// (1) 在view中创建controlllerview 并且新建一个继承controlllerviewcell的类 两个继承nsobject类一个做model一个做请求数据的类
import UIKit
class ViewController: UIViewController ,UICollectionViewDelegate,UICollectionViewDataSource{
var readID = "readID"
var flowlayout = UICollectionViewFlowLayout()
var collection: UICollectionView?
var collecArr:[SwiftModel]?
// var collecArr = ["3","1","2"]
override func viewDidLoad() {
super.viewDidLoad()
// 设置网格的大小
flowlayout.itemSize = CGSize(width:self.view.frame.size.width/4, height: 100)
//设置最小行间距
flowlayout.minimumLineSpacing = 1
//设置最小列间距
flowlayout.minimumInteritemSpacing = 40
//设置分区缩进量
flowlayout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 20, right: 10)
// 设置滚动方向
flowlayout.scrollDirection = UICollectionViewScrollDirection.vertical
// 网格对象
collection = UICollectionView(frame:CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height) , collectionViewLayout: flowlayout)
// 设置代理协议
collection?.delegate = self
collection?.dataSource = self
collection?.backgroundColor = UIColor.blue
collection?.register(NewsCollectionViewCell .self, forCellWithReuseIdentifier: readID)
// 添加网格
self.view .addSubview(collection!)
}
// 实现网格的协议代理
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 4
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// return collecArr.count
return 6
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// 重用cell
let cell:NewsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: readID, for: indexPath) as! NewsCollectionViewCell
if self.collecArr != nil{
let dic = self.collecArr![indexPath.item]
cell.titlelabel?.text = dic.title
}
return cell
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.requestNetWorlDataAndUpdata()
}
func requestNetWorlDataAndUpdata() -> Void {
// 转动菊花
UIApplication.shared.isNetworkActivityIndicatorVisible = true
// 请求网络数据
let urlService = Network()
urlService.getNewsData(channel: "头条", startSum: 0) { (data, success) in
// 停止指示器
DispatchQueue.main.async {
UIApplication.shared.isNetworkActivityIndicatorVisible = false
}
// 如果不成功
if !success{
// 异步执行
DispatchQueue.main.async {
let alertVC = UIAlertController(title: nil, message: data as? String, preferredStyle: .alert)
let confirmBtn = UIAlertAction(title: "确定", style: .default, handler: nil)
alertVC.addAction(confirmBtn)
self.present(alertVC, animated: true, completion: {
})
}
return
}
self.collecArr = data as? [SwiftModel]
print(self.collecArr)
DispatchQueue.main.async {
self.collection?.reloadData()
}
}
}
}
(2) model里的代码
class SwiftModel: NSObject {
var time:String = ""
var title:String = ""
var pic:String = ""
var content:String = ""
var weburl:String = ""
}
(3) 请求数据
import UIKit
class Network: NSObject {
func getNewsData(channel:String,startSum:Int,complation:@escaping (Any,Bool) -> Void) -> Void {
// get 请求网络数据
// (1) 网址字符串拼接
var urlStr = "http://api.jisuapi.com/news/get?channel=\(channel)&start=\(startSum)&num=10&appkey=de394933e1a3e2db"
// (2) 转码
urlStr = urlStr.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlFragmentAllowed)!
// (3) 分装为URL对象
let url = URL(string: urlStr)
// (4) 分装为urlrequest对象
let req = URLRequest(url: url!, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: 10.0)
// (5) 使用urlsession请求网络数据
let task:URLSessionDataTask = URLSession.shared.dataTask(with: req) { (data, response, error) in
// 如果发生错误
if error != nil{
// 参数闭包的调用
complation("网络服务错误",false)
return
}
// json 数据解析
let jsonData = try? JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments)
// json 解析失败 返回错误
if jsonData == nil{
complation("网络数据错误",false)
return
}
let status = (jsonData as! NSDictionary) .value(forKey: "status")as! String
let msg = (jsonData as! NSDictionary).value(forKey: "msg") as! String
if Int(status)! != 0{
complation(msg,false)
return
}
let result = (jsonData as! NSDictionary).value(forKey: "result") as! NSDictionary
let list = (result.value(forKey: "list") as! NSArray)
var arr:[SwiftModel] = []
for item in list{
let dic = (item as! NSDictionary)
let oneNew = SwiftModel()
oneNew.title = dic.value(forKey: "title") as! String
oneNew.content = dic.value(forKey: "content") as! String
oneNew.time = dic.value(forKey: "time") as! String
oneNew.pic = dic.value(forKey: "pic") as! String
oneNew.weburl = dic.value(forKey: "weburl") as! String
print(oneNew.title)
arr.append(oneNew)
}
complation(arr,true)
}
// (6)开启任务
task .resume()
}
}
(7) controllerviewcell中的代码
import UIKit
class NewsCollectionViewCell: UICollectionViewCell {
// 创建两个label
var titlelabel:UILabel?
var handlabel:UILabel?
override init(frame: CGRect) {
super .init(frame: frame)
self.titlelabel = UILabel()
self.addSubview(titlelabel!)
self.handlabel = UILabel()
self.addSubview(handlabel!)
setTitle()
sethand()
}
func setTitle(){
self.titlelabel?.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: 20)
self.titlelabel?.font = UIFont .systemFont(ofSize: 14.0)
self.titlelabel?.backgroundColor = UIColor.red
self.titlelabel?.numberOfLines = 0
}
func sethand() {
self.handlabel?.frame = CGRect(x: 0, y: 20, width: self.frame.size.width, height: 80)
self.handlabel?.font = UIFont .systemFont(ofSize: 12.0)
self.handlabel?.backgroundColor = UIColor.green
self.handlabel?.numberOfLines = 0
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
作者：J_2009
链接：https://www.jianshu.com/p/c2f256495a6e
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。
