无法隐藏API调用结束时的活动指示器

Question

我有一个表格视图，其中数据是从API调用中加载的。我显示一个加载覆盖视图。我使用下面的代码来设置加载整体视图。

https://coderwall.com/p/su1t1a/ios-customized-activity-indicator-with-swift

但问题是，我似乎无法隐藏覆盖视图或活动的指标，一旦表视图已经被加载。它只是继续加载。

要启动活动的指标，使用下面的代码：

ViewControllerUtils().showActivityIndicator(self.view) 

阻止它：

ViewControllerUtils().hideActivityIndicator(self.view) 

我的API调用代码如下：

import UIKit 

class BioListTableViewController: UITableViewController { 

// variable to hold the index value of the cell tapped 
var cellTapped = Int() 


@IBOutlet var tableview: UITableView! 

var bioArray = NSArray(){ 
    didSet{ 

     dispatch_async(dispatch_get_main_queue()){ 
       self.tableview.reloadData() 
      }}} 


override func viewDidLoad() 
{ 
    super.viewDidLoad() 
    self.tableView.rowHeight = 80.0 



    // A switch Statement to check which cell was tapped and which API link to call 
    switch cellTapped 
    { 

     case 0: 
     test() 
     case 1: 
     test() 
     default: 
     test() 

    } 

    } 

override func viewDidAppear(animated: Bool) 
{ 
    ViewControllerUtils().hideActivityIndicator(self.view) 
} 

func test() { 


    ViewControllerUtils().showActivityIndicator(self.view) 
    println("This is TWEST") 

    var request = NSMutableURLRequest(URL: NSURL(string: "APILink")!) 
    var session = NSURLSession.sharedSession() 
    request.HTTPMethod = "GET" 
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true 


    var err: NSError? 

    request.addValue("application/json", forHTTPHeaderField: "Content-Type") 
    request.addValue("application/json", forHTTPHeaderField: "Accept") 

    var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in 
    println("Response: \(response)") 
    var strData = NSString(data: data, encoding: NSUTF8StringEncoding) 
    println("Body: \(strData)") 
    var err: NSError? 
    var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSArray 

    UIApplication.sharedApplication().networkActivityIndicatorVisible = true 


    // Did the JSONObjectWithData constructor return an error? If so, log the error to the console 
    if(err != nil) { 

    println(err!.localizedDescription) 
    let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding) 
    println("Error could not parse JSON: '\(jsonStr)'") 

    dispatch_async(dispatch_get_main_queue()) { 

    var alert = UIAlertController(title: "Alert", message: "Seems to be an error with server. Try Again Later", preferredStyle: UIAlertControllerStyle.Alert) 
    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil)) 
    self.presentViewController(alert, animated: true, completion: nil) 

    }} 
    else { 

    UIApplication.sharedApplication().networkActivityIndicatorVisible = false 
     //To to long tasks 
     // LoadingOverlay.shared.hideOverlayView() 
    // The JSONObjectWithData constructor didn't return an error. But, we should still 
    // check and make sure that json has a value using optional binding. 
    //var newWeather = WeatherSummary(id:"") 

    if let parseJSON = json { 


    self.bioArray = parseJSON 

    } 
    else { 
    // Woa, okay the json object was nil, something went worng. Maybe the server isn't running? 
    let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding) 
    println("Error could not parse JSON: \(jsonStr)") 

    }} 

    }) 

    task.resume() 
} 

func testTwo(){ 

    println("THIS IS TEST 2") 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

// MARK: - Table view data source 

override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
    // #warning Potentially incomplete method implementation. 
    // Return the number of sections. 
    return 1 
} 

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    // #warning Incomplete method implementation. 
    // Return the number of rows in the section. 
    return self.bioArray.count ?? 0 
} 


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
    let cell = tableView.dequeueReusableCellWithIdentifier("bioCell", forIndexPath: indexPath) as! UITableViewCell 

