Objective-C中的拦截方法调用 [英] Intercept method call in Objective-C

问题描述

我可以在Objective-C中拦截方法调用吗?怎么样?

Can I intercept a method call in Objective-C? How?

修改: Mark Powell 的回答为我提供了部分解决方案，即 -forwardInvocation 方法. 但是文档指出-forwardInvocation仅在向对象发送没有相应方法的消息时才被调用.我希望在所有情况下都可以调用一种方法，即使接收者确实具有该选择器.

Mark Powell's answer gave me a partial solution, the -forwardInvocation method. But the documentation states that -forwardInvocation is only called when an object is sent a message for which it has no corresponding method. I'd like a method to be called under all circumstances, even if the receiver does have that selector.

推荐答案

您可以通过混淆方法调用来做到这一点.假设您想获取NSTableView的所有版本:

You do it by swizzling the method call. Assuming you want to grab all releases to NSTableView:

static IMP gOriginalRelease = nil;
static void newNSTableViewRelease(id self, SEL releaseSelector, ...) {
   NSLog(@"Release called on an NSTableView");
   gOriginalRelease(self, releaseSelector);
}


  //Then somewhere do this:
  gOriginalRelease = class_replaceMethod([NSTableView class], @selector(release), newNSTableViewRelease, "v@:");

您可以在Objective C运行时

You can get more details in the Objective C runtime documentation.

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