ConnectionWithRequest 在 iOS 9.0 中已弃用

Question

我想从主机下载一些项目，但现在收到警告： 'connectionWithRequest:delegate:'is deprecated in iOS9.0 - Use NSURLSession'

我到处搜索，但不幸的是我找不到任何解决方案。

你能帮助我吗？

我的代码如下所示：

- (void)downloadItems
{
    // Download the json file
    NSURL *jsonFileUrl = [NSURL URLWithString:@"http://myhost.com/test.php"];

    // Create the request
    NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileUrl];

    // Create the NSURLConnection
    [NSURLConnection connectionWithRequest:urlRequest delegate:self];
}

#pragma mark NSURLConnectionDataProtocol Methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // Initialize the data object
    _downloadedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the newly downloaded data
    [_downloadedData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // Create an array to store the locations
    NSMutableArray *_locations = [[NSMutableArray alloc] init];

    // Parse the JSON that came in
    NSError *error;
    NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];

    // Loop through Json objects, create question objects and add them to our questions array
    for (int i = 0; i < jsonArray.count; i++)
    {
        NSDictionary *jsonElement = jsonArray[i];

        // Create a new location object and set its props to JsonElement properties
        Location *newLocation = [[Location alloc] init];
        newLocation.idS = jsonElement[@"idStatistic"];
        newLocation.temp = jsonElement[@"temp"];
        newLocation.hum = jsonElement[@"hum"];
        newLocation.date_time = jsonElement[@"date_time"];

        // Add this question to the locations array
        [_locations addObject:newLocation];
    }

    // Ready to notify delegate that data is ready and pass back items
    if (self.delegate)
    {
        [self.delegate itemsDownloaded:_locations];
    }
}

Answer 1

将行替换NSURLConnection为：

 NSURLSession *session = [NSURLSession sharedSession];
    [[session dataTaskWithURL:jsonFileUrl
            completionHandler:^(NSData *data,
                                NSURLResponse *response,
                                NSError *error) {
                // handle response

            }] resume];