如何在iOS中发送Get请求？

Question

我正在制作一个库，以从具有指定数据和方法类型的特定 URL 获取响应。为此，我使用 url 发出请求。但是当我设置其方法类型时，它显示了 [NSURLRequest setHTTPMethod:] 中发送的无法识别的选择器异常 我将其设置为

[requestObject setHTTPMethod:@"GET"];

告诉我可能是什么问题。如果有的话也给我提供代码。

Answer 1

NSMutableURLRequest *request = 
[NSMutableURLRequest requestWithURL:[NSURL 
            URLWithString:serverAddress] 
            cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                                                   timeoutInterval:10
 ];

[request setHTTPMethod: @"GET"];

NSError *requestError = nil;
NSURLResponse *urlResponse = nil;


NSData *response1 =
        [NSURLConnection sendSynchronousRequest:request
                         returningResponse:&urlResponse error:&requestError];

Answer 2

NSString *getString = [NSString stringWithFormat:@"parameter=%@",yourvalue];
NSData *getData = [getString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

NSString *getLength = [NSString stringWithFormat:@"%d", [getData length]];

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];

[request setURL:[NSURL URLWithString:@"https:yoururl"]];

[request setHTTPMethod:@"GET"];

[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

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

[request setHTTPBody:getData];

self.urlConnection = [[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];

NSAssert(self.urlConnection != nil, @"Failure to create URL connection.");

// show in the status bar that network activity is starting
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

Answer 3

确保您的 requestObject 类型为 NSMutableURLRequest。

Answer 4

只需调用并使用：

(void)jsonFetch{

    NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/us/rss/topaudiobooks/limit=10/json"];

    NSURLSession *session = [NSURLSession sharedSession];

    NSURLSessionDataTask *data = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

        NSError *erro = nil;

        if (data!=nil) {

            NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&erro ];

            if (json.count > 0) {

                for(int i = 0; i<10 ; i++){

                    [arr addObject:[[[json[@"feed"][@"entry"] objectAtIndex:i]valueForKeyPath:@"im:image"] objectAtIndex:0][@"label"]];

                }

            }
        }
        dispatch_sync(dispatch_get_main_queue(),^{

            [table reloadData];
        });
    }];

    [data resume];
}