导航控制器中的“后退”按钮上的应用程序崩溃

Question

I have a table in my view controller (navigation controller). It contains 5 rows. When I click on one 3rd row, a new view controller is pushed onto the stack. This new controller also contains a table view and the cells in that table view contains text fields (added using cell.contentView addSubView:). On clicking one of the text field, a picker is shown (using textField.inputView) instead of keyboard. Now, without selecting any item in picker, I click on back button, then my view gets popped. But after a while (when I am on my root view controller), the app gets crashed.

But If I click on a text field (which is showing keyboard), and then press back button; no crash occurs. So, what might be the problem??

Answer 1

Looks like you have some bug in your logic. Try to Build and debug and see in debugger(run-debugger) stack of calling functions.

Answer 2

If you use a pointer without initializing it to nil or any other object, you are propably going to end up accessing memory which isn't yours. this type of code will also give an EXC_BAD_ACCESS error , that means you are truing to use memory which is not yours. so first trace your code using break points line by line.