我是在 iOS 中处理连接的初学者。我想对 url 执行 POST 请求和 GET 请求。问题是我需要先进行 POST，这样我才能获得一个以 JSON 格式解析的访问令牌，该令牌稍后将放置在 GET 请求的标头中，这样我就可以检索我需要的登录数据。我正在使用自定义委托方法，但是当我运行它时，GET 请求比 POST 更早执行，因此在 GET 完成之前我无法获取密钥。有什么方法可以先执行 POST 再执行 GET 吗？这是我的代码：
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
//params
self.user = @"carlos";
self.pass = @"1234";
self.grantType = @"password";
self.clientId = @"7da713e69afc96cf894e";
self.clientSecret = @"2c14ec54cfdfd6faec4ef56ca7f0870ab83f820b";
// Set the side bar button action. When it's tapped, it'll show up the sidebar.
self.sideBarButton.target = self.revealViewController;
self.sideBarButton.action = @selector(revealToggle:);
// Set the gesture
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
[self httpPostWithCustomDelegate];
[self sendHTTPGet];
}
-(void) httpPostWithCustomDelegate
{
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];
NSURL * url = [NSURL URLWithString:@"http://192.237.241.175:8090/oauth2/access_token/"];
NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:url];
NSString * params =[NSString stringWithFormat:@"&username=%@&password=%@&grant_type=%@&client_id=%@&client_secret=%@&scope=write",self.user,self.pass,self.grantType,self.clientId,self.clientSecret];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
NSURLSessionDataTask * dataTask =[defaultSession dataTaskWithRequest:urlRequest
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"Retrieving Data");
// NSLog(@"Response:%@ %@\n", response, error);
if(error == nil)
{
//Test Display
// NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
// NSLog(@"Data = %@",text);
self.responseDataPost = [[NSMutableData alloc] init];
[self.responseDataPost appendData:data];
NSError *error;
NSMutableDictionary *receivedData = [NSJSONSerialization JSONObjectWithData:self.responseDataPost options:NSJSONReadingMutableContainers error:&error];
//obtener del dictionary el access token y meter como header Authorization Bearer + id
//NSArray *accessToken = [receivedData valueForKeyPath:@"access_token"];
self.connTxtPost.text = [receivedData valueForKeyPath:@"access_token"];
self.recData = [receivedData valueForKeyPath:@"access_token"];
}
}];
[dataTask resume];
}
-(void) sendHTTPGet
{
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: self delegateQueue: [NSOperationQueue mainQueue]];
NSURL * url = [NSURL URLWithString:@"http://192.237.241.175:8090/snippets/"];
NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:url];
[urlRequest setHTTPMethod:@"GET"];
self.connTxtGet.text = self.recData ;
[urlRequest setValue:self.recData forHTTPHeaderField:@"Authorization"];
NSURLSessionDataTask * dataTask =[defaultSession dataTaskWithRequest:urlRequest
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//NSLog(@"Response:%@ %@\n", response, error);
if(error == nil)
{
NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
NSLog(@"Data = %@",text);
}
}];
[dataTask resume];
}