iOS：如何执行HTTP POST请求？

问题描述

我正在接近iOS开发，我想让我的第一个应用程序之一执行HTTP POST请求。

I'm approaching iOS development and I'd like to have one of my first applications to perform a HTTP POST request.

据我所知，我应该管理通过 NSURLConnection 对象处理请求的连接，这会强制我有一个委托对象，而该对象又会处理数据事件。

As far as I can understand, I should manage the connection which handles the request via a NSURLConnection object, which forces me to have a delegate object, which in turn will handle data events.

有人可以通过一个实际例子澄清任务吗？

Could someone please clarify the task with a practical example?

我应该联系https端点发送身份验证数据（用户名和密码）和获取纯文本回复。

I should contact an https endpoint sending authentication data (username and password) and getting back a plain text response.

推荐答案

您可以按如下方式使用NSURLConnection：

You can use NSURLConnection as follows:

1. 设置 NSURLRequest ：使用 requestWithURL：（NSURL *）theURL 初始化请求。

1. Set your NSURLRequest: Use requestWithURL:(NSURL *)theURL to initialise the request.

如果您需要指定POST请求和/或HTTP标头，请使用 NSMutableURLRequest with

If you need to specify a POST request and/or HTTP headers, use NSMutableURLRequest with

• （void）setHTTPMet hod：（NSString *）方法


• （void）setHTTPBody：（NSData *）data


• （void）setValue：（NSString *）值为HTTPHeaderField：（NSString *）字段

• (void)setHTTPMethod:(NSString *)method
• (void)setHTTPBody:(NSData *)data
• (void)setValue:(NSString *)value forHTTPHeaderField:(NSString *)field

使用 NSURLConnection 发送您的请求：

Send your request in 2 ways using NSURLConnection:

• 同步：（NSData *）sendSynchronousRequest：（NSURLRequest *）请求returningResponse：（NSURLResponse **）响应错误：（NSError） **）错误

这将返回一个可以处理的 NSData 变量。

This returns a NSData variable that you can process.

重要提示：请记住在单独的线程中启动同步请求以避免阻止UI。

IMPORTANT: Remember to kick off the synchronous request in a separate thread to avoid blocking the UI.

异步：（无效）开始

不要忘记设置NSURLConnection的委托来处理连接，如下所示：

Don't forget to set your NSURLConnection's delegate to handle the connection as follows:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [self.data setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)d {
    [self.data appendData:d];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    [[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error", @"")
                                 message:[error localizedDescription]
                                delegate:nil
                       cancelButtonTitle:NSLocalizedString(@"OK", @"")
                       otherButtonTitles:nil] autorelease] show];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSString *responseText = [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding];

    // Do anything you want with it

    [responseText release];
}

// Handle basic authentication challenge if needed
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
    NSString *username = @"username";
    NSString *password = @"password";

    NSURLCredential *credential = [NSURLCredential credentialWithUser:username
                                                             password:password
                                                          persistence:NSURLCredentialPersistenceForSession];
    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}

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