Xcode 断点测试

Question

我在进行断点调试的时候newDemo was compiled with optimization - stepping may behave oddly; variables may not be available.这种错误.再然后进行打印

error: Couldn't materialize: couldn't get the value of variable self: variable not available
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression

这种错误.为什么会出现这种错误?

Answer 1

newDemo was compiled with optimization - stepping may behave oddly 说的是编译的时候做了优化，所以源代码和编译后的机器码没办法一一对应，断点调试使用机器码，对应不到，所以self变量找不到。

编译的时候不要选择 Release （发布）模式。