Swift UIcollectionView 最新写法
UIcollectionView现在多多少少写法变得有点不一样了 首先是是 collectionView 的frame设置变得不一样了 以前是collectionView = UICollectionView(frame: CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT) 用的是CGRectMAKE
现在省略了 直接就是CGRect(x: 0, y: 0, width: ScreenWidth, height: ScreenHeight)
现在直接贴所有最新代码
class ViewController: UIViewController ,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout {
var collectionView:UICollectionView?;
let CELL_ID = "cell_id";
let HEAD_ID = "head_id";
let ScreenHeight = UIScreen.main.bounds.size.height
let ScreenWidth = UIScreen.main.bounds.size.width
override func viewDidLoad() {
super.viewDidLoad();
self.view.backgroundColor = UIColor.blue;
self.title = "首页";
createCollectionView();
}
func createCollectionView() {
let flowLayout = UICollectionViewFlowLayout();
collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: ScreenWidth, height: ScreenHeight), collectionViewLayout: flowLayout)
collectionView!.backgroundColor = UIColor.orange;
collectionView!.delegate = self;
collectionView!.dataSource = self;
collectionView!.register(TSMHomeCollectionCell.self, forCellWithReuseIdentifier: CELL_ID);
collectionView!.register(TSMHomeTopCollectionReusable.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: HEAD_ID);
self.view.addSubview(collectionView!);
}
//MARK: - UICollectionView 代理
//分区数
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 3;
}
//每个分区含有的 item 个数
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 200;
}
//返回 cell
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: CELL_ID, for: indexPath) as! TSMHomeCollectionCell;
return cell;
}
//每个分区的内边距
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(10, 10, 10, 10);
}
//最小 item 间距
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 10;
}
//最小行间距
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10;
}
//item 的尺寸
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: ScreenWidth / 4.0 - 50 / 4.0, height: ScreenWidth / 4.0 - 50 / 4.0)
}
//每个分区区头尺寸
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
return CGSize (width: ScreenWidth, height: 40)
}
//返回区头、区尾实例
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
var headview = TSMHomeTopCollectionReusable();
if kind == UICollectionElementKindSectionHeader {
headview = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: HEAD_ID, for: indexPath as IndexPath) as! TSMHomeTopCollectionReusable;
}
return headview;
}
//item 对应的点击事件
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print("index is \(indexPath.row)");
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
TSMHomeCollectionCell.swift里面实现了
class TSMHomeCollectionCell: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame);
let image = UIImage(named: "head");
let imageV = UIImageView(frame:CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height));
imageV.image = image;
self.addSubview(imageV);
self.backgroundColor = UIColor.white;
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
TSMHomeTopCollectionReusable.swift实现了
class TSMHomeTopCollectionReusable: UICollectionReusableView {
override init(frame: CGRect) {
super.init(frame: frame);
self.backgroundColor = UIColor.white;
let label = UILabel(frame: CGRect(x: 0, y: 0, width: self.frame.size.width, height: self.frame.size.height));
label.text = "标题";
self.addSubview(label);
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder) has not been implemented")
}
}
虚拟机运行出来的样子
Swift刚刚入坑的可以看看哦~