How to use Uicollectionview

1. Compliance with agreements

<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>

2. Create

Uicollectionviewflowlayout * layout = [[Uicollectionviewflowlayout alloc]init];
layout.minimuminteritemspacing = 10; The spacing between minimum item
layout.minimumlinespacing = 10;//Minimum line spacing
CollectionView = [[Uicollectionview alloc]initwithframe:cgrectmake (0, 0, WIDTH, height-64-49) Collectionviewlayout: Layout];
Collectionview.delegate = self;
Collectionview.datasource = self;

Important

1>, if it is a code-defined cell, it should be registered with the following method

[CollectionView Registerclass:[piccollectionviewcell class] forcellwithreuseidentifier:@ "CC"];

2>, if the cell defined by Xib is to be used

[CollectionView registernib:[uinib nibwithnibname:@ "Piccollectionviewcell" Bundle:[nsbundle MainBundle]] forcellwithreuseidentifier:@ "CC"];

3, return the number of item

-(Nsinteger) CollectionView: (Uicollectionview *) CollectionView numberofitemsinsection: (NSInteger) Section
{
return datasourse.count;
}

4. Cell multiplexing

Xib and code both use the following methods

Piccollectionviewcell * cell = [CollectionView dequeuereusablecellwithreuseidentifier:@ "CC" ForIndexPath:indexPath];

5. Important Protocol Method

1> returns the size of item, the system automatically sets the number of items displayed per row according to the size of item (Layout.size method can be used)

-(Cgsize) CollectionView: (Uicollectionview *) CollectionView layout: (uicollectionviewlayout *) collectionviewlayout Sizeforitematindexpath: (Nsindexpath *) Indexpath
{
Cgsize size = Cgsizemake (90, 80);
return size;
}

2>//Returns whether this Uicollectionview can be selected

-(BOOL) CollectionView: (Uicollectionview *) CollectionView Shouldselectitematindexpath: (Nsindexpath *) IndexPath

{ return YES;

}

How to use Uicollectionview