ios - UICollectionViewCell subclass init never run -


i have added collection view in viewdidload this...

self.collectionview = [[uicollectionview alloc] initwithframe:cgrectmake(0, 0, 10, 10) collectionviewlayout:flowlayout]; self.collectionview.delegate = self; self.collectionview.datasource = self; self.collectionview.backgroundcolor = [uicolor whitecolor]; [self.collectionview registerclass:[cameracell class] forcellwithreuseidentifier:cameracellreuseidentifier]; [self.collectionview settranslatesautoresizingmaskintoconstraints:no]; [self.view addsubview:self.collectionview];

and have uicollectionviewcell subclass called cameracell init this...

- (id)init {     self = [super init];     if (self) {         // add customisation here...         [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(imagechanged:) name:@"image" object:nil];          self.contentview.backgroundcolor = [uicolor yellowcolor];          self.imageview = [[uiimageview alloc] initwithframe:cgrectzero];         self.imageview.contentmode = uiviewcontentmodescaleaspectfill;         self.imageview.clipstobounds = yes;         [self.imageview settranslatesautoresizingmaskintoconstraints:no];         [self.contentview addsubview:self.imageview];          nsdictionary *views = nsdictionaryofvariablebindings(_imageview);          [self.contentview addconstraints:[nslayoutconstraint constraintswithvisualformat:@"v:|[_imageview]|"                                                                                  options:0                                                                                  metrics:nil                                                                                    views:views]];          [self.contentview addconstraints:[nslayoutconstraint constraintswithvisualformat:@"|[_imageview]|"                                                                                  options:0                                                                                  metrics:nil                                                                                    views:views]];     }     return self; }

but when run app collection view there , can scroll can't see cells. have added breakpoint in cell's init , never gets called. there method have override?

edit

when log cell in cellforitematindexpath...

- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {     cameracell *cell = [collectionview dequeuereusablecellwithreuseidentifier:cameracellreuseidentifier forindexpath:indexpath];      nslog(@"%@", cell);      return cell; }

it displays correct class...

<cameracell: 0x1f07ba30; baseclass = uicollectionviewcell; frame = (0 20; 320 280); layer = <calayer: 0x1f07bb40>>

the method need implement - (instancetype)initwithframe:(cgrect)rect


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