本文介绍了如何在“ objectAtIndex:”上设置断点XCode 4中特定类中特定属性的方法?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想在特定类中特定属性的 objectAtIndex:方法上设置符号断点。

I would like to set a symbolic breakpoint on "objectAtIndex:" method of a specific property in a specific class.

请参见以下代码:

@interface Foo
...
@property (strong,nonatomic) NSMutableArray *fooArray;
...
@end

我尝试了以下操作:


  • -[[Foo fooArray] objectAtIndex:]

  • -[Foo :: fooArray objectAtIndex:]

  • -[Foo :: fooArray objectAtIndex]

  • Foo :: fooArray :: objectAtIndex:

  • Foo :: fooArray :: objectAtIndex

  • Foo :: fooArray :: objectAtIndex()

  • -[[Foo fooArray] objectAtIndex:]
  • -[Foo::fooArray objectAtIndex:]
  • -[Foo::fooArray objectAtIndex]
  • Foo::fooArray::objectAtIndex:
  • Foo::fooArray::objectAtIndex
  • Foo::fooArray::objectAtIndex()

这些解决方案均无效。

任何

推荐答案

经过一番挖掘,我找到了解决之道。

After some digging, I found a way to work this out. That's kinda ugly.

这涉及到在第一个断点触发的命令中动态创建条件断点。

It involves creating a conditional breakpoint dynamically, in a command triggered by a first breakpoint.

首先,只要您的fooArray准备好就中断。我选择了 fooArray 访问器,但可以更早完成:

First, break whenever your fooArray is ready. I settled on the fooArray accessor, but it could be done earlier :


断点集--name-[Foo fooArray]

然后,想要的是<$在此特定数组对象上调用c $ c> objectAtIndex:。首先让我们将其指针放在变量中:

Then, what you want is break when objectAtIndex: is called on this specific array object. First let's put its pointer in a variable :


expr id $ watch = self-> _fooArray

,然后在以下条件下使用此变量创建新的断点:

and then create a new breakpoint, using this variable in the condition :


断点集--name-[__ NSArrayI objectAtIndex:]-条件 $ rdi == $ watch


  • $ rdi 包含 self x86_64 。在ARM上使用 $ r0 。 (请参阅Clark Cox的。)
  • 永远不会调用
  • -[NSArray objectAtIndex:] 。如Peter所述,NSArray是一个类集群,而您的数组实际上是 __ NSArrayI

  • $rdi contains self, at least on x86_64. Use $r0 on ARM. (See Clark Cox's great post on the topic.)
  • -[NSArray objectAtIndex:] is never called. As Peter mentioned, NSArray is a class cluster, and your array is actually an __NSArrayI.

或者,在Xcode中:

Or, in Xcode :

(不要忘记选中继续框。)

(Don't forget to check the "continue" box.)

这不是真的漂亮,但似乎可以用!

It's not really beautiful, but it seems to work !

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06-27 05:08