Criando um UICollectionView programaticamente

180

Estou procurando um guia ou tutorial que me mostre como configurar um UICollectionView simples usando apenas código.

Estou vasculhando a documentação no site da Apple e também estou usando o manual de referência .

Mas eu realmente me beneficiaria de um guia simples que pode me mostrar como configurar um UICollectionView sem precisar usar arquivos Storyboards ou XIB / NIB - mas, infelizmente, quando eu procuro, tudo o que posso encontrar são tutoriais que apresentam o Storyboard.

Jimmery
fonte
Na documentação, há um único inicializador que você deve usar em vez de qualquer inicializador de superclasse. Onde você tem problemas exatamente?
A-Live
3
Realmente? Cheguei até a seção "Configurando células e visualizações complementares" - fui burro e perdi essa linha? Ou ainda tenho que alcançá-lo?
21413 Jimmery
A primeira tarefa é Initializing a Collection View, você está usando o inicializador a partir daí?
A-Live
3
Sim, mas isso por si só não é suficiente. Também precisarei configurar uma fonte de dados ou o aplicativo trava.
Jimmery
@ Jimmery Agora, como adicionar imagem na célula nesta coleção?
ArgaPK

Respostas:

364

Arquivo de cabeçalho:--

@interface ViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
{
    UICollectionView *_collectionView;
}

Arquivo de implementação: -

- (void)viewDidLoad
{
     [super viewDidLoad];
     self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

     UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
    _collectionView=[[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];
    [_collectionView setDataSource:self];
    [_collectionView setDelegate:self];

    [_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellIdentifier"];
    [_collectionView setBackgroundColor:[UIColor redColor]];

    [self.view addSubview:_collectionView];


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

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 15;
}

// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];

    cell.backgroundColor=[UIColor greenColor];
    return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(50, 50);
}

Resultado---

insira a descrição da imagem aqui

Warewolf
fonte
2
Você deve adicionar a visão de coleção como propriedade em iOS7@property (strong, nonatomic) UICollectionView *collectionView;
zontragon
1
A configuração deve ocorrer em - (vazio) loadView, não em viewDidLoad. Quanto ao motivo pelo qual ele funciona, o controlador primeiro carrega as visualizações padrão em sua super. É melhor sobrecarregar o loadview e atribuir suas visualizações personalizadas diretamente.
Pétur Ingi Egilsson
4
Além disso, se você estiver adicionando programaticamente quaisquer subvisões ao UICollectionViewCell, você realmente não deseja se registrar UICollectionViewCell, mas deseja subclassá-lo, faça sua configuração da célula no initWithFramemétodo e registre essa subclasse com o identificador de célula não UICollectionViewCell.
Rob
Alguém mais teve um erro com o código acima? Isso está me dando erro EXC_BAD_ACCESS na linha_collectionView=[[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];
shrishaster
'self.view = [[UIView aloc] initWithFrame: [[UIScreen mainScreen] limites]];' isso estava faltando.
shrishaster
55

Para o usuário swift4: -

class TwoViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UICollectionViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.collectionView = UICollectionView(frame: self.view.bounds, collectionViewLayout: flowLayout)
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "collectionCell")
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.backgroundColor = UIColor.cyan
        self.view.addSubview(collectionView)
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
       var cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionCell", for: indexPath as IndexPath)

       cell.backgroundColor = UIColor.green
       return cell
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        return CGSize(width: 50, height: 50)
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    }
}
Warewolf
fonte
1
Agora, como adicionar imagem nesta coleção por meio de programação?
ArgaPK
@ArgaPK acrescentando subexibição para celular no método cellForItem
Warewolf
17

Para Swift 2.0

Em vez de implementar os métodos necessários para desenhar CollectionViewCells:

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
    {
        return CGSizeMake(50, 50);
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets
    {
        return UIEdgeInsetsMake(5, 5, 5, 5); //top,left,bottom,right
    }

Usar UICollectionViewFlowLayout

func createCollectionView() {
    let flowLayout = UICollectionViewFlowLayout()

    // Now setup the flowLayout required for drawing the cells
    let space = 5.0 as CGFloat

    // Set view cell size
    flowLayout.itemSize = CGSizeMake(50, 50)

    // Set left and right margins
    flowLayout.minimumInteritemSpacing = space

    // Set top and bottom margins
    flowLayout.minimumLineSpacing = space

    // Finally create the CollectionView
    let collectionView = UICollectionView(frame: CGRectMake(10, 10, 300, 400), collectionViewLayout: flowLayout)

