首页获取数据
class NewsListViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
vartableDataArr:[Any]? //用于给表格赋值于的数组
vartable:UITableView? //表格视图
overridefuncviewDidLoad() {
super.viewDidLoad()
self.table=UITableView(frame:CGRect.init(origin:SCR_Origin, size:SCR_Size), style: .plain)
self.table?.delegate=self
self.table?.dataSource=self
self.table?.rowHeight=65
self.view.addSubview(self.table!)
}
overridefuncviewWillAppear(_animated:Bool) {
leturlHandle =URLHandle()
urlHandle.getNewsData(channel:"头条", start:0, vc:self) { (jsonData:Any, success:Bool)in
ifsuccess ==false{
return
}
print(jsonData)
// 给表格数组赋值，刷新表格
self.tableDataArr= jsonDataas? [Any]
// 回UI主线程刷新表格
DispatchQueue.main.async {
self.table?.reloadData()
}
}
}
// MARK: - ------------------ UITableViewDataSource -----------
functableView(_tableView:UITableView, numberOfRowsInSection section:Int) ->Int{
ifletcount =self.tableDataArr?.count{
returncount
}
return0
}
functableView(_tableView:UITableView, cellForRowAt indexPath:IndexPath) ->UITableViewCell{
letcellIdentifier ="cell"
varcell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)
ifcell ==nil{
cell =UITableViewCell(style: .subtitle, reuseIdentifier: cellIdentifier)
}
//得到每个cell对应的字典
letcellDic =self.tableDataArr![indexPath.row]as!NSDictionary
cell?.textLabel?.text= cellDic["title"]as?String
returncell!
}
}
网络数据请求（GET）封装
classURLHandle:NSObject{
//菊花等待指示器
private var indicatorView:UIActivityIndicatorView?
//私有方法，判断有无网络连接
privatefuncconnectNetWork(vc:UIViewController) ->Bool{
if Reachability.forLocalWiFi().currentReachabilityStatus() == NotReachable && Reachability.forInternetConnection().currentReachabilityStatus() == NotReachable {
self.showAlert(message:"网络连接失败，请检查网络", vc: vc)
returnfalse
}
return true
}
//显示提示框
privatefuncshowAlert(message:String,vc:UIViewController) ->Void{
//实例化弹出视图控制器
letalertCtl =UIAlertController(title:nil, message: message, preferredStyle: .alert)
//弹出
vc.present(alertCtl, animated:true, completion:nil)
//2.5秒后自动消失
self.perform(#selector(hideAlertVC(sender:)), with: alertCtl, afterDelay:2.5)
}
//隐藏提示框
@objcfunchideAlertVC(sender:UIAlertController) ->Void{
sender.dismiss(animated:true, completion:nil)
}
//显示菊花
privatefuncshowIndicationView(v:UIViewController) {
ifindicatorView==nil{
indicatorView=UIActivityIndicatorView(activityIndicatorStyle: .gray)
//设置位置
indicatorView?.frame=CGRect(origin:CGPoint(x:SCR_Width/2-10, y:SCR_Height/2-10), size:CGSize(width:30, height:30))
//设置停止自动隐藏效果
indicatorView?.hidesWhenStopped=true
}
v.view.addSubview(indicatorView!)
indicatorView?.startAnimating()
}
//隐藏菊花
privatefunchideIndicatorView() ->Void{
if indicatorView != nil && (indicatorView?.isAnimating)! {
indicatorView?.startAnimating()
indicatorView?.removeFromSuperview()
indicatorView=nil
}
}
// 私有方法，使用GET请求数据
privatefuncGET(url:String,paramDic:[String:String]?,vc:UIViewController,pass:@escaping(Any,Bool)->Void) {
//判断没有网络连接，直接跳出方法调用
if!self.connectNetWork(vc: vc) {
pass("error",false) //调用闭包，返回数据
return
}
//开始转动菊花
self.showIndicationView(v: vc)
//须要将所有的参数拼接到网址字符串上
varurlStr = url
ifletpDic = paramDic {
//拼接?
urlStr.append("?")
//遍历参数再点，将键值对拼接到字符串上
for(key,value)inpDic {
urlStr.append("\(key)=\(value)&")
}
//去掉最后一个无用的&
urlStr.remove(at: urlStr.index(before: urlStr.endIndex))
//如果带汉字，做转码处理
urlStr = urlStr.addingPercentEncoding(withAllowedCharacters:CharacterSet.urlFragmentAllowed)!
}
//将字符串转换为url
letMURL =URL.init(string: urlStr)
//将URL封装为Request对象
letreq =URLRequest(url: MURL!, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval:10.0)
//网络会话对象，请求网络数据
URLSession.shared.dataTask(with: req) { (data:Data?, response:URLResponse?, error:Error?)in
//回到UI主线程，停止菊花转动
DispatchQueue.main.async {
self.hideIndicatorView()
}
//如果服务器错误给客户提示，结束执行
iflet_= error {
//回到UI主线程给客户弹框提示
DispatchQueue.main.async{
self.showAlert(message:"服务器连接超时", vc: vc)
}
pass("error",false) //调用闭包，返回数据
return
}
//JSON解析
letjsonData =try?JSONSerialization.jsonObject(with: data!, options: .allowFragments)
ifjsonData ==nil{
DispatchQueue.main.async{
self.showAlert(message:"网络数据错误", vc: vc)
}
pass("error",false)
return
}
pass(jsonData!,true)
}.resume()
}
// 私有方法，使用POST请求数据
privatefuncPOST(url:String,paramDic:[String:String],vc:UIViewController,pass:(Any,Bool)->Void) {
}
// 接口，用于获取新闻数据
publicfuncgetNewsData(channel:String,start:Int,vc:UIViewController,completion:@escaping(Any,Bool)->Void) {
//请求网址字符串
let url = "http://api.jisuapi.com/news/get"
// 将请求参数做成字典
letparamDic = ["channel":channel,
"start":"\(start)",
"num":"20",
"appkey":"de394933e1a3e2db"]
//使用get请求网络数据
self.GET(url: url, paramDic: paramDic, vc: vc) { (jsonData, success)in
if!success {
completion("error",false)
return
}
//获取status字段，判断值不为0，表示失败，给客户提示
letstatus = (jsonDataas!NSDictionary).value(forKey:"status")as!NSString
ifstatus.intValue!=0{
letmsg = (jsonDataas!NSDictionary).value(forKey:"msg")as!String
DispatchQueue.main.async{
self.showAlert(message: msg, vc: vc)
}
completion("error",false)
return
}
//获取result字典
letresultDic = (jsonDataas!NSDictionary).value(forKey:"result")as!NSDictionary
//获取result字典中的list数组
letlistArr = resultDic.value(forKey:"list")as!NSArray
//
completion(listArr,true)
}
}
//请求学生名单数据
funcgetAllStudents(vc:UIViewController,completion:@escaping(Any,Bool)->Void) {
//网址字符串
let urlStr = "http:127.0.0.1/Students.json"
self.GET(url: urlStr, paramDic:nil, vc: vc) { (data, success)in
if!success {
completion("error",false)
return
}
completion(data,true)
}
}
}
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