php - 如何在ios上从Web服务器加载数据

Question

我一直在研究如何将数据从 mysql 服务器加载到我的 ios 设备。我见过的大多数示例都向服务器发送变量（如用户名和密码），然后使用 POST 检索所需的信息。就我而言，我不需要向服务器发送任何信息，只需检索即可。

所以我的问题是，我需要使用 POST 来获取信息吗？

另外，我似乎在 php 部分找不到任何示例。我应该如何编码我的 php 文件以从我的数据库中的表中返回所有信息？抱歉，这听起来像是一个模糊的问题，但我似乎找不到任何例子。

非常感谢任何可以提供帮助的人！

Answer 1

你可以使用这样的东西：

 - (void)viewDidLoad
    {
        [super viewDidLoad];
        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
        NSURL *url = [NSURL URLWithString:__YOUR URL__];
        NSURLRequest *theRequest=[NSURLRequest requestWithURL:url
                                                  cachePolicy:NSURLRequestUseProtocolCachePolicy
                                              timeoutInterval:60.0];
        NSURLConnection *connection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
        if (connection) {
            self.rssData = [NSMutableData data];   
        } else {   
            NSLog(@"Connection failed");
        }
    }
    - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
        [self.rssData setLength:0];
     }

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



     - (void)connectionDidFinishLoading:(NSURLConnection *)connection {
        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];            
        NSString *result = [[NSString alloc] initWithData:self.rssData encoding:NSUTF8StringEncoding];
            NSLog(@"%@",result);   
        }

    - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
        NSLog(@"%@", error);
    }

希望对您有所帮助！

Answer 2

您还可以使用GET检索数据。

举个例子：

在.h

@interface WSHandler : NSObject <NSURLConnectionDelegate>
{
    NSMutableData *receivedData;
}

- (void)callWebService;
@end

以 .m 为单位：

- (void)callWebService
{   

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:WS_URL]];

    [request setHTTPMethod:@"GET"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    if (connection)
    {
        receivedData = nil;
    }
    else
    {
        DLog(@"Connection could not be established");
    }
}

#pragma mark - NSURLConnection delegate methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [receivedData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    if (!receivedData)
        receivedData = [[NSMutableData alloc] initWithData:data];
    else
        [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    DLog(@"***** Connection failed");

    receivedData=nil;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // do something with the data
    DLog(@"***** Succeeded! Received %d bytes of data",[receivedData length]);
    DLog(@"***** AS UTF8:%@",[[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding]);
}