    // Then setup delegates, background color etc.
    collectionView?.dataSource = self
    collectionView?.delegate = self
    collectionView?.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "cellID")
    collectionView?.backgroundColor = UIColor.whiteColor()
    self.view.addSubview(collectionView!)
}

Implemente os UICollectionViewDataSourcemétodos conforme necessário:

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20;
    }
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    var cell:UICollectionViewCell=collectionView.dequeueReusableCellWithReuseIdentifier("collectionCell", forIndexPath: indexPath) as UICollectionViewCell;
    cell.backgroundColor = UIColor.greenColor();
    return cell;
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}
Amarela
fonte
9

Swift 3

class TwoViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UICollectionViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        let flowLayout = UICollectionViewFlowLayout()

        let collectionView = UICollectionView(frame: self.view.bounds, collectionViewLayout: flowLayout)
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "collectionCell")
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.backgroundColor = UIColor.cyan

        self.view.addSubview(collectionView)
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    {
        return 20
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionCell", for: indexPath as IndexPath)

        cell.backgroundColor = UIColor.green
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
    {
        return CGSize(width: 50, height: 50)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets
    {
        return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    }

}
Alex Shvets
fonte
@ArgaPK certeza, basta adicionar flowLayout.scrollDirection = .horizontal depois que você instanciar o FlowLayout :)
Alex Shvets
6
  1. Com base na resposta de @ Warewolf, o próximo passo é criar sua própria célula personalizada.

    Vá para File -> New -> File -> User Interface -> Empty -> Callesta ponta "customNib".

  2. Ao customNibarrastar uma UICollectionViewcélula, dê-lhe a reutilização do identificador de célula @"Cell".

  3. File -> New -> File -> Cocoa Touch Class -> Class"CustomCollectionViewCell"subclasse nomeada se UICollectionViewCell.

  4. Volte para a ponta customizada, clique na célula e faça essa classe customizada "CustomCollectionViewCell".

  5. Vá para o seu viewDidLoad viewcontrollere, em vez de

    [_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellIdentifier"];

    ter

    UINib *nib = [UINib nibWithNibName:@"customNib" bundle:nil]; [_collectionView registerNib:nib forCellWithReuseIdentifier:@"Cell"];

  6. Além disso, altere (para o seu novo identificador de célula)

    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

Ryan Zhou
fonte
6

Você pode manipular células personalizadas na visualização uicollection, veja o código abaixo.insira a descrição da imagem aqui

- (void)viewDidLoad
{
  UINib *nib2 = [UINib nibWithNibName:@"YourCustomCell" bundle:nil];
    [CollectionVW registerNib:nib2 forCellWithReuseIdentifier:@"YourCustomCell"];


    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    [flowLayout setItemSize:CGSizeMake(200, 230)];
    flowLayout.minimumInteritemSpacing = 0;
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
    [CollectionVW setCollectionViewLayout:flowLayout];

    [CollectionVW reloadData];
}

#pragma mark - COLLECTIONVIEW
#pragma mark Collection View CODE

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

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return Array.count;
}

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

    cell.MainIMG.image=[UIImage imageNamed:[Array objectAtIndex:indexPath.row]];


    return cell;
}

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

#pragma mark Collection view layout things
// Layout: Set cell size
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    CGSize mElementSize;
    mElementSize=CGSizeMake(kScreenWidth/3.4, 150);
    return mElementSize;
}


- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
    return 5.0;
}

// Layout: Set Edges
- (UIEdgeInsets)collectionView: (UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    if (isIphone5 || isiPhone4)
    {
        return UIEdgeInsetsMake(15,15,5,15);  // top, left, bottom, right
    }
    else if (isIphone6)
    {
        return UIEdgeInsetsMake(15,15,5,15);  // top, left, bottom, right
    }
    else if (isIphone6P)
    {
        return UIEdgeInsetsMake(15,15,5,15);  // top, left, bottom, right
    }

    return UIEdgeInsetsMake(15,15,5,15);  // top, left, bottom, right
}
Kaushik Movaliya
fonte
1

Documentos da Apple:

- (id)initWithFrame:(CGRect)frame 
      collectionViewLayout:(UICollectionViewLayout *)layoutParameters

Use este método ao inicializar um objeto de exibição de coleção programaticamente. Se você especificar nulo para o parâmetro layout, deverá atribuir um objeto de layout à propriedade collectionViewLayout antes de exibir a exibição da coleção na tela. Caso contrário, a exibição da coleção não poderá apresentar nenhum item na tela.

Este método é o inicializador designado.

Este método é usado para inicializar o UICollectionView. aqui você fornece quadro e um UICollectionViewLayoutobjeto.

