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0

I'm trying to make something using Swift playgrounds and am confused with auto layouts. I tried to use auto layouts but am ending up with an error "Expected declaration"
Here is my code - I've only added the parts that are relevant

import Foundation
import UIKit
import SpriteKit

public class GameView : UIView{

// let GameView : UIView!
 override public init(frame: CGRect) 
 super.init(frame: CGRect(x: 0, y: 0, width: 1500, height: 1000))

 
 GameView.translatesAutoresizingMaskIntoConstraints = false



 public override func addConstraints(_ constraints: [NSLayoutConstraint]) 
 self.addConstraints([
 NSLayoutConstraint(item: GameView.self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0),
 NSLayoutConstraint(item: GameView.self, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0),
 ])
 

ios swift xcode

share|improve this question

asked Mar 23 at 18:43

Uditi Uditi

263

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Looks to me like you need to learn more about two things - a view controller's "life cycle" or "the sequence of events being fired" and how to use auto layout. (On the latter, I much prefer anchor-based code instead of your style, but either should work.) I have one more suggestions involving how both of these tie together....
  
  – dfd
  Mar 23 at 21:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I see you are placing GameView constraints inside GameView. While this *may work, why not put these in the UIViewController that instantiates GameView? If this UIView has subviews, that's the constraints you want to put inside there. (And please, do it on initialization. No sense in doing repeated work!) It's the view controller that should know things like the size of it's view and the placement of GameView in it.And to be honest? Those last 2 constraints make no sense. You're setting GameView to be centered too... itself. (At least by the code you posted.) Good luck!
  
  – dfd
  Mar 23 at 21:31
  

  
  
  
  

add a comment | 

0

I'm trying to make something using Swift playgrounds and am confused with auto layouts. I tried to use auto layouts but am ending up with an error "Expected declaration"
Here is my code - I've only added the parts that are relevant

import Foundation
import UIKit
import SpriteKit

public class GameView : UIView{

// let GameView : UIView!
 override public init(frame: CGRect) 
 super.init(frame: CGRect(x: 0, y: 0, width: 1500, height: 1000))

 
 GameView.translatesAutoresizingMaskIntoConstraints = false



 public override func addConstraints(_ constraints: [NSLayoutConstraint]) 
 self.addConstraints([
 NSLayoutConstraint(item: GameView.self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0),
 NSLayoutConstraint(item: GameView.self, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0),
 ])
 

ios swift xcode

share|improve this question

asked Mar 23 at 18:43

Uditi Uditi

263

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Looks to me like you need to learn more about two things - a view controller's "life cycle" or "the sequence of events being fired" and how to use auto layout. (On the latter, I much prefer anchor-based code instead of your style, but either should work.) I have one more suggestions involving how both of these tie together....
  
  – dfd
  Mar 23 at 21:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I see you are placing GameView constraints inside GameView. While this *may work, why not put these in the UIViewController that instantiates GameView? If this UIView has subviews, that's the constraints you want to put inside there. (And please, do it on initialization. No sense in doing repeated work!) It's the view controller that should know things like the size of it's view and the placement of GameView in it.And to be honest? Those last 2 constraints make no sense. You're setting GameView to be centered too... itself. (At least by the code you posted.) Good luck!
  
  – dfd
  Mar 23 at 21:31
  

  
  
  
  

add a comment | 

I'm trying to make something using Swift playgrounds and am confused with auto layouts. I tried to use auto layouts but am ending up with an error "Expected declaration"
Here is my code - I've only added the parts that are relevant

import Foundation
import UIKit
import SpriteKit

public class GameView : UIView{

// let GameView : UIView!
 override public init(frame: CGRect) 
 super.init(frame: CGRect(x: 0, y: 0, width: 1500, height: 1000))

 
 GameView.translatesAutoresizingMaskIntoConstraints = false



 public override func addConstraints(_ constraints: [NSLayoutConstraint]) 
 self.addConstraints([
 NSLayoutConstraint(item: GameView.self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0),
 NSLayoutConstraint(item: GameView.self, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0),
 ])
 

ios swift xcode

share|improve this question

asked Mar 23 at 18:43

Uditi Uditi

263

import Foundation
import UIKit
import SpriteKit

public class GameView : UIView{

// let GameView : UIView!
 override public init(frame: CGRect) 
 super.init(frame: CGRect(x: 0, y: 0, width: 1500, height: 1000))

 
 GameView.translatesAutoresizingMaskIntoConstraints = false



 public override func addConstraints(_ constraints: [NSLayoutConstraint]) 
 self.addConstraints([
 NSLayoutConstraint(item: GameView.self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: GameView.self, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0),
 NSLayoutConstraint(item: GameView.self, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0),
 ])
 

share|improve this question

asked Mar 23 at 18:43

Uditi Uditi

263

share|improve this question

asked Mar 23 at 18:43

Uditi Uditi

263

asked Mar 23 at 18:43

Uditi Uditi

263

asked Mar 23 at 18:43

Uditi Uditi

263

1 Answer
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0

I think you're overriding the view's addConstraints function but it's never being called. I think if you remove it and add this code to the end of your initialiser it should set up the constraints properly.

self.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
 NSLayoutConstraint(item: self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64)
])

(The last two constraints, the center X and Y, aren't doing anything because it's constraining the center X of the view to itself. Also I think you mean self where you have GameView.self)

share|improve this answer

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917

add a comment | 

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0

I think you're overriding the view's addConstraints function but it's never being called. I think if you remove it and add this code to the end of your initialiser it should set up the constraints properly.

self.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
 NSLayoutConstraint(item: self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64)
])

(The last two constraints, the center X and Y, aren't doing anything because it's constraining the center X of the view to itself. Also I think you mean self where you have GameView.self)

share|improve this answer

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917

add a comment | 

0

I think you're overriding the view's addConstraints function but it's never being called. I think if you remove it and add this code to the end of your initialiser it should set up the constraints properly.

self.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
 NSLayoutConstraint(item: self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64)
])

(The last two constraints, the center X and Y, aren't doing anything because it's constraining the center X of the view to itself. Also I think you mean self where you have GameView.self)

share|improve this answer

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917

add a comment | 

I think you're overriding the view's addConstraints function but it's never being called. I think if you remove it and add this code to the end of your initialiser it should set up the constraints properly.

self.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
 NSLayoutConstraint(item: self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64)
])

(The last two constraints, the center X and Y, aren't doing anything because it's constraining the center X of the view to itself. Also I think you mean self where you have GameView.self)

share|improve this answer

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917

self.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
 NSLayoutConstraint(item: self, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 64),
 NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64)
])

share|improve this answer

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917

answered Mar 23 at 20:31

Tom PearsonTom Pearson

28917