如何根据对象字符串属性在 Xcode 中设置条件断点? [英] How to set a conditional breakpoint in Xcode based on an object string property?

问题描述

我希望能够在达到特定字符串匹配时让调试器中断.例如，我可能有这样的事情:

I'm looking to be able to have the debugger break when it reaches a particular string match. As an example, I might have something like this:

Foo myObj = [self gimmeObj];

myObj 可能有一个名为 name 的属性.我希望调试器在

myObj might have a property called name. I want the debugger to stop on the assignment when

[myObj.name isEqualToString:@"Bar"];

如何在 Xcode 中设置条件断点来执行此操作?

How can I set my conditional breakpoint in Xcode to do that?

推荐答案

你可以在 Xcode 中通过正常设置断点来设置条件断点，然后按住 Control 键单击它并选择 Edit Breakpoint(选择 Run -> Show ->断点).

You can set a conditional break point in Xcode by setting the breakpoint normally, then control-click on it and select Edit Breakpoint (choose Run -> Show -> Breakpoints).

在断点条目中，有一个条件列.

In the breakpoint entry, there is a Condition column.

现在，有几个问题需要记住.首先，gdb 不理解点语法，所以你必须使用 [myObj name] 代替 myObj.name(除非 name 是一个 ivar).

Now, there are several issues to keep in mind for the condition. Firstly, gdb does not understand dot syntax, so instead of myObj.name, you must use [myObj name] (unless name is an ivar).

接下来，与 gdb 中的大多数表达式一样，您必须告诉它返回结果的类型，即BOOL".所以设置一个条件，如:

Next, as with most expressions in gdb, you must tell it the type of return result, namely "BOOL". So set a condition like:

(BOOL)[[myObj name] isEqualToString:@"Bar"]

通常通过临时添加以下代码在代码中执行此操作实际上更容易:

Often it is actually easier to just do this in code by temporarily adding code like:

if ( [myObj.name isEqualToString:@"Bar"] ) {
    NSLog( @"here" );
}

然后在NSLog上设置断点.那么你的条件可以任意复杂，而不必担心gdb能解析什么，不能解析什么.

and then setting the break point on the NSLog. Then your condition can be arbitrarily complex without having to worry about what gdb can and can't parse.

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