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

No final, adicione UICollectionViewcomo a subviewà sua visualização.

Agora, a exibição de coleção é adicionada de forma programática. Você pode continuar aprendendo.
Feliz aprendizado !! Espero que ajude você.

Puneet Sharma
fonte
Mas eu li na maçã doc queThe layout object to use for organizing items. The collection view stores a strong reference to the specified object. Must not be nil.
hzxu
0
    #pragma mark -
    #pragma mark - UICollectionView Datasource and Delegates

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

    -(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
    {
        return Arr_AllCulturalButtler.count;
    }

    -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
    {
        static NSString *coll=@"FromCulturalbutlerCollectionViewCell";
        FromCulturalbutlerCollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:coll forIndexPath:indexPath];
        cell.lbl_categoryname.text=[[Arr_AllCulturalButtler objectAtIndex:indexPath.row] Category_name];
        cell.lbl_date.text=[[Arr_AllCulturalButtler objectAtIndex:indexPath.row] event_Start_date];
        cell.lbl_location.text=[[Arr_AllCulturalButtler objectAtIndex:indexPath.row] Location_name];
        [cell.Img_Event setImageWithURL:[APPDELEGATE getURLForMediumSizeImage:[(EventObj *)[Arr_AllCulturalButtler objectAtIndex:indexPath.row] Event_image_name]] placeholderImage:nil usingActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        cell.button_Bookmark.selected=[[Arr_AllCulturalButtler objectAtIndex:indexPath.row] Event_is_bookmarked];
        [cell.button_Bookmark addTarget:self action:@selector(btn_bookmarkClicked:) forControlEvents:UIControlEventTouchUpInside];
        cell.button_Bookmark.tag=indexPath.row;


        return cell;
    }
    - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
    {

        [self performSegueWithIdentifier:SEGUE_CULTURALBUTLER_KULTURELLIS_DETAIL sender:self];
    }

// stroy board navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"Overview_Register"])
    {
        WDRegisterViewController *obj=(WDRegisterViewController *)[segue destinationViewController];
        obj.str_Title=@"Edit Profile";
        obj.isRegister=NO;
    }
}

            [self performSegueWithIdentifier:@"Overview_Measure" sender:nil];



    UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    WDPeekViewController *Peek = (WDPeekViewController *)[sb instantiateViewControllerWithIdentifier:@"WDPeekViewController"];
 [self.navigationController pushViewController:tabBarController animated:YES];
Analista de qualidade
fonte
0

exame de exibição de coleção

    #import "CollectionViewController.h"
#import "BuyViewController.h"
#import "CollectionViewCell.h"

@interface CollectionViewController ()
{
    NSArray *mobiles;
    NSArray  *costumes;
    NSArray *shoes;
    NSInteger selectpath;
    NSArray *mobilerate;
    NSArray *costumerate;
    NSArray *shoerate;
}
@end

@implementation CollectionViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = self.receivename;
    mobiles = [[NSArray alloc]initWithObjects:@"7.jpg",@"6.jpg",@"5.jpg", nil];
    costumes = [[NSArray alloc]initWithObjects:@"shirt.jpg",@"costume2.jpg",@"costume1.jpg", nil];
    shoes = [[NSArray alloc]initWithObjects:@"shoe.jpg",@"shoe1.jpg",@"shoe2.jpg", nil];
    mobilerate = [[NSArray alloc]initWithObjects:@"10000",@"11000",@"13000",nil];
    costumerate = [[NSArray alloc]initWithObjects:@"699",@"999",@"899", nil];
    shoerate = [[NSArray alloc]initWithObjects:@"599",@"499",@"300", nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 3;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellId = @"cell";
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellId forIndexPath:indexPath];

    UIImageView *collectionImg = (UIImageView *)[cell viewWithTag:100];

    if ([self.receivename isEqualToString:@"Mobiles"])
    {
        collectionImg.image = [UIImage imageNamed:[mobiles objectAtIndex:indexPath.row]];
    }
    else if ([self.receivename isEqualToString:@"Costumes"])
    {
        collectionImg.image = [UIImage imageNamed:[costumes objectAtIndex:indexPath.row]];
    }
    else
    {
        collectionImg.image = [UIImage imageNamed:[shoes objectAtIndex:indexPath.row]];
    }
    return cell;
}

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

{
    selectpath = indexPath.row;
    [self performSegueWithIdentifier:@"buynow" sender:self];
}

