[iOS微博项目 - 2.2] - 在app中获取授权

github: https://github.com/hellovoidworld/HVWWeibo

 

A.发送授权请求

1.使用UIWebView加载请求页面

自定义一个继承UIViewController的HVWOAuthViewController

 //
 //  HVWOAuthViewController.m
 //  HVWWeibo
 //
 //  Created by hellovoidworld on 15/2/4.
 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
 //

 #import "HVWOAuthViewController.h"

 @interface HVWOAuthViewController ()

 @end

 @implementation HVWOAuthViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view.

     // 创建UIWebView
     UIWebView *webView = [[UIWebView alloc] init];
     webView.frame = self.view.bounds;

     // 添加到主界面
     [self.view addSubview:webView];

     // 加载请求页面
     NSURL *url = [NSURL URLWithString:@"https://api.weibo.com/oauth2/authorize?client_id=3942775926&redirect_uri=http://www.cnblogs.com/hellovoidworld/"];
     NSURLRequest *request = [NSURLRequest requestWithURL:url];
     [webView loadRequest:request];
 }

 @end

把这个控制器作为window的根控制器运行测试：

AppDelegate:

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // Override point for customization after application launch.

     // 启动后显示状态栏
     UIApplication *app = [UIApplication sharedApplication];
     app.statusBarHidden = NO;

     // 设置window
     self.window = [[UIWindow alloc] init];
     self.window.frame = [UIScreen mainScreen].bounds;

     self.window.rootViewController = [[HVWOAuthViewController alloc] init];
     [self.window makeKeyAndVisible];

     return YES;
 }

2.使用UIWebView代理拦截发送url动作，发送授权请求之后发送的url就带有access_code

 /** 截取web发送请求 */
 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {

     NSString *urlStr = request.URL.absoluteString;
     NSRange range = [urlStr rangeOfString:@"http://www.cnblogs.com/hellovoidworld/?code="];
     if (range.length > ) { // 如果是匹配的url，即发送的是带access_code的url
         // 截取access_code
         NSUInteger accessCodeLocation = range.length + range.location;
         NSString *accessCode = [urlStr substringFromIndex:accessCodeLocation];

         HVWLog(@"%@", accessCode);

         return NO; // 阻止发送，不需要跳转到重定向页面
     }

     return YES; // 其他情况照常发送
 }

Output:

5bef5308ba902cc52d9f2dc34bbfdd1c

注意这个access_code每次都不一样的

3.获取access_token

（1）获取access_token的请求API，发送POST请求

（2）使用AFN框架来发送post请求

 /** 根据access_code获取access_token */
 - (void) accessTokenWithAccessCode:(NSString *) accessCode {
     // 创建AFN的http操作请求管理者
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     // 参数设置
     NSMutableDictionary *param = [NSMutableDictionary dictionary];
     param[@"client_id"] = @"";
     param[@"client_secret"] = @"cc577953b2aa3aa8ea220fd15775ea35";
     param[@"grant_type"] = @"authorization_code";
     param[@"code"] = accessCode;
     param[@"redirect_uri"] = @"http://www.cnblogs.com/hellovoidworld/";

     // 发送请求
     [manager POST:@"https://api.weibo.com/oauth2/access_token" parameters:param success:^(AFHTTPRequestOperation *operation, NSDictionary *accountInfo) {
         [MBProgressHUD hideHUD];

         // 返回的是用户信息字典
         HVWLog(@"%@", accountInfo);

     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         [MBProgressHUD hideHUD];

         HVWLog(@"请求access_token失败 ----> %@", error);
     }];

 }

（3）由于新浪返回的json数据Content-Type是 text/plain，但是AFNetworking框架默认的json序列化器不能识别，所以要修改一下json序列化器的acceptableContentType

 - (instancetype)init {
     self = [super init];
     if (!self) {
         return nil;
     }

     self.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/plain", nil];

     return self;
 }

Output:

{
    "access_token" = "2.00A5GpAGGIUpSEff44478fe90yykBw";
    "expires_in" = 181897;
    "remind_in" = 181897;
    uid = 5508976272;

}

（4）保存返回的用户信息到沙盒

        // 返回的是用户信息字典
        // 存储用户信息，包括access_token到沙盒中
        NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
        NSString *filePath = [docPath stringByAppendingPathComponent:@"accountInfo.plist"];

        [accountInfo writeToFile:filePath atomically:YES];