“no valid aps-environment entitlement found for application”

    <key>Entitlements</key>    <dict>        <key>application-identifier</key>        <string>7C57XDWF8L.com.xxx.appname</string>        <key>aps-environment</key>        <string>development</string>        <key>get-task-allow</key>        <true/>        <key>keychain-access-groups</key>        <array>            <string>7C57XDWF8L.*</string>        </array>    </dict>

[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge  | 

　　UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];

 [[UIApplication sharedApplication] unregisterForRemoteNotifications];

if([[UIApplication sharedApplication] enabledRemoteNotificationTypes]{ 　　[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge  | 

　　　　UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];}

//注册push服务- (void)application:(UIApplication *) application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *) deviceToken {    NSString *token = [[deviceToken description] stringByTrimmingCharactersInSet:　　　　[NSCharacterSet characterSetWithCharactersInString:@"<>"]]; //去掉"<>"

    token = [[token description] stringByReplacingOccurrencesOfString:@" " withString:@""];//去掉中间空格    NSLog(@"deviceToken: %@", token);}

//注册push服务失败- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {    NSLog(@"Error in registration for APNS. Error: %@", error);}

//接收到push消息- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {    NSLog(@"收到推送消息 ： %@",[[userInfo objectForKey:@"aps"] objectForKey:@"alert"]);    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"推送通知"                                                     message:[[userInfo objectForKey:@"aps"] objectForKey:@"alert"]                                                   delegate:self                                          cancelButtonTitle:@"关闭"                                          otherButtonTitles:@"更新状态",nil];    [alert show];    [alert release];}

注意：通过 application:didRegisterForRemoteNotificationsWithDeviceToken:获取到DeviceToken后需要推送给提供Push服务的Provider，Provider保存好此应用的uuid对应的token，以便在发送消息的时候使用。如何生成.NET所需证书的可以根据这里的步骤来做。二、Provider开发。可以通过apns-sharp这个开源库进行开发，另外还有很多相关的文章详细解说其开发原理，例如这几篇文章：Local and Push Notification Programming Guide: About Local Notifications and Push NotificationsLocal and Push Notification Programming Guide: Provider Communication with Apple Push Notification ServiceProgramming Apple Push Notification Services Apple Push Notification Service另外，还有PushMeBaby供XCode下开发测试的Provider。轉自：http://www.cnblogs.com/chenjunbiao/archive/2011/07/28/2119259.html