如何有条件地遵守委托协议?

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问题描述

如果我在iOS项目中包括仅在(例如)iOS 9中可用的框架，但我仍在支持iOS 8，如何根据iOS版本有条件地遵守委托协议?例如，我知道我可以有条件地包括这样的框架:

If I am including frameworks in my iOS project that are only available in (for example) iOS 9, but I am still supporting iOS 8, how do I conditionally conform to a delegate protocol depending on the iOS version? For example, I understand I can include the framework conditionally like this:

#import <Availability.h>
#ifdef __IPHONE_9_0
#import <Something/Something.h>
#endif

但是，如果该框架也需要符合委托协议怎么办?

But what if that framework also needs to conform to a delegate protocol?

@interface ExampleController()< UITextViewDelegate，SomethingDelegate>

如果我在iOS 9上，如何仅包含"SomethingDelegate"?

How do I only include "SomethingDelegate" if I'm on iOS 9?

谢谢！

推荐答案

嗯，大致相同:

@interface ExampleController () <UITextViewDelegate
#ifdef __IPHONE_9_0
     , SomethingDelegate
#endif
>

顺便说一句，这不是您应该检查设备是否正在运行iOS 9的方式-.

By the way, this is not the way you should check if the device is running iOS 9 - this only checks if your Xcode supports iOS 9.

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