    // In a storyboard-based application, you will often want to do a little
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"buynow"])
    {
        BuyViewController *obj = segue.destinationViewController;
        if ([self.receivename isEqualToString:@"Mobiles"])
        {
            obj.reciveimg = [mobiles objectAtIndex:selectpath];
            obj.labelrecive = [mobilerate objectAtIndex:selectpath];

        }
        else if ([self.receivename isEqualToString:@"Costumes"])
        {
            obj.reciveimg = [costumes objectAtIndex:selectpath];
            obj.labelrecive = [costumerate objectAtIndex:selectpath];
        }
        else
        {
            obj.reciveimg = [shoes objectAtIndex:selectpath];
            obj.labelrecive = [shoerate objectAtIndex:selectpath];
        }
        //     Get the new view controller using [segue destinationViewController].
        //     Pass the selected object to the new view controller.
    }
}

@end

arquivo .h

@interface CollectionViewController :
UIViewController<UICollectionViewDelegate,UICollectionViewDataSource>
@property (strong, nonatomic) IBOutlet UICollectionView *collectionView;
@property (strong,nonatomic) NSString *receiveimg;
@property (strong,nonatomic) NSString *receivecostume;
@property (strong,nonatomic)NSString *receivename;

@end
sasidharan.M
fonte
3
Como isso difere das outras 6 respostas já aqui? Ao dar uma resposta, é preferível dar uma explicação sobre POR QUE sua resposta é essa.
Stephen Rauch
0

Para quem deseja criar uma célula personalizada :

CustomCell.h


#import <UIKit/UIKit.h>

@interface HeaderCollectionViewCell : UICollectionViewCell
@property (strong,nonatomic) UIImageView *image;
@end

CustomCell.m


#import "HeaderCollectionViewCell.h"

@implementation HeaderCollectionViewCell
#define IMAGEVIEW_BORDER_LENGTH 5

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;
}


-(void)setup{
    _image = [[UIImageView alloc] initWithFrame:(CGRectInset(self.bounds, IMAGEVIEW_BORDER_LENGTH, IMAGEVIEW_BORDER_LENGTH))];
    [self addSubview:_image];

}
@end

UIViewController.h


#import <UIKit/UIKit.h>


@interface HomeViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
@property (strong,nonatomic) UICollectionView *collectionView;

@end

UIViewController.m


#import "HomeViewController.h"
#import "HomeView.h"
#import "HeaderCollectionViewCell.h"

@interface HomeViewController ()
@property (nonatomic) NSString *cellID;

@end

@implementation HomeViewController



- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = UIColor.whiteColor;

    _cellID = @"id";

    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    _collectionView = [[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];


    [_collectionView registerClass:[HeaderCollectionViewCell class] forCellWithReuseIdentifier:_cellID];



    [_collectionView setDataSource:self];
    [_collectionView setDelegate:self];

    _collectionView.backgroundColor = UIColor.redColor;


    [self.view addSubview:_collectionView];



}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 4;
}

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

    HeaderCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:_cellID forIndexPath:indexPath];

    cell.image.image = [UIImage imageNamed:@"premium-icon"];

    return cell;
}

-(UITabBarItem*) tabBarItem{
    return [[UITabBarItem alloc] initWithTitle:@"Início" image:[UIImage imageNamed:@"home-icon"] tag:0];
}


@end


mkilmer
fonte
-2
swift 4 code


//
//  ViewController.swift
//  coolectionView
//




import UIKit

class ViewController: UIViewController , UICollectionViewDataSource, UICollectionViewDelegate,UICollectionViewDelegateFlowLayout{
    @IBOutlet weak var collectionView: UICollectionView!

    var items = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.items.count
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
    {
        if indexPath.row % 3 != 0
        {
        return CGSize(width:collectionView.frame.width/2 - 7.5 , height: 100)
        }
        else
        {
            return CGSize(width:collectionView.frame.width - 10 , height: 100 )
        }
    }


    // make a cell for each cell index path
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        // get a reference to our storyboard cell
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell1234", for: indexPath as IndexPath) as! CollectionViewCell1234

        // Use the outlet in our custom class to get a reference to the UILabel in the cell
        cell.lbl1.text = self.items[indexPath.item]
        cell.backgroundColor = UIColor.cyan // make cell more visible in our example project
        cell.layer.borderColor = UIColor.black.cgColor
        cell.layer.borderWidth = 1
        cell.layer.cornerRadius = 8

        return cell
    }
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        // handle tap events
        print("You selected cell #\(indexPath.item)!")
    }



}
Dharmesh Vadachhak
fonte
Como você está vinculando esse controlador de exibição como um delegado ao layout da exibição de coleção?
andrewz