Databases
StackOverflow2013
Postsdbo
PO
 

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  1. PO
    primarykey
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    1. This table or related slice is empty.
    1. POUIApplicationWillEnterForegroundNotification get called more and more
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      1. PTQuestion
    1. PTAnswer
    1. USBrad Goss
    1. USBrad Goss
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
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      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    1. COI disagree with your suggestions. It's perfectly fine to register for the `UIApplicationWillEnterForegroundNotification` if you want a different object to be informed about the event. In fact, it can make a much better design. I agree with your assumption about the cause of the issue, though. The original poster must make sure to only add the view controller _once_ to the notification center and not every time the app comes to the foreground or goes to the background.
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      1. USOle Begemann
    2. COI really like this way using the NSNotifactionCenter because i can update the viewcontroller i want to update. I don't what you mean with adding it once to the notification center. Whats the best place to put in the nsnotification center. Actually it is in the view controller, could this be the problem? Should i put it to an own function? perhaps something which would only be called one time? do you have an suggestion for me?
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      1. USuser1175122
    3. COI see, using this approach is fine, I made a wrong assumption. You must ensure that you only call [[NSNotificationCenter defaultCenter] addObserver:...] once. So, maybe place this call in your controllers viewDidLoad: method, and make 100% sure that you remove the controller from the defaultCentre when the controller is destroyed (by using [[NSNotificationCenter defaultCenter] removeObserver:...]. Where are you currently calling [[NSNotificationCenter defaultCenter] addObserver:...]?
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      1. USBrad Goss
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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