Application Crash on QPickerElement on iPad

[shahjeet297]

Application crash when using QPickerElement on Modal view controller in popover on iPad and then endEditing for QuickDialog.

Solution: Need to add dealloc method to set picker delegates to nil to avoid sending messages to already deallocated objects.

• (void)dealloc { _pickerView.delegate = nil; _pickerView.dataSource = nil; _pickerView = nil; }