iOS开发中的远程推送实现(最新，支持iOS9)

#import "AppDelegate.h"  
  
@implementation AppDelegate  
@synthesize mainView = _mainView;  
  
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions  
{  
    if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)])  
    { 
//由于ios8的推送跟ios7及以下的不一样，所以需要加判断来注册消息推送。

//IOS8  
        //创建UIUserNotificationSettings，并设置消息的显示类类型  
        UIUserNotificationSettings *notiSettings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge | UIUserNotificationTypeAlert | UIRemoteNotificationTypeSound) categories:nil];  
          
        [application registerUserNotificationSettings:notiSettings];  
          
    } else{ // ios7  
        [application registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge                                       |UIRemoteNotificationTypeSound                                      |UIRemoteNotificationTypeAlert)];  
    }  
      
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];  
    // Override point for customization after application launch.  
    self.window.backgroundColor = [UIColor whiteColor];  
    [self.window makeKeyAndVisible];  
      
    self.mainView = [[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];  
    self.window.rootViewController = self.mainView;  
    return YES;  
}  
  
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)pToken{  
    NSLog(@"---Token--%@", pToken);  
}  
  //会接收来自苹果服务器给你返回的deviceToken，然后你需要将它添加到你本地的推送服务器上。（很重要，决定你的设备能不能接收到推送消息）。
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo{  
      
    NSLog(@"userInfo == %@",userInfo);  
    NSString *message = [[userInfo objectForKey:@"aps"]objectForKey:@"alert"];  
      
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil nil];  
      
    [alert show];  
}  
  //这个函数则是当设备接收到来自苹果推送服务器的消息时触发的，用来显示推送消息。
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error{  
  
    NSLog(@"Regist fail%@",error);  
}  
  
- (void)applicationWillResignActive:(UIApplication *)application  
{  
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.  
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.  
}  
  
- (void)applicationDidEnterBackground:(UIApplication *)application  
{  
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.   
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.  
}  
  
- (void)applicationWillEnterForeground:(UIApplication *)application  
{  
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.  
}  
  
- (void)applicationDidBecomeActive:(UIApplication *)application  
{  
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.  
}  
  
- (void)applicationWillTerminate:(UIApplication *)application  
{  
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.  
}  
  
@end