自动布局：设置约束后无法调整窗口大小

Question

我需要一些帮助与自动布局设置编程。我将一个视图设置为另一个由storyboard管理的视图。

var content = NSView(frame: NSRect(x: 0, y: 0, width: 3000, height: self.view.frame.height))
[...]
scrollingView.documentView = content

然后我添加pin约束，视图将始终从上到下:

    let topPinContraints = NSLayoutConstraint(
        item: contentView
        , attribute: NSLayoutAttribute.Top
        , relatedBy: .Equal
        , toItem: contentView.superview
        , attribute: NSLayoutAttribute.Top
        , multiplier: 1.0
        , constant: 0
    )
    let bottomPinContraints = NSLayoutConstraint(
          item: contentView
        , attribute: NSLayoutAttribute.Bottom
        , relatedBy: .Equal
        , toItem: contentView.superview
        , attribute: NSLayoutAttribute.Bottom
        , multiplier: 1.0
        , constant: 0
    )
    let heightContraints = NSLayoutConstraint(
        item: contentView
        , attribute: NSLayoutAttribute.Height
        , relatedBy: .Equal
        , toItem: contentView.superview
        , attribute: NSLayoutAttribute.Height
        , multiplier: 1.0
        , constant: 0
    )
    NSLayoutConstraint.activateConstraints([
          topPinContraints
        , bottomPinContraints
        , heightContraints
    ])
    contentView.needsLayout = true

NSLayoutConstraint之后。activateConstraints视图从上到下填充在父视图，，但窗口的高度是不可调整的了。我可以调整宽度，但高度现在是固定的。

我如何添加顶部和底部引脚而不失去调整大小的可能性?

谢谢你，

ps。

Answer 1

最后我有一些为我工作的代码。但这是正确的解决方案吗?我把整个ViewController贴出来给你们看我的经验。也许你可以发表你的评论，我可以做得更好。

import Foundation
import Cocoa
class ColoumnMasterViewController: NSViewController {
@IBOutlet weak var scrollingView: NSScrollView!
var position = 0
var contentView: NSView?
var widthtContraints: NSLayoutConstraint?
override func viewDidLoad() {
    contentView = NSView(frame: NSRect(x: 0, y: 0, width: 3000, height: self.view.frame.height))
    contentView!.wantsLayer = true
    contentView!.layer?.backgroundColor =  NSColor.redColor().CGColor
    add()
    var timer = NSTimer.scheduledTimerWithTimeInterval(1.6, target: self, selector: Selector("add"), userInfo: nil, repeats: true)
    scrollingView.documentView = contentView
    autoLayout(contentView!)
}
func add(){
    println("add view on position (position)")
    let vc: NSViewController = self.storyboard?.instantiateControllerWithIdentifier("coloumn_view_controller") as! NSViewController
    vc.view.setFrameOrigin(NSPoint(x: (position++ * 130), y: 0))
    vc.view.setFrameSize(NSSize(width: 130, height: self.view.frame.height))
    contentView!.addSubview(vc.view)
    updateWidth()
}
func autoLayout(contentView: NSView){
    let topPinContraints = NSLayoutConstraint(
        item: contentView
        , attribute: NSLayoutAttribute.Top
        , relatedBy: .Equal
        , toItem: contentView.superview
        , attribute: NSLayoutAttribute.Top
        , multiplier: 1.0
        , constant: 0
    )
    let bottomPinContraints = NSLayoutConstraint(
          item: contentView
        , attribute: NSLayoutAttribute.Bottom
        , relatedBy: .Equal
        , toItem: contentView.superview
        , attribute: NSLayoutAttribute.Bottom
        , multiplier: 1.0
        , constant: 0
    )
    println("heightContraints (contentView.superview!.frame.height)")
    let heightContraints = NSLayoutConstraint(
        item: contentView
        , attribute: NSLayoutAttribute.Height
        , relatedBy: .Equal
        , toItem: contentView.superview!
        , attribute: NSLayoutAttribute.Height
        , multiplier: 1.0
        , constant: 0
    )
    println("widthtContraints (contentView.superview!.frame.width)")
    let calculatedWith: CGFloat = (CGFloat) (contentView.subviews.count * 130)
    widthtContraints = NSLayoutConstraint(
        item: contentView
        , attribute: NSLayoutAttribute.Width
        , relatedBy: .Equal
        , toItem: nil
        , attribute: NSLayoutAttribute.Width
        , multiplier: 1.0
        , constant: 0
    )
    widthtContraints!.constant = calculatedWith
    NSLayoutConstraint.activateConstraints([
          topPinContraints
         , bottomPinContraints
         , heightContraints
         , widthtContraints!
    ])
    contentView.translatesAutoresizingMaskIntoConstraints = false
    contentView.needsLayout = true
}
func updateWidth(){
    let calculatedWith: CGFloat = (CGFloat) (contentView!.subviews.count * 130)
    if (widthtContraints != nil) {
        widthtContraints!.constant = calculatedWith
    }
}
}

万分感谢，

p