Swift 3和Xcode 8.2中的用户通知的条件编译 [英] Conditional Compilation for User Notifications in Swift 3 and Xcode 8.2

问题描述

我们有一个支持iOS 9+的应用程序，该应用程序正在Swift 3和Xcode 8.2.x中开发.iOS 10引入了一种注册推送通知的新方法，描述得很好 #available 产生相似的结果

定位通用/真实设备时就是这种情况.该应用程序将针对模拟器进行编译.

解决方案

根据上面的评论，您需要运行时检查，而不是条件编译，而 #available 正是这样.

这对我来说很好:

 如果#available(iOS 10.0，*){UNUserNotificationCenter.current().requestAuthorization(选项:[.badge，.alert，.sound]){(已授予，错误)在}}别的 {UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(类型:[.badge，.sound，.alert]，类别:nil))} 

UIUserNotificationSettings 在iOS 10中已弃用，但实际上仍然存在.苹果通常不会删除API，直到很长一段时间不推荐使用它们.

我怀疑您还有其他构建问题.让我烦恼的是:您是否正确设置了Base SDK和Deployment Target?

We have an application supporting iOS 9+, that is being developed in Swift 3 and Xcode 8.2.x. iOS 10 introduced a new method for registering for push notifications, described well in this post. Since iOS 9 doesn't know about the User Notifications framework, we want to use the iOS 9 method when the device is iOS 9, and use the UserNotifications.framework on iOS 10. In Objective C, we would accomplish this via conditional compilation (e.g. #ifdef statements).

In Swift 3, there is some facility for conditional compilation #available and #if. We try to wrap the branches of notification registration code in either of these directives, and the app will not compile. #available generates similar results

This is the case when targeting generic/real devices. The app will compile against simulators.

解决方案

Based on your comments above, you want a runtime check, not conditional compilation, and #available is precisely that.

This works fine for me:

if #available(iOS 10.0, *) {
    UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .alert, .sound]) {
        (granted, error) in
    }
}
else {
    UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.badge, .sound, .alert], categories: nil))
}

UIUserNotificationSettings is deprecated in iOS 10, but it's actually still there. Apple doesn't typically remove APIs until they've been deprecated for a very long time.

I suspect you have some other kind of build issue. Off the top of my head: do you have Base SDK and Deployment Target set correctly?

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