ios - UICollectionViewCell Not drawing cell on indexpath.row == 0 -


see image attached.uicollectionviewcell missing

i'm using basic uiflowlayout subclass accompany view, no matter i've tried, decides doesn't need draw cell 0,

however if scroll down , up, draw properly.

it seems it's ios sdk bug, need investigate further. wondering if knows ideas try this.

this answer solve it:

uicollectionview flowlayout not wrapping cells correctly (ios)1

but case unique using uidynamicanimator calculate layout attributes.

so code went this:

-(nsarray *)layoutattributesforelementsinrect:(cgrect)rect {     return [self.dynamicanimator itemsinrect:rect]; }  -(uicollectionviewlayoutattributes *)layoutattributesforitematindexpath:(nsindexpath *)indexpath {     return [self.dynamicanimator layoutattributesforcellatindexpath:indexpath]; }  - (uicollectionviewlayoutattributes *)layoutattributesforsupplementaryviewofkind:(nsstring *)kind atindexpath:(nsindexpath *)indexpath {     return [self.dynamicanimator layoutattributesforsupplementaryviewofkind: kind atindexpath:indexpath]; }

to this:

-(nsarray *)layoutattributesforelementsinrect:(cgrect)rect {     nsarray *attributes = [super layoutattributesforelementsinrect:rect];     nsmutablearray *newattributes = [nsmutablearray arraywithcapacity:attributes.count];     (uicollectionviewlayoutattributes *attribute in attributes) {         if ((attribute.frame.origin.x + attribute.frame.size.width <= self.collectionviewcontentsize.width) &&             (attribute.frame.origin.y + attribute.frame.size.height <= self.collectionviewcontentsize.height)) {             [newattributes addobject:attribute];         }     }     return newattributes; }  -(uicollectionviewlayoutattributes *)layoutattributesforitematindexpath:(nsindexpath *)indexpath {     return [self.dynamicanimator layoutattributesforcellatindexpath:indexpath]; }  - (uicollectionviewlayoutattributes *)layoutattributesforsupplementaryviewofkind:(nsstring *)kind atindexpath:(nsindexpath *)indexpath {     return [self.dynamicanimator layoutattributesforsupplementaryviewofkind: kind atindexpath:indexpath]; }

and problem solved! it's plausable logic in code -(bool)shouldinvalidatelayoutforboundschange doing wrong, had checked , logic looked fine.


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