UICollectionView + UIKit Dynamic

一、Demo1

@implementation ASHCollectionViewController

static NSString * CellIdentifier = @"CellIdentifier";

-(void)viewDidLoad 
{
    [super viewDidLoad];
    [self.collectionView registerClass:[UICollectionViewCell class] 
            forCellWithReuseIdentifier:CellIdentifier];
}

-(UIStatusBarStyle)preferredStatusBarStyle 
{
    return UIStatusBarStyleLightContent;
}

-(void)viewDidAppear:(BOOL)animated 
{
    [super viewDidAppear:animated];
    [self.collectionViewLayout invalidateLayout];
}

#pragma mark - UICollectionView Methods

-(NSInteger)collectionView:(UICollectionView *)collectionView 
    numberOfItemsInSection:(NSInteger)section 
{
    return 120;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView 
                 cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{
    UICollectionViewCell *cell = [collectionView 
        dequeueReusableCellWithReuseIdentifier:CellIdentifier 
                                  forIndexPath:indexPath];

    cell.backgroundColor = [UIColor orangeColor];
    return cell;
}

@end