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Setting breakpoints to pause your running app | Apple Developer Documentation

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When you identify a place in your source code where you want to investigate a bug, set a breakpoint to pause the debugger so you can inspect your variables and step through your code to isolate the bug. To locate crashes or other bugs where it is difficult to know where to set a breakpoint, use symbolic or issue breakpoints to pause on specific problem conditions and quickly identify where a bug occurs. For bugs that occur after several iterations or only under certain circumstances, specify conditions on your breakpoint. If you want to log information at specific points in your app or receive notifications when a line of code executes, use breakpoint actions. Navigate to a line in your code where you want execution to pause, then click the gutter or line number in the source editor to set a breakpoint. Xcode displays a breakpoint icon to indicate the location. Drag a breakpoint up or down to move it to another location; drag it away from the gutter to remove it. Click the breakpoint i

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