ios – UICollectionView布局不一致,UICollectionViewFlowLayout

概述我无法以一致的方式在UICollectionView中显示单元格.单元的初始显示是正确的,但是每次用户滚动过去然后返回到一组单元格时,显示都是不正确的.行应该只包含2个或1个单元格. 2个单元格,每个显示宽度的一半,1个单元格占全宽. - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionVi 我无法以一致的方式在UICollectionVIEw中显示单元格.单元的初始显示是正确的,但是每次用户滚动过去然后返回到一组单元格时,显示都是不正确的.行应该只包含2个或1个单元格. 2个单元格,每个显示宽度的一半,1个单元格占全宽.

- (CGSize)collectionVIEw:(UICollectionVIEw *)collectionVIEw layout:(UICollectionVIEwLayout *)collectionVIEwLayout sizeforItemAtIndexPath:(NSIndexPath *)indexPath{    return [self preferredSizeforIndexPath:indexPath];}- (CGSize)preferredSizeforIndexPath:(NSIndexPath *)indexPath {    BOol isLastObjectInSection = NO;    Nsstring *sectionKey = [[arrCollectionData[indexPath.section] allKeys] objectAtIndex:0];    DLog(@"SectionKey: %@",sectionKey);    NSArray *arrSection = [arrCollectionData[indexPath.section] objectForKey:sectionKey];    DLog(@"ArrSection: %@",arrSection);    if ( arrSection[indexPath.row] == arrSection.lastObject ) {        if( arrSection.count % 2 != 0 ) {            isLastObjectInSection = YES;        }    }    CGSize cellSize = CGSizeZero;    if (UIDeviceOrIEntationIsLandscape([[UIDevice currentDevice] orIEntation])) {        if (isLastObjectInSection == YES) {            cellSize = CGSizeMake(IPAD_BADGE_WIDTH_LANDSCAPE_WIDE,IPAD_BADGE_HEIGHT_LANDSCAPE_WIDE);        } else {            cellSize = CGSizeMake(IPAD_BADGE_WIDTH_LANDSCAPE,IPAD_BADGE_HEIGHT_LANDSCAPE);        }    } else {        if (isLastObjectInSection == YES) {            cellSize = CGSizeMake(IPAD_BADGE_WIDTH_WIDE,IPAD_BADGE_HEIGHT_WIDE);        } else {            cellSize = CGSizeMake(IPAD_BADGE_WIDTH,IPAD_BADGE_HEIGHT);        }    }    DLog(@"CellSize: %@",NsstringFromCGSize(cellSize));    return cellSize;}

以下是收集数据的示例.

Printing description of self->arrCollectionData:<__NSArrayI 0x94bbc40>({    "march 12,2013" =     (        "<FMLeafTimelineContainer: 0x94b2430>","<FMLeafTimelineContainer: 0x94b3670>"    );},{    "February 25,2013" =     (        "<FMLeafTimelineContainer: 0x94b4500>"    );},{    "February 14,2013" =     (        "<FMLeafTimelineContainer: 0x94b48f0>","<FMLeafTimelineContainer: 0x94b3a60>"    );},{    "February 12,2013" =     (        "<FMLeafTimelineContainer: 0x94b3ce0>","<FMLeafTimelineContainer: 0x94b2b00>"    );},{    "February 4,2013" =     (        "<FMCommunityTimelineContainer: 0x94b4e90>","<FMCommunityTimelineContainer: 0x94b5050>","<FMCommunityTimelineContainer: 0x94b5f70>"    );},{    "January 30,2013" =     (        "<FMCommunityTimelineContainer: 0x94b6ad0>","<FMCommunityTimelineContainer: 0x94b5a90>"    );},{    "January 24,2013" =     (        "<FMCommunityTimelineContainer: 0x94b5d00>","<FMCommunityTimelineContainer: 0x94b6d90>"    );},{    "January 22,2013" =     (        "<FMCommunityTimelineContainer: 0x94b6440>"    );},{    "January 21,2013" =     (        "<FMCommunityTimelineContainer: 0x94b6260>","<FMCommunityTimelineContainer: 0x94b62e0>","<FMCommunityTimelineContainer: 0x94b70c0>","<FMCommunityTimelineContainer: 0x94b55a0>","<FMCommunityTimelineContainer: 0x94b82d0>","<FMCommunityTimelineContainer: 0x94b78b0>"    );},{    "December 20,2012" =     (        "<FMCommunityTimelineContainer: 0x94b53f0>"    );},{    "December 6,2012" =     (        "<FMCommunityTimelineContainer: 0x94b7200>"    );},{    "December 4,2012" =     (        "<FMCommunityTimelineContainer: 0x94b72b0>"    );},{    "November 19,2012" =     (        "<FMCommunityTimelineContainer: 0x94b7ae0>"    );})

下面的图片都展示了集合视图的相同部分.

解决方法 问题是由父实例的子视图引起的,该子视图具有在实例化时分配的固定帧大小. Overrode setFrame：用于UICollectionVIEw子类以分配子视图帧的值,每次单元格出列并重新排队时调用setFrame：进行相应调整. 总结

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