ios - UICollectionViewFlowLayout subclass not working -


here uicollectionviewflowlayout subclass:

@implementation mycollectionviewflowlayout  - (id)init {     self = [super init];     if (self) {         [self setup];     }      return self; }  - (void)setup {     self.itemsize = cgsizemake(320, 320);     self.sectioninset = uiedgeinsetsmake(0, 0, 0, 0);     self.minimuminteritemspacing = 0;     self.minimumlinespacing = 0;     self.scrolldirection = uicollectionviewscrolldirectionvertical; }   - (void)preparelayout {     [super preparelayout];  }  - (cgsize)collectionviewcontentsize {     return self.itemsize; }  - (nsarray *)layoutattributesforelementsinrect:(cgrect)rect {     nsarray* allattributesinrect = [super layoutattributesforelementsinrect:rect];      return allattributesinrect; }   - (uicollectionviewlayoutattributes*)layoutattributesforitematindexpath:(nsindexpath *)indexpath {     uicollectionviewlayoutattributes* attributes = [super layoutattributesforitematindexpath:indexpath];      return attributes; }  @end

when following, collection view not scroll:

mycollectionviewflowlayout* flowlayout = [[mycollectionviewflowlayout alloc] init];

however if this:

uicollectionviewflowlayout* flowlayout = [[uicollectionviewflowlayout alloc] init]; flowlayout.itemsize = cgsizemake(320, 320); flowlayout.sectioninset = uiedgeinsetsmake(0, 0, 0, 0); flowlayout.minimuminteritemspacing = 0; flowlayout.minimumlinespacing = 0; flowlayout.scrolldirection = uicollectionviewscrolldirectionvertical;

then collection view scrolls fine. doing wrong in uicollectionviewflowlayout subclass?

the problem collectionviewcontentsize

- (cgsize)collectionviewcontentsize {     return self.itemsize; }

returning itemsize here means entire contentsize collection view size of 1 item. try removing code, or changing to

- (cgsize)collectionviewcontentsize {     [super collectionviewcontentsize]; }

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