我试图添加UICollectionView到ViewController，我需要有3个单元格“每行”，单元格之间没有空格(它应该看起来像一个网格)。单元格宽度应该是屏幕大小的三分之一，因此我认为layout.item宽度应该是相同的。但是我得到这个：
如果我减小那个大小(例如7或8像素)，它是更好的，但行中的第三个单元格不是完全可见的，我仍然有空白空间(顶部&底部，左&右)。
class ViewController: UIViewController,UICollectionViewDelegateFlowLayout,UICollectionViewDataSource {
var collectionView: UICollectionView?
var screenSize: CGRect!
var screenWidth: CGFloat!
var screenHeight: CGFloat!
override func viewDidLoad() {
super.viewDidLoad()
screenSize = UIScreen.mainScreen().bounds
screenWidth = screenSize.width
screenHeight = screenSize.height
// Do any additional setup after loading the view,typically from a nib
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 20,left: 0,bottom: 10,right: 0)
layout.itemSize = CGSize(width: screenWidth / 3,height: screenWidth / 3)
collectionView = UICollectionView(frame: self.view.frame,collectionViewLayout: layout)
collectionView!.dataSource = self
collectionView!.delegate = self
collectionView!.registerClass(CollectionViewCell.self,forCellWithReuseIdentifier: "CollectionViewCell")
collectionView!.backgroundColor = UIColor.greenColor()
self.view.addSubview(collectionView!)
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
return 20
}
func collectionView(collectionView: UICollectionView,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionViewCell",forIndexPath: indexPath) as CollectionViewCell
cell.backgroundColor = UIColor.whiteColor()
cell.layer.borderColor = UIColor.blackColor().CGColor
cell.layer.borderWidth = 0.5
cell.frame.size.width = screenWidth / 3
cell.frame.size.height = screenWidth / 3
cell.textLabel?.text = "\(indexPath.section):\(indexPath.row)"
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
添加这2行
原文链接：https://www.f2er.com/swift/321388.htmllayout.minimumInteritemSpacing = 0 layout.minimumLineSpacing = 0
所以你有：
// Do any additional setup after loading the view,typically from a nib.
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 20,right: 0)
layout.itemSize = CGSize(width: screenWidth/3,height: screenWidth/3)
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 0
collectionView!.collectionViewLayout = layout
这将删除所有的空格，并给你一个网格布局：
func collectionView(collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
if indexPath.row == 0
{
return CGSize(width: screenWidth,height: screenWidth/3)
}
return CGSize(width: screenWidth/3,height: screenWidth/3);
}
网格布局现在看起来像(我还添加了第一个单元格的蓝色背景)：
