@interface中的Objective-C特定iOS版本 [英] Objective-c specific iOS version in @interface

问题描述

我正在尝试实现Apple Pay，我尝试实现2种方法，一种用于iOS10，一种用于iOS11 +，

I am trying to implement Apple Pay, and I try to implement 2 methods one for iOS10 and one for iOS11+,

所以在我的实现中，我有:

So in my implementation I have:

-(void) paymentAuthorizationViewController
  (PKPaymentAuthorizationViewController *)controller
                                   didAuthorizePayment:(PKPayment *)payment
                                               handler:(void (^)(PKPaymentAuthorizationResult * _Nonnull))completion  API_AVAILABLE(ios(11.0))
        {
       self.completionResult = completion
            ...

- (void) paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller
                                    didAuthorizePayment:(PKPayment *)payment
                                             completion:(void (^)(PKPaymentAuthorizationStatus))completion 
            {
      self.completionStatus = completion
        ...

在我的界面中，我有:

@property (nonatomic, copy) void (^completionStatus)(PKPaymentAuthorizationStatus);
@property (nonatomic, copy) void (^completionResult)(PKPaymentAuthorizationResult *);

我遇到的问题是XCode在界面中给我以下警告:

The issue I have is XCode give me the following warning in the interface:

'PKPaymentAuthorizationResult' is only available on iOS 11.0 or newer

这是实现版本特定代码的正确方法吗?我可以在界面中指定特定于版本的代码吗?

Is it a correct way to implement version specific code? Can I specify version specific code in interfaces?

推荐答案

要使界面中的警告静音，您可以尝试添加API_AVAILABLE宏，如下所示: API_AVAILABLE(ios(11.0))声明的结尾.

To silent the warning in the interface you can try to add the API_AVAILABLE macros like this: API_AVAILABLE(ios(11.0)) at the end of the declaration.

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