如何根據iOS版本處理推送通知？

Question

對於iOS7，解析處理推送通知，在AppDelegate中下面的代碼：

[application registerForRemoteNotificationTypes: 
UIRemoteNotificationTypeBadge| 
UIRemoteNotificationTypeAlert| 
UIRemoteNotificationTypeSound]; 

registerForRemoteNotificationTypes在iOS8上不支持然而，和用於處理現在iOS8上的推送通知新的代碼如下所示：

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

在iOS7設備上使用此新代碼會導致應用程序崩潰，因此我需要讓代碼確定手機的版本，然後運行相應的推送通知代碼。我如何讓應用程序檢查這個，並使用正確的？

Answer 1

重複它總是更好地檢查的方法的可用性，而不是操作系統版本。

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)]; 
} 

假設您的部署目標> = 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)]; 
}