ios - didSelectRowAtIndexPath 之后的延迟

Question

我有一个带有自定义单元格的表格 View ，当我点击我的一个单元格时，它会按原样显示下一个 View Controller ，但会有延迟，有时会长达 5 秒。

我怎样才能摆脱延迟？

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let person = persons[indexPath.row]

    var personViewController: PersonViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PersonViewController") as PersonViewController

    personViewController.name = person.name
    personViewController.imageName = person.image

    self.presentViewController(personViewController, animated: true, completion: nil)
}

人物 View Controller

import UIKit

class PersonViewController: UIViewController {

@IBOutlet weak var personImage: UIImageView!
@IBOutlet weak var overlayImage: UIImageView!
@IBOutlet weak var nameLabel: UILabel!

var name: String?
var imageName: String?

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    self.personImage.image = UIImage(named: imageName!)
    self.overlayImage.image = UIImage(named: "image_overlay.png") //this is a filter
    self.nameLabel.text = imageName
}

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

Answer 1

我有同样的问题，看来这是iOS的一个错误。使用以下解决方案解决。

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 
    Int64(0 * Double(NSEC_PER_SEC))), 
    dispatch_get_main_queue()) { () -> Void in
        self.presentViewController(personViewController, animated: true,completion: nil)
    }

Swift3 版本:

DispatchQueue.main.async {
    self.presentViewController(personViewController, animated: true,completion: nil)
}