Xcode debugger does not display the value of my variables.

Q:  The debugger doesn't show my variables' value. How can I view them?

A: The debugger may not show the value of your variables for any of the following reasons:

• The Optimization level is not set to None for the Debug configuration.

  Be sure to set it to None for Objective-C apps as shown in Figure 1 and for Swift apps as shown in Figure 2.

• The Build Configuration pop-up menu is set to Release in the scheme editor's Run action settings pane.

  In Xcode, open the scheme editor by choosing Product > Scheme > Edit Scheme…, select the Run action for your app in the scheme actions pane, then set Build Configuration to Debug as seen in Figure 3.

Document Revision History