小编vij*_*iju的帖子

如何在Swift iOS中关闭2个视图控制器？

以下是我的代码.

@IBAction func backButtonTapped(sender: AnyObject) {
    self.presentingViewController
        .presentingViewController
        .dismissViewControllerAnimated(true, completion: nil)
}

我有麻烦了。我想在我的应用程序中播放远程 mp3 文件。但是 mp3 文件需要很长时间（大约 5-6 分钟）才能播放。为什么 ？

任何人都可以建议我该怎么办？

 import UIKit

 import AVFoundation

 class TestViewController: UIViewController, AVAudioPlayerDelegate {

 var player:AVAudioPlayer = AVAudioPlayer()

 override func viewDidLoad() {
    super.viewDidLoad()
 }

 @IBAction func play(sender: AnyObject) {

    let url = "http://www.example.com/song.mp3"

    let fileURL = NSURL(string: url.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet()))

    let soundData = NSData.dataWithContentsOfURL(fileURL, options: nil, error: nil)

    var error: NSError?
    self.player = AVAudioPlayer(data: soundData, error: &error)
    if player == nil
    {
        if let e = error
        {
            println(e.localizedDescription)
        }
    }

    player.volume   = 1.0
    player.delegate = self
    player.prepareToPlay() …

我遇到了麻烦.我有一个城市列表,我想显示城市UITableView,我已禁用UITableView的滚动,因为我不想显示滚动.

当我动态更改为UITableView的高度时,它不会更改,UITableView不会显示所有城市.代码下方.请看看.

import UIKit

class FlightDetailsOneWayViewController: UIViewController {

var flightDetailArr:[FlightDetailsOneWay]  =  [FlightDetailsOneWay]()

@IBOutlet var tableView: UITableView!

@IBOutlet var scrollview: UIScrollView!

override func viewDidLoad() {
    super.viewDidLoad()

    flightDetailArr.append(FlightDetailsOneWay(depCity: "London"))

    flightDetailArr.append(FlightDetailsOneWay(depCity: "China"))

    flightDetailArr.append(FlightDetailsOneWay(depCity: "Singapore"))

    flightDetailArr.append(FlightDetailsOneWay(depCity: "Dubai"))


    self.tableView.scrollEnabled = false

    var cellHeight  = CGFloat(self.tableView.rowHeight)

    var totalCity   = CGFloat(flightDetailArr.count)

    var totalHeight = cellHeight * totalCity

    self.tableView.frame.size.height = CGFloat(totalHeight)


}

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


   func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int   { …