xcode 在 api 调用 Swift 上显示活动指示器
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Display activity indicator on api call Swift
提问by AJ Sanjay
I want to display an activity indicator when api call is performed. The activity indicator should stop when the api response is received
我想在执行 api 调用时显示一个活动指示器。收到 api 响应时，活动指示器应停止
But Activity indicator is not displaying during the api call am new to swift here is my code.
但是在 api 调用期间没有显示活动指示器我是 swift 的新手，这是我的代码。
import UIKit
var ARR_states : NSArray = NSArray()
var activityIndicatorView: UIActivityIndicatorView = UIActivityIndicatorView()
var VW_overlay: UIView = UIView()
class VC_search_Course: UIViewController {
@IBOutlet weak var TBL_states :UITableView!
override func viewDidLoad() {
super.viewDidLoad()
VW_overlay = UIView(frame: UIScreen.main.bounds)
VW_overlay.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.5)
activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge)
activityIndicatorView.frame = CGRect(x: 0, y: 0, width: activityIndicatorView.bounds.size.width, height: activityIndicatorView.bounds.size.height)
activityIndicatorView.center = VW_overlay.center
VW_overlay.addSubview(activityIndicatorView)
VW_overlay.center = view.center
view.addSubview(VW_overlay)
activityIndicatorView.startAnimating()
perform(#selector(self.Places_API), with: activityIndicatorView, afterDelay: 0.01)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBAction func button_back(sender: UIButton) {
self.dismiss(animated: false, completion: nil)
}
func Places_API()
{
let STR_url = String(format: "%@/search_by_location", SERVER_URL)
let auth_tok = String(format:"%@",UserDefaults.standard.value(forKey:"auth_token") as! CVarArg)
if let url = NSURL(string:STR_url) {
let request = NSMutableURLRequest(url: url as URL)
request.httpMethod = "GET"
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.addValue(auth_tok, forHTTPHeaderField: "auth_token")
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
if error != nil {
print("\(String(describing: error))")
return
}
let temp_dictin: [AnyHashable: Any]? = ((try? JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers)) as? [AnyHashable: Any])
ARR_states = temp_dictin?["course_locations"] as! NSArray
NSLog("States response %@", ARR_states)
}
task.resume()
}
activityIndicatorView.stopAnimating()
VW_overlay.isHidden = true
}
}
This above code is not displaying activity indicator I tried changing the view background colour. and activity indicator colour but no use
上面的代码没有显示活动指示器我尝试更改视图背景颜色。和活动指示器颜色但没有用
采纳答案by Anbu.Karthik
remove your code from
删除您的代码
task.resume()
}
// activityIndicatorView.stopAnimating()
// VW_overlay.isHidden = true
and add into inside the block call your code in the following place
并添加到块内，在以下位置调用您的代码
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
// call here
activityIndicatorView.stopAnimating()
VW_overlay.isHidden = true
if error != nil {
print("\(String(describing: error))")
return
}
......
回答by Jaydeep
Swift 3.0
斯威夫特 3.0
For That what i just implement two function as below. Hope this also will help you.
为此，我只是实现了以下两个功能。希望这也能帮助你。
func showLoader(view: UIView) -> UIActivityIndicatorView {
//Customize as per your need
let spinner = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 40, height:40))
spinner.backgroundColor = UIColor.black.withAlphaComponent(0.7)
spinner.layer.cornerRadius = 3.0
spinner.clipsToBounds = true
spinner.hidesWhenStopped = true
spinner.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.white;
spinner.center = view.center
view.addSubview(spinner)
spinner.startAnimating()
UIApplication.shared.beginIgnoringInteractionEvents()
return spinner
}
And, For hide Activity Indicator
并且，对于隐藏活动指示器
extension UIActivityIndicatorView {
func dismissLoader() {
self.stopAnimating()
UIApplication.shared.endIgnoringInteractionEvents()
}
}
And, the UIViewControllerwhere you used Indicator as below.
而且，UIViewController您使用指标的位置如下。
//Show
let spinner = showLoader(view: self.view)
//Hide
spinner.dismissLoader()
回答by Mohammad Sadiq
In your response handler stop the activity indicator.
在您的响应处理程序中停止活动指示器。
func Places_API() {
activityIndicatorView.stopAnimating()
//Handle response here
}
