如何處理推送通知（取決於iOS版本）？

Question

對於iOS7，Parse使用AppDelegate中的以下代碼處理了推送通知：

[application registerForRemoteNotificationTypes:
 UIRemoteNotificationTypeBadge|
 UIRemoteNotificationTypeAlert|
 UIRemoteNotificationTypeSound];

registerForRemoteNotificationTypes不iOS8上支持，但和用於處理推iOS8上的通知，現在看起來像這樣新的代碼：

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所使用的版本，並運行適當的推送通知代碼。 我如何讓該應用檢查此內容並使用正確的應用？

Answer 1

檢查方法的可用性總是比檢查OS版本更好。

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)];
}

假設您的部署目標是> = 7.0。

Answer 2

可能與iOS 8.0及更高版本中的registerForRemoteNotificationTypes：重復

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)];
}