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Re: iOS 7 - Overriding NSNavigationController
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Re: iOS 7 - Overriding NSNavigationController


  • Subject: Re: iOS 7 - Overriding NSNavigationController
  • From: Dave <email@hidden>
  • Date: Wed, 25 Sep 2013 19:31:19 +0100

On 25 Sep 2013, at 17:44, David Duncan <email@hidden> wrote:

> On Sep 21, 2013, at 5:14 AM, Dave <email@hidden> wrote:
>
>> On 20 Sep 2013, at 20:41, David Duncan <email@hidden> wrote:
>>
>>> If you are building with the iOS 7 SDK, wantsFullScreenLayout should not be consulted for your UI layout at all by the framework. The only thing I can imagine the original engineer wanted was to avoid having to set the flag to NO manually, and thus have it done automatically.
>>
>> It's because another part of the code relies on it for laying out its view. Is the effect of  wantsFullScreenLayout in iOS 6 described in detail somewhere? The best approach would to adapt the code to work on any iOS Version (well, 5, 6 and 7 in this case) without fiddling with wantsFullScreenLayout is this is possible?
>
> wantsFullScreenLayout is generally a flag to request that your view controller’s view be laid out underneath translucent elements (such as a translucent navigation bar or status bar). In practice its behavior is somewhat confusing and a bit arbitrary.
>
> Keep in mind that rather than overriding the getter, it would be simpler to just set the value as you desire in your view controller’s -init* methods.

This code was already there, I probably would have used the init method if I had written it, but, as it happens it works out well, since iOS 7 doesn't use (so therefore it never calls the getter or the setter) wantsFullScreenLayout, I do not need to check the version in these methods, so it is better compatibility wise, although, I doubt it was planned!

>>
>>> Of course even if you build with the iOS 7 SDK and deploy to iOS 6, the flag will be honored there as specified.
>>>
>>
>> Ultimately we want to use some iOS 7 features so it needs to be fixed in iOS 7, I'm wondering how much of a change it will be and if it's worth rewriting it so will work on 5 6 and 7.
>
>
> As noted, UIKit doesn’t look at the wantsFullScreenLayout property with applications linked on the iOS 7 SDK, instead using edgesForExtendedLayout. The default value of that property is the equivalent of wantsFullScreenLayout=YES, and you should be able to set edgesForExtendedLayout to RectEdgesNone to get a similar effect to NO.

Yes, fixed it now, it's annoying that it is defaulted YES or that XCode 5/IB sets to YES. I had to go through 35+ VCs setting the RectEdgesNone flags to NO.

IMO, the "good" thing to do would if loading a Storyboard/NIB generated by an older version of XCode, would be to default those items to NO. For new VCs being created, set it to YES.

Thanks for the help.
Dave


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References: 
 >iOS 7 - Overriding NSNavigationController (From: Dave <email@hidden>)
 >Re: iOS 7 - Overriding NSNavigationController (From: David Duncan <email@hidden>)
 >Re: iOS 7 - Overriding NSNavigationController (From: Dave <email@hidden>)
 >Re: iOS 7 - Overriding NSNavigationController (From: David Duncan <email@hidden>)

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