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我正在使用Swift作爲iOS開發人員，最近我在使用異步方式添加子視圖時遇到了一些麻煩，我正在使用dispatch_async（dispatch_get_main_queue（），但它仍然沒有工作，子視圖不是一個接一個地實時添加，但是我必須等到調用完成後UI纔會更新。我的目標是逐個添加子視圖，而for循環是實時的仍在繼續，下面是我的代碼的一部分。如果有人能幫助我，我真的很感激它。視圖不是異步添加子視圖Swift
for i in 0 ..< self.allChannels.count {
let param = Params().getEpgParams(String(self.allChannels[i].channelNumber))
uNetwork().httpRequestNoLoading(self.utilityClass.currentServer , parameters: param, method: uNetwork.METHOD.POST, parent: self) { (epgResponse, extra_information) ->() in
if(extra_information != uNetwork.EXTRA_INFORMATION.SUCCESS){
self.presentViewController(self.utilityClass.alert("Error", message: "An Unexpected Error Happened"), animated: true, completion: nil)
} else if(epgResponse == nil){
self.presentViewController(self.utilityClass.alert("Error", message: "Couldn't get any response from the server"), animated: true, completion: nil)
} else {
do {
var titleArray = [String]()
var start = [String]()
var end = [String]()
var progressArray = [Float]()
let jsonObject = try NSJSONSerialization.JSONObjectWithData(epgResponse, options: []) as! NSDictionary
if let response_object = jsonObject["response_object"] as? [[String: AnyObject]] {
for menu in response_object{
titleArray.append(menu["title"] as! String)
start.append(menu["programstart"] as! String)
end.append(menu["programend"] as! String)
progressArray.append(menu["progress"] as! Float)
}
if(titleArray.count > 0){
currentTitle = titleArray[0]
currentStart = start[0][start[0].startIndex.advancedBy(12)..<start[0].startIndex.advancedBy(12+4)]
currentEnd = end[0][end[0].startIndex.advancedBy(12)..<end[0].startIndex.advancedBy(12+4)]
progressValue = Float(progressArray[0]/100)
} else {
currentTitle = "Programet e \(self.allChannels[i].title)"
currentStart = "00:00"
currentEnd = "00:00"
progressValue = 0.5
}
dispatch_async(dispatch_get_main_queue(), {
indiSub[i].removeFromSuperview()
self.contentView = UIView(frame: CGRectMake(0, ((self.scrollView.frame.height/4) * CGFloat(i)), self.epgView.frame.width, self.scrollView.frame.height/4))
self.contentView.layer.masksToBounds = true
self.scrollView.addSubview(self.contentView)
let button = UIButton(frame: CGRectMake(0, ((self.scrollView.frame.height/4) * CGFloat(i)), self.epgView.frame.width, self.scrollView.frame.height/4))
button.tag = Int(self.allChannels[i].channelNumber)
button.addTarget(self, action: #selector(LiveTvTest.playFromEpg(_:)), forControlEvents: .TouchUpInside)
self.scrollView.addSubview(button)
let currentTime = UILabel(frame: CGRectMake((self.scrollView.frame.height/4) + 25, 0, 60, self.contentView.frame.height/3))
if currentStart.characters.count == 4{
currentTime.text = currentStart + " |"
} else if (currentStart.characters.count == 5){
currentTime.text = currentStart + " |"
}
currentTime.font = UIFont(name: "Helvetica Neue", size: 15)
currentTime.adjustsFontSizeToFitWidth = true
currentTime.textColor = UIColor(red:0.54, green:0.13, blue:0.13, alpha:1.0)
self.contentView.addSubview(currentTime)
let nextTime = UILabel(frame: CGRectMake((self.scrollView.frame.height/4) + 25, currentTime.frame.height, 60, self.contentView.frame.height/3))
if nextStart.characters.count == 4{
nextTime.text = nextStart + " |"
} else if (nextStart.characters.count == 5) {
nextTime.text = nextStart + " |"
}
nextTime.font = UIFont(name: "Helvetica Neue", size: 15)
nextTime.adjustsFontSizeToFitWidth = true
nextTime.textColor = UIColor(red:0.53, green:0.53, blue:0.53, alpha:1.0)
self.contentView.addSubview(nextTime)
})
} else {
print("something went wrong with response object")
}
} catch {
self.presentViewController(self.utilityClass.alert("Error", message: "Something went wrong, please try again later"), animated: true, completion: nil)
}
}
}
}