How to display the exact line of code causing application crash in xcode 4 debugger like in xcode 3.2?

You need to add an exception breakpoint. Select the Breakpoint Navigator, click the Add (+) button at the bottom, then choose Add Exception Breakpoint... This should cause the debugger to pause any time it encounters an exception. Note, you have to have the Breakpoints button enabled (to the right of the Scheme selector in the toolbar).

Note also, in Xcode 4, Run with breakpoints enabled is synonymous with "Build and Debug" in previous versions.

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