ios - How to do Auto Layout XIB being added programmatically? -

i'm trying add subview programmatically people can horizontally scroll section. looks subview doesn't fit superview , content not showing

here's code viewcontroller.m

- (void)viewdidlayoutsubviews {     [super viewdidlayoutsubviews];      (int = 0; < 2; i++)     {         cgrect frame;         frame.origin.x = self.scrollview.frame.size.width * i;         frame.size = self.scrollview.frame.size;         self.scrollview.pagingenabled = yes;          newssection *sectionview = [[newssection alloc] initwithframe:frame];                      [self.scrollview addsubview:sectionview];     }      self.scrollview.contentsize =  cgsizemake(self.scrollview.frame.size.width * 2, self.scrollview.frame.size.height);   } 

this storyboard , constraints.

and newssection.xib

this code of newssection.m

-(id) initwithframe:(cgrect)frame {     self = [super initwithframe:frame];     if(self) {         [[nsbundle mainbundle] loadnibnamed:@"newssection" owner:self options:nil];          [self addsubview:self.view];     }     return self; } 

and result i'm seeing

update: product code here https://github.com/noppanit/uiscrollviewautolayout

i'll start off read regarding uiscrollview , autolayout: https://developer.apple.com/library/ios/technotes/tn2154/_index.html

now, here's sample code should keep going. need make newsview managed viewcontroller, e.g. newsviewcontroller, , initialize newsviewcontroller before using in setupnewsview:

- (void)viewdidload {     [super viewdidload];     [self setupnewsview]; }  - (void) setupnewsview {      uiview *newsview = [[newssection alloc] initwithframe:cgrectzero];      self.scrollview.translatesautoresizingmaskintoconstraints = no;     newsview.translatesautoresizingmaskintoconstraints = no;      [self.scrollview addsubview:newsview];      nsdictionary *viewsdict = @{ @"newsview": newsview };      [self.scrollview addconstraints:[nslayoutconstraint constraintswithvisualformat:@"h:|[newsview]|"                                                                             options:nslayoutformatalignalltop | nslayoutformatalignallbottom                                                                             metrics:nil                                                                               views:viewsdict]];     [self.scrollview addconstraints:[nslayoutconstraint constraintswithvisualformat:@"v:|[newsview]|"                                                                         options:0                                                                         metrics:nil                                                                           views:viewsdict]];      [self.scrollview addconstraint:[nslayoutconstraint constraintwithitem:newsview                                                                 attribute:nslayoutattributewidth                                                                 relatedby:nslayoutrelationequal                                                                    toitem:self.scrollview                                                                 attribute:nslayoutattributewidth                                                                multiplier:1.0f                                                                  constant:0.0f]];      [self.scrollview addconstraint:[nslayoutconstraint constraintwithitem:newsview                                                                 attribute:nslayoutattributeheight                                                                 relatedby:nslayoutrelationequal                                                                    toitem:self.scrollview                                                                 attribute:nslayoutattributeheight                                                                multiplier:1.0f                                                                  constant:0.0f]]; } 

edit:

i'm sorry. missed add line in solution before:

[self.scrollview addconstraints:[nslayoutconstraint constraintswithvisualformat:@"v:|[newsview]|"                                                                         options:0                                                                         metrics:nil                                                                           views:viewsdict]]; 

regarding code sample: first, fill viewcontroller code sample depicts. incorporated change first sample. remove code overrides viewdidlayoutsubviews.

then, need change initializer of newsview.

now looks this:

-(id) initwithframe:(cgrect)frame {     self = [super initwithframe:frame];     if(self) {         [[nsbundle mainbundle] loadnibnamed:@"newssection" owner:self options:nil];          [self addsubview:self.view];     }     return self; } 

one problem here load nib don't assign view nib view object. reference (https://developer.apple.com/library/prerelease/ios/documentation/uikit/reference/nsbundle_uikitadditions/index.html) depicts loadnibnamed:owner:options: returns top level objects. since have 1 top level object in our xib need assign ourself. hacky , introduces problem nib leak in future. better make uiviewcontroller xib here.

to make code work, initializer of newsview should this. won't connect outlet.

- (id)initwithframe:(cgrect)frame {     self = [super initwithframe:frame];     if (self) {         self = [[nsbundle mainbundle] loadnibnamed:@"newssection" owner:self options:nil][0];     }     return self; }