    // Configure the cell... 

    let weatherSummary: AnyObject = bioArray[indexPath.row] 

    if let id = weatherSummary["employeeName"] as? String 
    { 
     cell.textLabel?.text = id 

    } 

    if let job = weatherSummary["sector"] as? String { 
     cell.detailTextLabel?.text = job 

    } 

    var fram = cell.imageView?.frame 
    //fram? = CGRectMake(0, 0, 50, 55) 
    let imageSize = 50 as CGFloat 
    fram?.size.height = imageSize 
    fram?.size.width = imageSize 
    cell.imageView!.frame = fram! 
    cell.imageView!.layer.cornerRadius = imageSize/2.0 
    cell.imageView!.clipsToBounds = true 
    //cell.imageView?.image = UIImage(named: "userIcon.png") 

    if let userImage = weatherSummary["userImage"] as? String{ 
     if let url = NSURL(string: userImage){ 
      if let data = NSData(contentsOfURL: url){ 
       if let image:UIImage = UIImage(data: data){ 
        cell.imageView?.image = image 
       } 

      } 
     } 

    } 


    return cell 
} 

Answer 1

您可以使用我从什么地方得到另一个定制活动的指标响应时间dissmiss它。最简单有效的一个。 （虽然它与指示文字，如果你不想要显示的文本，那么你可以自定义你的方式）

使类

class customActivityIndicator: UIVisualEffectView { 

var text: String? { 
    didSet { 
     label.text = text 
    } 
} 
let activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.White) 
let label: UILabel = UILabel() 
let blurEffect = UIBlurEffect(style: .Dark) 
let vibrancyView: UIVisualEffectView 

init(text: String) { 
    self.text = text 
    self.vibrancyView = UIVisualEffectView(effect: UIVibrancyEffect(forBlurEffect: blurEffect)) 
    super.init(effect: blurEffect) 
    self.setup() 
} 

required init(coder aDecoder: NSCoder) { 
    self.text = "" 
    self.vibrancyView = UIVisualEffectView(effect: UIVibrancyEffect(forBlurEffect: blurEffect)) 
    super.init(coder: aDecoder) 
    self.setup() 
} 

func setup() { 
    contentView.addSubview(vibrancyView) 
    vibrancyView.contentView.addSubview(activityIndicator) 
    vibrancyView.contentView.addSubview(label) 
    activityIndicator.startAnimating() 
} 

override func didMoveToSuperview() { 
    super.didMoveToSuperview() 

    if let superview = self.superview { 

     let width: CGFloat = 150 
     let height: CGFloat = 50.0 
     self.frame = CGRectMake(superview.frame.size.width/2 - width/2, 
           superview.frame.height/2 - height, 
           width,height) 

     vibrancyView.frame = self.bounds 

     let activityIndicatorSize: CGFloat = 40 
     activityIndicator.frame = CGRectMake(5, height/2 - activityIndicatorSize/2, 
      activityIndicatorSize, 
      activityIndicatorSize) 

     layer.cornerRadius = 8.0 
     layer.masksToBounds = true 

     label.text = text 
     label.textAlignment = NSTextAlignment.Center 
     label.frame = CGRectMake(activityIndicatorSize + 5, 0, width - activityIndicatorSize - 20, height) 
     label.textColor = UIColor.grayColor() 
     label.font = UIFont.boldSystemFontOfSize(16) 

    } 
} 

func show() { 
    self.hidden = false 
} 

func hide() { 
    self.hidden = true 
} 
} 

要使用此：

let spinner = customActivityIndicator(text: "Loading") 
//To start animating 
self.view.addSubview(spinner) 

//To hide 
self.spinner.hide() 

这可能会帮助你。

Answer 2

试图拒绝对主队列，你都可以从服务器

dispatch_async(dispatch_get_main_queue(), { 

      ViewControllerUtils().hideActivityIndicator(self.view) 

      }))