[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 > 0) { // 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"] = @"3942775926";
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];