How to use collectionview flow layout to get corre

问题:

I am using this code to get correct type but not getting the view what i want can any one tell me where am i wrong

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    screenSize = UIScreen.main.bounds
    screenWidth = screenSize.width
    screenHeight = screenSize.height
    videosCollectionView.delegate = self
    videosCollectionView.dataSource = self
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 4
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = videosCollectionView.dequeueReusableCell(withReuseIdentifier: "Videos", for: indexPath as IndexPath) as! VideosCollectionViewCell
    cell.mainImgVw.image = logoImage[indexPath.row]
    cell.durationLabel.text = "duration"
    cell.nameLabel.text = "Test Video"
    return cell

}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let xPadding = 10
    let spacing = 10
    let rightPadding = 10
    let width = (CGFloat(UIScreen.main.bounds.size.width) - CGFloat(xPadding + spacing + rightPadding))/2
    let height = CGFloat(215)

    return CGSize(width: width, height: height)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsetsMake(10, 10, 10, 10)
}

and what i am getting

Please tell me where i am wrong. Please help me.

My storyboard is like this

回答1:

As you have told that you want to use collectionViewFlowDelegateLayout. So, you have to set all values 0 from storyboard as I have shown below.

Then you have to write this code in your viewcontroller class.

This method is used for set the cell size in collection view.

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let xPadding = 10
        let spacing = 10
        let rightPadding = 10
        let width = (CGFloat(UIScreen.main.bounds.size.width) - CGFloat(xPadding + spacing + rightPadding))/2
        let height = CGFloat(215)

        return CGSize(width: width, height: height)
    }

This method is used for the margins to apply to content in the specified section.

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return UIEdgeInsetsMake(10, 10, 10, 10)
    }

This method is used for spacing between successive rows or columns of a section.

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 10
    }

回答2:

Your code works fine and there isn't any problem, check Min Spacing in Size Inspector tab it should be too large, set it 10

回答3:

Try this :-

 func collectionView(_ collectionView: UICollectionView,
                layout collectionViewLayout: UICollectionViewLayout,
                sizeForItemAt indexPath: IndexPath) -> CGSize {

      return CGSize(width: (self.view.frame.width - 8) / 3.0 , height: (self.view.frame.width - 8) / 3.0)
 }

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {

    return UIEdgeInsetsMake(8, 8, 0, 8)
}

Hope it will help you

回答4:

Declare UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout

Set min space for cell and for line from storyboard like this.

Set collectionview cell width like this,

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    var cellWidth:CGFloat = (collectionView.frame.size.width - 20) / 2;  

    return CGSize(width: cellWidth, height: 215);
}