IOS8 PUSH

registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later

// IOS8 新系统需要使用新的代码咯
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
{
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings
     settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge)
categories:nil]];

// [[UIApplication sharedApplication] registerForRemoteNotifications];不需要在这写
}
else
{
//这里还是原来的代码
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
     (UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)];
}

加方法（在iphone 6上不加下面方法developer收不到）：

- (void) application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings{//ios8.0 以上

[application registerForRemoteNotifications];

}

原本在IOS7当中判断PUSH是否打开的方法是：
UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
return (types & UIRemoteNotificationTypeAlert);

如果将这段代码使用在 IOS当中，虽然不会出现crash的现象，但是基本没什么作用。
在IOS8中，我们使用如下的新代码来取代以上的代码

{
UIRemoteNotificationType types;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
   {
types = [[UIApplication sharedApplication] currentUserNotificationSettings].types;
    }
else
   {
types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
    }

return (types & UIRemoteNotificationTypeAlert);
}