Question

*注意这个问题不是如何在swift中注册远程通知，我的问题是如何在swift中编写代码，这些代码在运行iOS8和iOS7的设备上运行时都能正常工作。我发布的代码曾经使用Xcode beta 1到5做到这一点但是使用beta 6现在会生成链接器错误。所以我的问题是如何改变事物以解决beta 6中的新链接器错误。*

我在Xcode Beta 6中收到以下链接错误

Undefined symbols for architecture arm64:
"__TFSsoi1oUSs17_RawOptionSetType_USs21BitwiseOperationsTypeSs9Equatable__FTQ_Q__Q_", referenced from:
      __TFC12My_cWireless11AppDelegate29registerForRemoteNotificationfS0_FT_T_ in AppDelegate.o

对于以下用于在Betas 1到5上编译/链接/执行而没有问题的代码。

      func registerForRemoteNotification()
        {
            let registerForRemoteNotificationsMethodExists = UIApplication.sharedApplication().respondsToSelector(Selector("registerForRemoteNotifications"))
            if  registerForRemoteNotificationsMethodExists
            {
                UIApplication.sharedApplication()?.registerForRemoteNotifications()
            }
            else
            {
                // Fall back to using iOS7 as the code is not running on an iOS 8 device
 UIApplication.sharedApplication()?.registerForRemoteNotificationTypes(UIRemoteNotificationType.Badge | UIRemoteNotificationType.Sound | UIRemoteNotificationType.Alert)
            }
        }

为什么它停止与最新的Beta链接？使用Xcode Beta 6显示的代码是否有问题？

Answer 1

首先，检查iOS版本号。然后，分别为每个版本设置推送通知。我确实需要清洁＆＃39;我的构建文件夹以及使用opt-shift-cmd-K，因为Martin R建议解决链接错误。

这是我的最终代码：

// Check to see if this is an iOS 8 device.
let iOS8 = floor(NSFoundationVersionNumber) > floor(NSFoundationVersionNumber_iOS_7_1)
if iOS8 {
    // Register for push in iOS 8
    let settings = UIUserNotificationSettings(forTypes: UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound, categories: nil)
    UIApplication.sharedApplication().registerUserNotificationSettings(settings)
    UIApplication.sharedApplication().registerForRemoteNotifications()
} else {        
    // Register for push in iOS 7
    UIApplication.sharedApplication().registerForRemoteNotificationTypes(UIRemoteNotificationType.Badge | UIRemoteNotificationType.Sound | UIRemoteNotificationType.Alert)
}

检查iOS版本的参考 - http://www.andrewcbancroft.com/2014/09/17/swift-ios-version-check/

Answer 2

我在Objective-C中有类似的工作：

if (registerForRemoteNotificationsMethodExists) {
        [application registerForRemoteNotifications];
    } else {
        [application registerForRemoteNotificationTypes:
         UIRemoteNotificationTypeBadge|
         UIRemoteNotificationTypeAlert|
         UIRemoteNotificationTypeSound];
    }

这符合Xcode 6 B5。还没试过B6。

Answer 3

我相信这是在Swift 2中检查iOS版本的推荐方法：

    if #available(iOS 8.0, *) {
        application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil))
    } else {
        application.registerForRemoteNotificationTypes([UIRemoteNotificationType.Alert, UIRemoteNotificationType.Badge, UIRemoteNotificationType.Sound])
    }

如何在Swift中调用iOS7和iOS8的registerForRemoteNotifications？

3 个答案: