微博API调用

#import "ViewController.h"
#define kAppKey @"706003107"
#define kAppSecret @"53b3f1774f9a050e1d4931bab3b55633"
#define kRedirect_url @"www.baidu.com"
#define kAccessTokenKey @"kAccessTokenKey"
#define kExpiresTimeKey @"kExpiresTimeKey"
#define kUserIDKey @"kUserIDKey"
@interface ViewController ()<UIWebViewDelegate>
@property (nonatomic,strong) UIWebView *webView;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    }
- (IBAction)loginDidClicked:(id)sender {
    //使用oAuth的oauth2发起请求,拼接网址，，参数开始用？，&连接不同的参数，
    NSString *urlString = [NSString stringWithFormat:@"https://api.weibo.com/oauth2/authorize?client_id=%@&redirect_uri=%@",kAppKey,kRedirect_url];
    
    NSURL *url = [NSURL URLWithString:urlString];
    //发送请求-创建session
//    NSURLSession *session = [NSURLSession sharedSession];
    //创建请求,网页
    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:60];
    
    //使用UIWebView加载页面
    self.webView = [[UIWebView alloc]initWithFrame:self.view.bounds];
    
    _webView.delegate = self;
    [self.view addSubview:_webView];
    [_webView loadRequest:request];
}

- (IBAction)logout:(id)sender {
    NSUserDefaults *useDefaults = [NSUserDefaults standardUserDefaults];
    [useDefaults setObject:nil forKey:kAccessTokenKey];
    [useDefaults setObject:nil forKey:kExpiresTimeKey];
    [useDefaults setObject:nil forKey:kUserIDKey];
    [useDefaults synchronize];

}

#pragma mark ---------------
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    //目标获取code的状态码 解决方案，对即将加载的request对应的URL进行解析，一旦URL里面包含code=，那么就停止
    NSRange range = [[request.URL relativeString]rangeOfString:@"code="];
    if (range.length!=0) {
        //说明此刻即将请求的request里面包含了code,解析code后面的内容，
        NSString *code = [[request.URL relativeString]substringFromIndex:range.location+range.length];
        //将界面webView 删掉
        [self.webView removeFromSuperview];
        //使用code去换取一个accessToken,解决方案，想服务器发送一个post请求
        NSURL *url = [NSURL URLWithString:@"https://api.weibo.com/oauth2/access_token"];
        //创建一个可变的请求
        NSMutableURLRequest *upRequest = [NSMutableURLRequest requestWithURL:url];
        //设置请求的方式为post
        [upRequest setHTTPMethod:@"POST"];
        //创建session
        NSURLSession *session = [NSURLSession sharedSession];
        //准备上传的数据,将上传的参数拼接成一个字符串
        NSString *dataString = [NSString stringWithFormat:@"client_id=%@&client_secret=%@&grant_type=authorization_code&code=%@&redirect_uri=%@",kAppKey,kAppSecret,code,kRedirect_url];
        //将字符串转化为NSdata
        NSData *upData = [dataString dataUsingEncoding:NSUTF8StringEncoding];
        //创建一个uploadTask
        NSURLSessionUploadTask *upLoadTask = [session uploadTaskWithRequest:upRequest fromData:upData completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            //NSDATA    转化为NSDictionary
            NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
            NSLog(@"%@",resultDic);
            //保存access_token,expires_in uid
            NSString *accessToken = [resultDic objectForKey:@"access_token"];
            NSString *expiresIn = [resultDic objectForKey:@"expires_in"];
            NSString *uid = [resultDic objectForKey:@"uid"];
            NSUserDefaults *useDefaults = [NSUserDefaults standardUserDefaults];
            [useDefaults setObject:accessToken forKey:kAccessTokenKey];
            [useDefaults setObject:expiresIn forKey:kExpiresTimeKey];
            [useDefaults setObject:uid forKey:kUserIDKey];
            [useDefaults synchronize];
        }];
        [upLoadTask resume];
        return NO;
    }else{
     return YES;
    }
}

@end