ios - Can I install Auto Layout constraints in views that are owned by VCs outside of my control? -


I am new to auto-layout. I want to convert an existing project into auto layout. The project does not use the interface builder, the entire view hierarchy is programmatically set.

After reading and experimenting with Apple, I am still not clear whether I am allowed to install obstacles in thoughts or not No Do my own custom views Is one of the controllers? The question is particularly interesting in the case of predefined visual controller sections of the UIIC, but in reality can be extended for any third party's visual controller which is outside of my control.

To illustrate my uncertainty, this example of the visual hierarchy: 

  + - UIWindow ----------------- ------------ ------ + | + - UINavigationController (?) ------------- + | | | + - MyViewController (UIView) ---------- + | | | | | + - ViewOn ------------------------ + | | | | | | | | | | | | | | + ----------------------------------- + | | | | | | + - View-to ------------------------ + | | | | | | | | | | | | | | + ----------------------------------- + | | | | | + --------------------------------------- + | | | + ------------------------------------------- + | + ----------------------------------------------- + < / code>  
 I am clearly responsible for the layout of SubViews  ViewOne  and  ViewTwo . Since I want to use auto layout, I enable it by setting SubViews (by setting  translatesAutoresizingMaskIntoConstraints  property to  NO  of the subview), then I Installing> View of MyViewController   
 Let's move upwards in the visual hierarchy again, since I want to use auto layout, I enable it on the subview, which is currently the view of  MyViewController  (by setting  translatesAutoresizingMaskIntoConstraints  property to  setting) ). But what should I do about the obstacles?  
     
  1.  Install the desired obstacles in the view of the  UINavigationController ? It feels strongly like I am violating the encapsulation of the  UINavigationController . Since I do not have any information about the internal view hierarchy of  UINavigationController , what is the method of setting a restriction that is not messing up  UINavigationController  view layout? And what scene should I install, because I do not know the internal scene hierarchy?  
  2.   Install any obstacles in the view of UIVAC controller ? At first glance, it seems to be the right thing to do, because now I am not violating the encapsulation - I leave it to  UINavigationController  how it wants to get my idea and what obstacles Wants to set it up yourself However, my experiments clearly indicate that the correct solution is not because  UINavigationController  never establishes any obstacles in itself - resulting in the result of  MyViewController  Can get zero size frame   
     Can anyone knowledgeable about auto layout provide some perceptual guidance to anyone here? What is one of the two solutions right above, which one, and why? Or am I somehow fundamentally confused?   
     
     
     Your first instinct was correct;  MyViewController  view  UINavigationController < / code> is a container view controller, it takes a view controller and determines how to put a view of the baby controller. If you are using springs and struts or auto layout, then you should not care.  
     If it wants to use the automatic layout, then  this  will be set  translatesAutoResizingMaskIntoConstraints  to  not .  MyViewController  that part should not be done. Open the source of an auto-layout enabled storyboard that should be set to the top-level view (people who directly view the view controller back) that property should be set to  NO , and you will see the top-level view < code> YES  (while others do all other views).  
     This means that if you want to create a custom container controller, then the container will have to set the property to  NO  and install any constraints. The custom container manages its view (which includes  MyViewController  in this case), and is responsible for laying down its subviews.

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