次請求返回的東東,才會是最重要的用戶的accessToken,也包含了用戶的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,創(chuàng)建URL  NSURL *accessTokenRequestURL = [NSURL URLWithString:accessTokenRequestURLStr];  // 2,創(chuàng)建post請求  NSMutableURLRequest *mutRequest = [[NSMutableURLRequest alloc]initWithURL:accessTokenRequestURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];  //設(shè)置請求方式為POST，默認(rèn)為GET  [mutRequest setHTTPMethod:@"POST"];    // 3,連接服務(wù)器,并接收返回的數(shù)據(jù)  NSData *receivedData = [NSURLConnection sendSynchronousRequest:mutRequest returningResponse:nil error:nil];  // 將服務(wù)器返回的數(shù)據(jù)轉(zhuǎn)成字串(實(shí)質(zhì)是JSON數(shù)據(jù))  NSString *responseStr = [[NSString alloc]initWithData:receivedData encoding:NSUTF8StringEncoding];  log(@"Response json is :%@",responseStr);      // 4,從responseStr中(實(shí)質(zhì)是JSON數(shù)據(jù))獲取到access_token  // 將(JSON數(shù)據(jù))轉(zhuǎn)成字典先  NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableContainers error:nil];    // 通過鍵,取到access_token  NSString *access_token = [dictionary objectForKey:@"access_token"];  log(@"access token is:%@",access_token);  // 通過鍵,取到用戶的uid  NSString *uid = [dictionary objectForKey:@"uid"];  log(@"uid is:%@",uid);    // 授權(quán)成功,切換根控制器到主控制器  UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@"授權(quán)成功" delegate:nil cancelButtonTitle:@"取消" destructiveButtonTitle:@"確定" otherButtonTitles: nil];  [actionSheet showInView:self.view.window];}@end

{  "access_token":"這個才是真正的ACCESS_TOKEN",  "remind_in":"157679999",  "expires_in":157679999,  "uid":"授權(quán)了的那個用戶的uid"}