有什么方法可以猴子补丁或混淆NSArray（或其他类集群）吗？ [英] Is there any way to monkey-patch or swizzle an NSArray (or other Class Cluster)?

问题描述

今天，我正在一个项目中，我想为 NSArray 的所有实例别名另一种方法，并且认为这不会太困难并带有很好的老式方法。

Today I was working on a project in which I wanted to "alias" an alternative method for all instances of NSArray, and didn't think it would be too difficult with some good old-fashioned method swizzling.

我爆发了 JRSwizzle 和…

[NSArray jr_swizzleMethod：@selector（objectAtIndex :) withMethod：@selector（objectAtIndex_accordingToMe :) error：nil];

要清楚，我将其与 NSArray 上的相应类别配对，这是一个名为 objectAtIndex_accordingToMe的实例方法：。

To be clear, I paired this with the appropriate category on NSArray, an instance method called objectAtIndex_accordingToMe:.

但是，我只是在相同的旧索引下获得了相同的旧对象。叹。最终，我发现尽管没有抛出任何错误-我由于 NSArray 是一个类集群

However, I was just getting that same old object, at that same old index. Sigh. Ultimately, I figured out that despite not throwing any errors - I'm not going to achieve these results due to the fact that NSArray is a class cluster

我想我的问题更多是不愿意接受这个确实尝试覆盖 NSArray 方法的尽头。我的意思是，这是 NSArray ..人们必须想弄清楚它，不是吗？一个人会认为，苹果的基础课程将成为遍地开花的人的主要目标！

I guess my question is more of an unwillingness to accept that "this" is really the end of the road trying to override NSArray methods. I mean, come on this is NSArray.. people must wanna muck around with it, no? One would think that Apple's foundation classes would be a prime target for swizzlers, everywhere!

因此，有一种方法可以更改，别名， monkey-patch ，覆盖或以其他方式使用…NSArray等（无子类化）？

So, is there a way to alter, alias, monkey-patch, override, or otherwise have your way with… an NSArray, etc. (without subclassing)?

推荐答案

大概您有一个需要此行为的特定数组。不管它是什么，都可以获取该实例的类对象，并轻松对其进行处理：

Presumably you have a particular array for which you'd like this behavior. You can get that instance's class object, no matter what it is, and swizzle that quite easily:

[[myArray class] jr_swizzleMethod:@selector(objectAtIndex:) withMethod:@selector(objectAtIndex_accordingToMe:) error:nil];

也只有少数几个 NSArray ：

NSArray * trees = [NSArray array];
NSArray * birds = [NSArray arrayWithObjects:@"Albatross", @"Budgerigar", @"Cardinal", nil];
NSMutableArray * dogs = [NSMutableArray arrayWithObjects:@"Airedale", @"Beagle", @"Collie", nil];

NSLog(@"%@ %@ %@", [trees class], [birds class], [dogs class]);

前两个我们得到 __ NSArrayI __ NSArrayM 第三，所以可能（这是非常易碎），您可以使用运行时函数来捕获类对象名称：

We get __NSArrayI for the first two and __NSArrayM for the third, so potentially (this is very fragile) you could use a runtime function to grab the class object by name:

[objc_getClass("__NSArrayI") jr_swizzleMethod:@selector(objectAtIndex:) withMethod:@selector(objectAtIndex_accordingToMe:) error:nil];

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