Objective-C 中的简单 http post 示例

使用Objective-C进行HTTP POST请求是一种常见的操作，它允许我们向服务器发送数据并接收响应。在本文中，我们将介绍如何使用Objective-C进行简单的HTTP POST请求，并提供一个示例代码来帮助我们更好地理解这个过程。

objective-c
NSString *urlString = @"https://example.com/api";
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
NSString *postData = @"username=testuser&password=testpassword";
NSData *data = [postData dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];

objective-c
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    // 响应开始时调用，可以在这里初始化接收到的数据
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    // 接收到数据时调用，可以在这里将接收到的数据拼接起来
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    // 数据接收完成时调用，可以在这里处理接收到的数据
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    // 请求失败时调用，可以在这里处理错误
}

objective-c
NSString *urlString = @"https://example.com/api";
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
NSString *postData = @"username=testuser&password=testpassword";
NSData *data = [postData dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    // 处理响应和错误
    if (error) {
        NSLog(@"请求失败，错误信息：%@", error.localizedDescription);
    } else {
        // 处理接收到的数据
        NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"接收到的数据：%@", responseString);
    }
}];
[dataTask resume];