怎样在UICollectionView中添加Header和footer
最新回答
许多
2024-09-26 09:18:54
{
[super viewDidLoad];
//Initialize recipe image array
NSArray *mainDishImages = [NSArray arrryWithObjects:@"egg_benedict.jpg", @"full_breakfast.jpg", @"ham_and_cheese_panini.jpg", @"ham_and_egg_sandwich.jpg", @"hamburger.jpg", @"instant_noodle_with_egg.jpg", @"japanese_noodle_with_pork.jpg", @"mushroom_risotto.jpg", @"noodle_with_bbq_pork.jpg", @"thai_shrimp_cake.jpg", @"vegetable_curry.jpg", nil];
NSArray *drinkDessertImages = [NSArray arrayWithObjects:@"angry_birds_cake.jpg", @"creme_brelee.jpg", @"green_tea.jpg", @"starbucks_coffee.jpg", @"white_chocolate_donut.jpg", nil];
recipeImages = [NSArray arrayWithObjects:mainDishImages,drinkDesserImages,nil];
}
上面的代码将recipes images分成两组。接下来，修改"numberOfIntemsInSecion:"方法来返回，每个secions中的items数目：
- (NSInteger)collectionView:(UICollectionView*)collectionView numberOfItemsInSecion:(NSInteger)section
{
return [[recipeImages objectAtIndex:sectin]count];
}
接下来我们按照下面的方法修改"cellForItemAtIndexPath:"方法
- (UICollectionVIewCell
*)collectionView:(UICollectionView*)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *identifier = @"Cell";
RecipeViewCell *cell = (RecipeViewCell
*)[collectionView dequeueReuseIdentifier:identifier
forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imagedNamed:[recipeImages[indexPath.section] objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame-2.png"]];
return cell;
}
你可以和以前的代码比较以下，你就会知道只有一样是唯一的变化。我们首先检索该数组的section number然后从section中获取具体的items。
最后，怎样给collection
view实现两个section,这个可以通过方法调用下面的方法来完成即：在RecipeCollectionViewController.m中的
numberOfSectionsInCollectionView方法，在collectin View中返回section中的数量。
- (NSInteger)numberOfSectionsInCollectionVIew:(UICollectionView *)collectionView
{
return [recipeImages count];
}
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