iphone - 无 block 地遍历 NSMutableIndexSet

Question

目前我正在执行以下操作以迭代 NSMutableIndexSet:

 if ([indexSet isNotNull] && [indexSet count] > 0){
        __weak  PNRHighlightViewController *weakSelf = self;
        [indexSet enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
            if ([[self.highlightedItems_ objectAtIndex:idx] isNotNull]){
                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection: [weakSelf.collectionView numberOfSections]-1];
                [weakSelf.collectionView reloadItemsAtIndexPaths:[NSArray arrayWithObject:indexPath]];
            }
        }];
    }

我想生成一个 NSIndexPath 数组，然后在这些索引路径上重新加载整个 collectionView。所以基本上我想在 block 完成后调用重新加载。我该怎么做？

Answer 1

一种方法是，

[indexSet enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
            if ([[self.highlightedItems_ objectAtIndex:idx] isNotNull]){
                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection: [weakSelf.collectionView numberOfSections]-1];
                //store the indexPaths in an array or so
            }
            if (([indexSet count] - 1) == idx) { //or ([self.highlightedItems_ count] - 1)
               //reload the collection view using the above array
            }
        }];
    }