iOS 8 推送通知声音不适用于此特定案例

Question

我在我的 V1 应用中启用了推送通知。但是，我在为推送通知注册设备时没有使用标志 UIUserNotificationTypeSound。

正如预期的那样，发送推送通知时没有播放任何声音。稍后当我添加此标志时，声音仅针对新安装播放，而不针对尽管重新注册但一直在使用 V1 的忠实用户播放。

声音在设置中默认保持关闭状态。

我可以通过编程方式解决这个问题吗？

Answer 1

查看本教程，适用于 2015 年 1 月 2 日的今天

https://documentation.appboy.com/Enabling_Message_Channels/Push_Notifications/iOS

iOS 8 以非向后兼容的方式更改了通知注册。虽然您需要支持 iOS 7 和 8(并且不接受使用 8 SDK 构建的应用程序)，但您可以检查您需要的选择器并有条件地为运行版本正确调用它们。

这是 UIApplication 上的一个类别，它将把这个逻辑隐藏在一个干净的界面后面，供您在 Xcode 5 和 Xcode 6 中使用。

标题:

//Call these from your application code for both iOS 7 and 8
//put this in the public header
@interface UIApplication (RemoteNotifications)

- (BOOL)pushNotificationsEnabled;
- (void)registerForPushNotifications;

@end
Implementation:

//these declarations are to quiet the compiler when using 7.x SDK
//put this interface in the implementation file of this category, so they are
//not visible to any other code.
@interface NSObject (IOS8)

- (BOOL)isRegisteredForRemoteNotifications;
- (void)registerForRemoteNotifications;

+ (id)settingsForTypes:(NSUInteger)types categories:(NSSet*)categories;
- (void)registerUserNotificationSettings:(id)settings;

@end

@implementation UIApplication (RemoteNotifications)

- (BOOL)pushNotificationsEnabled
{
    if ([self respondsToSelector:@selector(isRegisteredForRemoteNotifications)])
    {
        return [self isRegisteredForRemoteNotifications];
    }
    else
    {
        return ([self enabledRemoteNotificationTypes] & UIRemoteNotificationTypeAlert);
    }
}

- (void)registerForPushNotifications
{
    if ([self respondsToSelector:@selector(registerForRemoteNotifications)])
    {
        [self registerForRemoteNotifications];

        Class uiUserNotificationSettings = NSClassFromString(@"UIUserNotificationSettings");

        //If you want to add other capabilities than just banner alerts, you'll need to grab their declarations from the iOS 8 SDK and define them in the same way.
        NSUInteger UIUserNotificationTypeAlert   = 1 << 2;

        id settings = [uiUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert categories:[NSSet set]];            
        [self registerUserNotificationSettings:settings];

    }
    else
    {
        [self registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert];
    }
}

@end