Wrapping cells in UICollectionview iOS 8 - ios

Question

I have the same problem with this question. I already tried the solution but it is not called. Where should I implement or call the method or subclass of UICollectionViewFlowLayout.
Where should I use this?
Thanks in advance.

Answer 1

U can do like below, this method is called automatically,
swift version
first create a new class which is the subclass of UICollectionViewFlowLayout for example
import UIKit
class CustomLayout: UICollectionViewFlowLayout
{
override init() {
super.init()
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
var newAttributes:[AnyObject] = []
override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
super.layoutAttributesForElementsInRect(rect)
var attributes:[AnyObject] = super.layoutAttributesForElementsInRect(rect)!
//arrayWithCapacity(attributes.count)
//configure your attributes for each item hear and store it in separate array and return that array in below example i am sending the same attributes.
return attributes
}
}
in ViewController class
import UIKit
class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource {
#IBOutlet weak var aCollectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var customLayout:CustomLayout = CustomLayout() //initilise the custom layout for collection view
customLayout.minimumLineSpacing = 0.33 //set the offset between items
customLayout.minimumInteritemSpacing = 0.0
customLayout.itemSize = CGSizeMake(50.0, 50.0)
aCollectionView.collectionViewLayout = customLayout //set it to collection view
var cellNib:UINib = UINib(nibName: "CollectionViewCell", bundle: nil)
aCollectionView.registerNib(cellNib, forCellWithReuseIdentifier: "CELL")
}
objective-c version
in xcode crate a new file by subclassing the UICollectionViewFlowLayout lets say it's name as MyCustomCollectionViewFlowLayout and in MyCustomCollectionViewFlowLayout .m file place the code
#import "MyCustomCollectionViewFlowLayout.h"
#implementation MyCustomCollectionViewFlowLayout
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
[super layoutAttributesForElementsInRect:rect];
NSArray *attributes = [super layoutAttributesForElementsInRect:rect];
NSMutableArray *newAttributes = [NSMutableArray arrayWithCapacity:attributes.count];
for (UICollectionViewLayoutAttributes *attribute in attributes)
{
if ((attribute.frame.origin.x + attribute.frame.size.width <= ceil(self.collectionViewContentSize.width)) &&
(attribute.frame.origin.y + attribute.frame.size.height <= ceil(self.collectionViewContentSize.height)))
{
[newAttributes addObject:attribute];
}
}
return newAttributes;
}
- (void)dealloc
{
[super dealloc];
}
#end
and the class where u are using the collection view just import MyCustomCollectionViewFlowLayout.h this and set it to collection view
- (void)viewDidLoad
{
[super viewDidLoad];
//....other codes
MyCustomCollectionViewFlowLayout *flowLayout = [[MyCustomCollectionViewFlowLayout alloc]init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
//set according to your settings
flowLayout.minimumInteritemSpacing = 0.0f;
flowLayout.minimumLineSpacing = 0.33f; //set the offset between items
_collectionView.pagingEnabled = YES;
_collectionView.bounces = NO;
_collectionView.showsHorizontalScrollIndicator = NO;
_collectionView.showsVerticalScrollIndicator = NO;
[_collectionView setCollectionViewLayout:flowLayout]; //set your custom flow layout hear
[_collectionView registerClass:[MyCollectionViewCell class] forCellWithReuseIdentifier:cellIdentifier]; //set the custom cell
}