如何根据iOS版本处理推送通知？

Question

对于iOS7，解析处理推送通知，在AppDelegate中下面的代码：

[application registerForRemoteNotificationTypes: 
UIRemoteNotificationTypeBadge| 
UIRemoteNotificationTypeAlert| 
UIRemoteNotificationTypeSound]; 

registerForRemoteNotificationTypes在iOS8上不支持然而，和用于处理现在iOS8上的推送通知新的代码如下所示：

UIUserNotificationSettings *settings = 
[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | 
UIUserNotificationTypeBadge | 
UIUserNotificationTypeSound 
            categories:nil]; 
[[UIApplication sharedApplication] registerUserNotificationSettings:settings]; 
[[UIApplication sharedApplication] registerForRemoteNotifications]; 

在iOS7设备上使用此新代码会导致应用程序崩溃，因此我需要让代码确定手机的版本，然后运行相应的推送通知代码。我如何让应用程序检查这个，并使用正确的？

Answer 1

重复它总是更好地检查的方法的可用性，而不是操作系统版本。

if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerForRemoteNotifications)]) { 

    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil]; 

    [[UIApplication sharedApplication] registerUserNotificationSettings:settings]; 

    [[UIApplication sharedApplication] registerForRemoteNotifications]; 

} else { 

    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)]; 
} 

假设您的部署目标> = 7.0。

Answer 2

可能的registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) 
{ 
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]]; 
    [[UIApplication sharedApplication] registerForRemoteNotifications]; 
} 
else 
{ 
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes: 
    (UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)]; 
}