在我的viewcontroller中，我添加了一个带有xib的子视图，我在xib中设置了autolayout，但是当我将视图添加到视图控制器时它不起作用

Question

first I have my custom view named FindFriendHeadPublish.h,which contains a xib file as follows,I have set the autolayout,and the view is OC

and my view controller which named PreviewViewController.swift also has a xib and I add the FindFriendHeadPublish view to the view controller, but the autolayout in the FindFriendHeadPublish doesn't work

    override func viewDidLoad() {
    super.viewDidLoad()
    self.title = "我的卡片预览"
    var addpreviewView = NSBundle.mainBundle().loadNibNamed("FindFriendHeadPublish", owner: nil, options: nil)
    var previewView = addpreviewView.last as! FindFriendHeadPublish
    previewView.setTranslatesAutoresizingMaskIntoConstraints(false);
    GetUserInfoInterface.getUserInfoWithFUid(UserInfoSaveUtil.getUserInfo().userid, withBlock: { (userInfo:GetUserInfoVo!  , error:NSError! ) -> Void in

})

self.scrollView.contentSize = CGSizeMake(320, 640)
self.scrollView.addSubview(previewView)

}

I have check some other problems , but I haven't find a solution, any one can help, thank you

further more, the custom view works well in another viewcontroller which write in OC

and the code above works as follows

Answer 1

First of all add Hieght Constraint to previewView in the nib then add the following code after previewView.setTranslatesAutoresizingMaskIntoConstraints(false);

var constraints: NSMutableArray = NSMutableArray()
constraints.addObject(NSLayoutConstraint(item: previewView, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: self.scrollView, attribute: NSLayoutAttribute.Top, multiplier: 1.0, constant: 0.0))
constraints.addObject(NSLayoutConstraint(item: previewView, attribute: NSLayoutAttribute.Left, relatedBy: NSLayoutRelation.Equal, toItem: self.scrollView, attribute: NSLayoutAttribute.Left, multiplier: 1.0, constant: 0.0))
constraints.addObject(NSLayoutConstraint(item: previewView, attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: self.scrollView, attribute: NSLayoutAttribute.Right, multiplier: 1.0, constant: 0.0))
self.scrollView.addConstraints(constraints as [AnyObject])

Hope that helps.

Answer 2

You did not set the constraints for previewView and its superview, which you cant do in IB if the views are not in one file.

previewView.setTranslatesAutoresizingMaskIntoConstraints(false);
let viewBindingsDict = ["previewView":previewView, "view":self.view]
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[previewView(==view)]", options: nil, metrics: nil, views: viewBindingsDict))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[previewView]", options: nil, metrics: nil, views: viewBindingsDict))

this example sets the previewView top left with the width of the controllers view. a nice tutorial: http://www.thinkandbuild.it/learn-to-love-auto-layout-programmatically/

it is recommended to use only one view in a scrollview and use it as container for the others. if you load a nib and set the owner to self