Objective C：如何使用HTTP POST上传图像和文本

使用Objective C进行HTTP POST请求是一种常见的方法，可以用于上传图像和文本数据。在本文中，我们将学习如何通过HTTP POST请求上传图像和文本数据，并提供一个示例代码来演示这一过程。

objective-c
NSString *boundary = @"---------------------------14737809831466499882746641449";
NSURL *url = [NSURL URLWithString:@"http://example.com/upload"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary] forHTTPHeaderField:@"Content-Type"];
NSMutableData *body = [NSMutableData data];
// 添加图像数据
NSData *imageData = UIImageJPEGRepresentation(image, 0.7);
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Disposition: form-data; name=\"image\"; filename=\"image.jpg\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
// 添加文本数据
NSString *textData = @"这是一段文本数据";
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"text\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[textData dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
// 添加结束标识符
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:body];
// 发送请求
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    if (error) {
        NSLog(@"上传失败：%@", error);
    } else {
        NSLog(@"上传成功");
    }
}];
[dataTask resume];