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Is there any way to track variable changes or memory changes in Xcode? I'm looking for functionality like Visual Studio's data breakpoint.
I want to know where my object's view frame is being changed. I want to set a breakpoint at a member variable and run it. Then I could determine where it's changed.
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There is 2 ways to watch a variable and break at certain condition. Control-click a breakpoint indicator to display a command menu and choose Edit Breakpoint to open the breakpoint editor and set conditions, add actions, and so forth, as mentioned in Breakpoints. Use LLDB command line.
LLDB is a debugging component used in the LLVM project which was developed by the LLVM developer group. Xcode uses the LLDB as the default debugging tool. The full form of LLDB is Low-level debugger. Breakpoints help a developer to stop the execution of the program at any point.
Print a variableClick the Add Action button and select Debugger Command. Put any print command in a debug console in a text field. Make sure you prefix it with po , e.g., po print(view) . Check Automatically continue after evaluating actions.
Xcode uses gdb (or lldb, but that's another story) to implement its debugging functionality. gdb has the ability to set hardware watchpoints and hence so does Xcode.
This is a useful page for generic debugging of memory errors. Xcode's debugging console window is really just a gdb shell, you can type in commands as you please. The ever-helpful Quinn Taylor explains how to do so in this related post.
If you'd rather avoid interacting with gdb directly, you can right-click a variable in Xcode's debugging window and select "Watch Variable". Xcode will then alert you whenever your variable's value has been changed.
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