DEMO-CHT # 166BUG

Reproduce the BUG described in #174.

The demo will have a part of the header does not display properly.

The main steps

In the UICollectionViewWaterfallLayout.m -> - (void) prepareLayout, set NSIndexPath indexPathForItem: 0 inSection: section]`

In the UICollectionViewWaterfallLayout.m -> - (NSArray *) layoutAttributesForElementsInRect: (CGRect) rect, using the NSDictionary as the storage structure, use attr`` NSIndexPath as the NSDictionary key

So, when UICollectionViewWaterfallLayout.m -> - (NSArray *) layoutAttributesForElementsInRect: (CGRect) rect need to return both header and footer 'will appear. That is, value1 in dict will be replaced by value2.

NSMutableDictionary * dict = [NSMutableDictionary dictionary];
Dict [@ "KEY"] = @ "value1";
Dict [@ "KEY"] = @ "value2";

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DEMO-CHT#166BUG

重现#174中所描述的BUG。

这个demo将有一部分header无法正常显示.

主要步骤

在 UICollectionViewWaterfallLayout.m -> - (void)prepareLayout 中，设置header、footer使用的NSIndexPath定义均为[NSIndexPath indexPathForItem:0 inSection:section]

在 UICollectionViewWaterfallLayout.m -> - (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect中，采用了NSDictionary作为存储结构，使用attr的NSIndexPath作为NSDictionary的key

所以，当UICollectionViewWaterfallLayout.m -> - (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect需要同时返回header和footer将会出现header被footer替换的现象。即：dict中的value1将被value2所替换。

NSMutableDictionary *dict = [NSMutableDictionary dictionary];
dict[@"KEY"] = @"value1";
dict[@"KEY"] = @"value2";