在iOS 8中要求获得本地通知的权限，但仍然拥有iOS 7应用程序支持 [英] Ask for Permission for Local Notifications in iOS 8, but still have the App Support iOS 7

问题描述

我有一个使用本地通知的应用。在iOS 7中，一切正常，但在iOS 8中，应用程序需要请求用户显示通知的权限。要在iOS 8中请求权限，我正在使用：

I have an app which uses local notifications. In iOS 7 everything works fine, but in iOS 8 the app needs to ask for user permission to display notifications. To ask for permission in iOS 8 I'm using:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{
  [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
}

它在Xcode 6和iOS 8中运行正常。当我打开它时在Xcode 5中的项目，错误是语义问题。 使用未声明的标识符'UIUserNotificationSettings'。

It works fine in Xcode 6 and in iOS 8. When I open the same project in Xcode 5, the error is a Semantic Issue. "Use of undeclared identifier 'UIUserNotificationSettings'."

如何让应用程序与iOS 7及更高版本配合使用？ 8，并在两个版本上正常通知。

How can I get the app to work with iOS 7 & 8, and have the notifications work properly on both versions.

推荐答案

以下答案做了一些假设：

The following answer makes a few assumptions:

1. 当使用Xcode 6时，应用必须使用iOS 8的Base SDK正确构建，并且在使用Xcode 5时必须使用iOS 7的Base SDK正确构建。


2. 应用程序必须支持iOS 7（或更早版本）的部署目标，无论Base SDK和Xcode版本如何。

代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // None of the code should even be compiled unless the Base SDK is iOS 8.0 or later
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000
    // The following line must only run under iOS 8. This runtime check prevents
    // it from running if it doesn't exist (such as running under iOS 7 or earlier).
    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
        [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
    }
#endif
}

所有这些都包括在内在Apple SDK兼容性指南。

All of this is covered in the Apple SDK Compatibility Guide.

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