Ios viewcontroller中的标签填充速度非常慢
我正在努力解决viewcontroller中标签数量极慢的问题 该脚本向php脚本发送用户ID。To script检索数组中与userid相关的数据,并将其作为json响应发送回我的应用程序。然后使用json数组(字典)中的相应数据填充my viewcontroller中的标签 “do{}”中的print语句会在控制台中立即执行,但是viewcontroller中标签的填充需要很长时间。将self.lblStreet.text=self.loadedStreet放在do{}之外,但仍在任务中,会得到同样缓慢的结果Ios viewcontroller中的标签填充速度非常慢,ios,json,swift3,uilabel,populate,Ios,Json,Swift3,Uilabel,Populate,我正在努力解决viewcontroller中标签数量极慢的问题 该脚本向php脚本发送用户ID。To script检索数组中与userid相关的数据,并将其作为json响应发送回我的应用程序。然后使用json数组(字典)中的相应数据填充my viewcontroller中的标签 “do{}”中的print语句会在控制台中立即执行,但是viewcontroller中标签的填充需要很长时间。将self.lblStreet.text=self.loadedStreet放在do{}之外,但仍在任务中,会
class CharDetailViewController: UIViewController {
//Outlets
@IBOutlet weak var lblUID: UILabel!
@IBOutlet weak var lblStreet: UILabel!
//URL to our web service
let URL_GET_DETAILS = "http://somesite.com/script.php"
var passedUID: String!
var loadedStreet: String!
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: URL_GET_DETAILS)
lblUID.text = passedUID
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST";
let sendUID = lblUID.text
let postParameters = "sendUID="+sendUID!;
request.httpBody = postParameters.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with:request as URLRequest){
data, response, error in
if error != nil{
print("error is \(error)")
return;
}
do{
let myJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = myJSON {
var uid : String!
uid = parseJSON["userid"] as! String?
self.loadedStreet = parseJSON["street"] as! String!
self.lblStreet.text = parseJSON["street"] as! String!
print(uid)
print(self.loadedStreet)
}
}
catch {
print(error)
}
}
task.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
您不应该在主线程之外的任何地方编辑UI。您可以使用此代码获取主线程以实现UI更新
dispatch_async(dispatch_get_main_queue(), ^{
// Update UI stuff here
});
您不应该在主线程之外的任何地方编辑UI。您可以使用此代码获取主线程以实现UI更新
dispatch_async(dispatch_get_main_queue(), ^{
// Update UI stuff here
});
在主线程上更新UI。URLSession将您置于后台线程中。Swift 3中的相应代码为
DispatchQueue.main.async {
//your UI code
}
因此,您的代码应该更像这样
class CharDetailViewController: UIViewController {
//Outlets
@IBOutlet weak var lblUID: UILabel!
@IBOutlet weak var lblStreet: UILabel!
//URL to our web service
let URL_GET_DETAILS = "http://somesite.com/script.php"
var passedUID: String!
var loadedStreet: String!
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: URL_GET_DETAILS)
lblUID.text = passedUID
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST";
let sendUID = lblUID.text
let postParameters = "sendUID="+sendUID!;
request.httpBody = postParameters.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with:request as URLRequest){
data, response, error in
if error != nil{
print("error is \(error)")
return;
}
do{
let myJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = myJSON {
var uid : String!
uid = parseJSON["userid"] as! String?
DispatchQueue.main.async {
//your UI code
self.loadedStreet = parseJSON["street"] as! String!
self.lblStreet.text = parseJSON["street"] as! String!
}
print(uid)
print(self.loadedStreet)
}
}catch {
print(error)
}
}
task.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
在主线程上更新UI。URLSession将您置于后台线程中。Swift 3中的相应代码为
DispatchQueue.main.async {
//your UI code
}
因此,您的代码应该更像这样
class CharDetailViewController: UIViewController {
//Outlets
@IBOutlet weak var lblUID: UILabel!
@IBOutlet weak var lblStreet: UILabel!
//URL to our web service
let URL_GET_DETAILS = "http://somesite.com/script.php"
var passedUID: String!
var loadedStreet: String!
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: URL_GET_DETAILS)
lblUID.text = passedUID
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST";
let sendUID = lblUID.text
let postParameters = "sendUID="+sendUID!;
request.httpBody = postParameters.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with:request as URLRequest){
data, response, error in
if error != nil{
print("error is \(error)")
return;
}
do{
let myJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = myJSON {
var uid : String!
uid = parseJSON["userid"] as! String?
DispatchQueue.main.async {
//your UI code
self.loadedStreet = parseJSON["street"] as! String!
self.lblStreet.text = parseJSON["street"] as! String!
}
print(uid)
print(self.loadedStreet)
}
}catch {
print(error)
}
}
task.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}