IOS UICollectionView handwritten code implementation steps

IOS UICollectionView handwritten code implementation steps
IOS UICollectionView handwritten code implementation steps

//

// ViewController. h

// CollectionView handwritten code

//

// Created by yangxiuying on 14/11/28.

// Copyright (c) 2014 lanjiying. All rights reserved.

//

# Import

@ Interface ViewController: UIViewController

{

NSString * identifier;

}

//

// ViewController. m

// CollectionView handwritten code

//

// Created by yangxiuying on 14/11/28.

// Copyright (c) 2014 lanjiying. All rights reserved.

//

# Import "ViewController. h"

@ Interface ViewController ()

@ End

@ Implementation ViewController

-(Void) viewDidLoad {

[Super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

Identifier = @ "cell ";

// Initialize layout

UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc] init];

[FlowLayout setScrollDirection: UICollectionViewScrollDirectionVertical];

// UIEdgeInsets top = {15, 10, 15, 5 };

// [FlowLayout setSectionInset: top];

UICollectionView * collectionView = [[UICollectionView alloc] initWithFrame: CGRectMake (0, 30,320,480) collectionViewLayout: flowLayout];

// Register a cell

[CollectionView registerClass: [UICollectionViewCell class] forCellWithReuseIdentifier: identifier];

// Set proxy

CollectionView. delegate = self;

CollectionView. dataSource = self;

[Self. view addSubview: collectionView];

}

# Pragma mark-collectionView delegate

// Set partitions

-(NSInteger) numberOfSectionsInCollectionView :( UICollectionView *) collectionView

{

Return 1;

}

// Set the element size box

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

{

UIEdgeInsets top = {30, 15, 30, 15 };

Return top;

}

// Number of elements on each partition

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

{

Return 24;

}

// Set the Element Content

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

{

UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier: identifier forIndexPath: indexPath];

[Cell sizeToFit];

Cell. backgroundColor = [UIColor greenColor];

Return cell;

}

// Set the cell width

// Set the element size

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

Return CGSizeMake (140,160 );

}