爲什麼.addSubView（...）方法在使用時重置其他對象位置？

Question

當我的應用程序按鈕被按下時，它會調用addSubView()在我的ViewController的超級視圖中添加一個新視圖。問題是，有2個按鈕來移動2個其他視圖100x100在這個相同的超視圖，當我調用addSubView（newView），我的其他2視圖的位置重置爲原點。

我的問題是，我如何添加一個保存其他視圖座標的新視圖？

import UIKit 
import AVFoundation 

class ViewController: UIViewController { 
    @IBOutlet weak var bloco1: UIView! 
    @IBOutlet weak var bloco2: UIView! 
    @IBOutlet weak var botao1: UIButton! 
    @IBOutlet weak var botao2: UIButton! 

    var bloco1Origem: CGPoint! 
    var bloco2Origem: CGPoint! 
    var corBlocos: UIColor! 
    var reprodutorDeAudio: AVAudioPlayer? 
    var somDoAlerta: NSURL! 
    var novaView: UIView! 
    var qntBlocosNovos = 0 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     let path = NSBundle.mainBundle().pathForResource("SomDeColisão", ofType: "mp3") 
     somDoAlerta = NSURL(fileURLWithPath: path!)  
     do { 
      reprodutorDeAudio = try AVAudioPlayer(contentsOfURL: somDoAlerta) 
      reprodutorDeAudio!.prepareToPlay() 
     } catch { 
      print(error)   
     } 
    } 

    override func viewWillAppear(animated: Bool) { 
     bloco1.backgroundColor = corBlocos 
     bloco2.backgroundColor = corBlocos 
    } 

    override func viewDidAppear(animated: Bool) { 
     bloco1Origem = bloco1.frame.origin 
     bloco2Origem = bloco2.frame.origin 
    } 

    @IBAction func AddNovoBloco(sender: UIBarButtonItem) { 
     novaView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100)) 
     novaView.backgroundColor = UIColor.yellowColor() 
     self.view.addSubview(novaView) 
     //self.view.didAddSubview(novaView) 
     ++qntBlocosNovos 
    } 

    @IBAction func botao(sender: UIButton) { 
     bloco1.frame.origin.x += 10 
     if colisao() { 
      bloco2.backgroundColor = UIColor.redColor() 
      botao1.enabled = false 
      botao2.enabled = false 
     } 
//  view2.transform = CGAffineTransformMakeRotation(10) 
    } 

    @IBAction func excluirTodos(sender: UIButton) { 
     while qntBlocosNovos > 0 {   
      (view.subviews.last! as UIView).removeFromSuperview() 
      --qntBlocosNovos 
     } 
    } 

    @IBAction func botao2(sender: UIButton) { 
     if qntBlocosNovos > 0 {  
      (view.subviews.last! as UIView).removeFromSuperview() 
     } 
     bloco2.frame.origin.x -= 10 
     if colisao() {   
      bloco1.backgroundColor = UIColor.redColor() 
      botao1.enabled = false 
      botao2.enabled = false 
     } 
    } 

    func colisao() -> Bool { 
     if CGRectIntersectsRect(bloco1.frame, bloco2.frame) { 
      guard let rep = reprodutorDeAudio else { 
       return true    
      } 
      rep.play() 
      return true 
     } 
     return false 
    } 

    @IBAction func Reinicia(sender: UIButton) { 
     bloco1.frame.origin = bloco1Origem 
     bloco2.frame.origin = bloco2Origem 
     botao1.enabled = true 
     botao2.enabled = true 
    } 

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

Answer 1

自動佈局運行和移動你的意見。有兩種方法可以解決這個問題：

1）完全用代碼定義您的bloco1和bloco2視圖。不要在Interface Builder中定義它們，也不要使用@IBOutlets。如果你這樣做，Autolayout不會觸及你的意見，他們會留在你把它們放在你的位置。

2）如果你想用界面生成器定義你的視圖，那麼你不應該通過改變它們的幀來移動它們。相反，您應該爲定位視圖的約束創建@IBOutlet，然後通過更改佈局約束的constant屬性來移動視圖。

要創建@IBOutlet的約束，發現在文檔大綱視圖的約束，並從代碼限制到的ViewController控制 -drag。給它起一個名字，如centerXConstraint。它會出現在這樣的代碼：

@IBOutlet weak var centerXConstraint: NSLayoutConstraint! 

然後移動視圖，只需更新constant屬性：

centerXConstraint.constant += 10