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Editor to share with you how to use UICollectionView in ios, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

-(void) viewDidLoad {

[super viewDidLoad]

Self.title = @ "basic use of UICollectionView"

Self.view.backgroundColor = [UIColor whiteColor]

UICollectionViewFlowLayout * layout = [[UICollectionViewFlowLayout alloc] init]

UICollectionView * collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout]

CollectionView.delegate = self

CollectionView.dataSource = self

[collectionView registerClass: [UICollectionViewCell class] forCellWithReuseIdentifier:@ "cellID"]

[self.view addSubview:collectionView]

/ / Do any additional setup after loading the view.

}

# Total number of pragma mark UICollectionView-delegate and dataSource-UICollectionViewCell

-(NSInteger) collectionView: (UICollectionView *) collectionView numberOfItemsInSection: (NSInteger) section {

Return 100

}

# pragma mark UICollectionView-delegate and dataSource every UICollectionViewCell

-(UICollectionViewCell *) collectionView: (UICollectionView *) collectionView cellForItemAtIndexPath: (NSIndexPath *) indexPath {

Static NSString * cellID = @ "cellID"

UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath]

If (cell = = nil) {

Cell = [[UICollectionViewCell alloc] init]

}

Cell.backgroundColor = [UIColor grayColor]

Return cell

}

# pragma mark-- UICollectionViewDelegate sets the size of each UICollectionView

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

{

Return CGSizeMake (CGRectGetWidth (self.view.bounds) / 3-10, CGRectGetWidth (self.view.bounds) / 3-10)

}

# number of pragma mark-CollectionView section

-(NSInteger) numberOfSectionsInCollectionView: (UICollectionView *) collectionView

{

Return 1

}

# pragma mark- sets the spacing of each UICollectionView

-(UIEdgeInsets) collectionView: (UICollectionView *) collectionView layout: (UICollectionViewLayout *) collectionViewLayout insetForSectionAtIndex: (NSInteger) section {

Return UIEdgeInsetsMake (0Jol 0,0Jol 0)

}

# pragma mark- sets the vertical spacing of each UICollectionView

-(CGFloat) collectionView: (UICollectionView *) collectionView layout: (UICollectionViewLayout *) collectionViewLayout minimumInteritemSpacingForSectionAtIndex: (NSInteger) section {

Return 10

}

# pragma mark- sets the horizontal spacing of each UICollectionView

-(CGFloat) collectionView: (UICollectionView *) collectionView layout: (UICollectionViewLayout*) collectionViewLayout minimumLineSpacingForSectionAtIndex: (NSInteger) section {

Return 10

}

# Click events of pragma mark-UICollectionView

-(void) collectionView: (UICollectionView *) collectionView didSelectItemAtIndexPath: (NSIndexPath *) indexPath {

NSLog (@ "% @", @ (indexPath.row) .description)

}

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