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我知道Apple支持在後臺模式下運行的應用程序,我想要做的是發送http請求以從服務器獲取數據,然後爲用戶提供一些通知,並且我想要在幾次使用timmer期間重複此操作。我正在使用XCode-3.2.4和Iphone4.1模擬器,它支持後臺運行,但是當我向我的服務器發出http請求時,沒有調用響應函數。任何人都可以幫助我如何做到這一點?請。 這樣的代碼:當應用程序在後臺時無法從服務器獲取響應 - iOS4
- (void)applicationDidEnterBackground:(UIApplication *)application{
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Do the work associated with the task.
responseData = [[NSMutableData data] retain];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.unpossible.com/misc/lucky_numbers.json"]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
});
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[responseData setLength:0];
NSLog(@"%@",@"Server responded");
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
NSLog(@"%@",@"Server transfered data");
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@"%@",[NSString stringWithFormat:@"Connection failed: %@", [error description]]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
NSLog(@"%@",@"Server transfered data");
UIApplication* app = [UIApplication sharedApplication];
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}