UICollectionView Vertical显示最后一半的单元格

Question

i have collectionView. it shows cell in vertically.

in the start the collectionView looks like this

start of the collectionview

at the end it looks like this

end of collectionView

so it basically doesnt show up the whole cell in the end the code for collection class is

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

 }

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


#pragma mark - CollectionView Datasource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 9;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    ViewControllerCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];



    return cell;
}
@end

Answer 1

您必须在情节提要中指定单元格大小。

Answer 2

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

float width = 100;  //change to your needed width
float height = 100;  //change to your needed height

return CGSizeMake(width, height);

}

Answer 3

try this code it will help you

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 9;
}


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"cellIdentifier";
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    return cell;
}

and change identifier name in attribute inspector as shown in image: