在我的应用程序中,我有这个类从我的服务器获取数据：
class Api{
func loadOffers(completion:(([Offers])-> Void),offer_id: String,offerStatus:String){
let myUrl = NSURL(string: "http://www.myServer.PHP/api/v1.0/offers.PHP")
let request = NSMutableuRLRequest(URL: myUrl!)
request.HTTPMethod = "POST"
let postString = "offer_id=\(offer_id)&offerStatus=\(dealStatus)&action=show"
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding,allowLossyConversion: true)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request)
{ data,response,error in
if error != nil {
println("error\(error)")
}else{
var err:NSError?
let jsonObject : AnyObject! = NSJSONSerialization.JSONObjectWithData(data,options: NSJSONReadingOptions.MutableContainers,error: nil)
if let dict = jsonObject as? [String: AnyObject] {
if let myOffers = dict["offers"] as? [AnyObject] {
var offers = [Offers]()
for offer in myOffers{
let offer = Offers(dictionary: offer as! NSDictionary)
offers.append(offer)
let priority = disPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority,0 )){
dispatch_async(dispatch_get_main_queue()){
completion(offers)
}
}
}
}
}
}
}
task.resume()
}
}
然后在我的View Controller中加载模型：
class MyViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {
var offers: [Offers]!
func loadModel() {
let loadingNotification = MBProgressHUD.showHUDAddedTo(self.view,animated: true)
loadingNotification.mode = MBProgressHUDMode.Indeterminate
loadingNotification.labelText = "updating your offers..."
offers = [Offers]()
let api = Api()
api.loadOffers(didLoadOffers,offer_id: dealIdent!,offerStatus: "open")
}
func didLoadOffers(offers:[Offers]){
self.offers = offers
self.tableView.reloadData()
MBProgressHUD.hideAllHUDsForView(self.view,animated: true)
self.refreshControl.endRefreshing()
}
override func viewWillAppear(animated: Bool) {
loadModel()
}
}
除了当JSON字典为空时,一切都有效,这意味着没有提供MBProgressHUD保持旋转.
我想停止活动指示器添加一个子视图,而不是说没有优惠.任何建议将不胜感激.
我试过了：
if offers.isEmpty {
MBProgressHUD.hideAllHUDsForView(self.view,animated：true)
}
并且
if offers == 0 {
MBProgressHUD.hideAllHUDsForView(self.view,animated：true)
}
但它不起作用
谢谢
解决方法
发生这种情况是因为您在主队列中设置了HUD,但正试图从另一个队列中删除.所有与UI相关的更改都应该在main_queue()中完成
尝试使用此代码
dispatch_async(dispatch_get_main_queue(),{
// your code to modify HUD here
});