ios - Creating a UICollectionView within a subview -

i have view controller (that sits in tab bar controller), need add collection view controller. see lots of tutorials on google seem point creating uicollectionviewcontroller , starting in viewdidload. how do in subview?

i have view controller.m file so:

- (void) createview // called viewdidload {      uiscrollview *scrollview = [[uiscrollview alloc] initwithframe:cgrectmake(0.0, 64.0, screenwidth, screenheight)];      [scrollview.layer addgradient];      acollectionview *theview = [[acollectionview alloc] init];      [self.view addsubview:theview]; } 

next started uicollectionview subclass called acollectionview.h

@interface acollectionview : uicollectionview  @end 

and .m file this:

#import "acollectionview.h"  @implementation bestcollectionview  - (id)initwithframe:(cgrect)frame {     self = [super initwithframe:frame];     if (self) {         // initialization code     }     return self; } 

where start collection view, in initwithframe?

i trying follow this: creating uicollectionview programmatically

is paradigm correct?

@property (nonatomic, strong) uicollectionview *collectionview;  - (void)viewdidload {     [super viewdidload];      uicollectionviewflowlayout *layout = [[uicollectionviewflowlayout alloc] init];     self.collectionview = [[uicollectionview alloc] initwithframe:self.yoursubview.frame collectionviewlayout:layout];     [self.collectionview setdatasource:self];     [self.collectionview setdelegate:self];      [self.collectionview registerclass:[uicollectionviewcell class] forcellwithreuseidentifier:@"cellidentifier"];      [self.yoursubview addsubview:self.collectionview];  }  - (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section {     return 50; }  - (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {     uicollectionviewcell *cell=[collectionview dequeuereusablecellwithreuseidentifier:@"cellidentifier" forindexpath:indexpath];     cell.backgroundcolor = [uicolor redcolor];     return cell; }  - (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout*)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath {     return cgsizemake(100, 100); }