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iOS Introduction to Auto Layout in iOS Auto Layout in Code Blues and Purples

Posted by Justin Porter
Justin Porter
7,481 Points

Code Challenge not compiling - 'NSLayoutAttribute' has no member 'width'

My code will not compile in the next code challenge, I am getting 4 errors, all of them the same:

swift_lint.swift:344:23: error: type 'NSLayoutAttribute' has no member 'height' attribute: .height,

I am getting these errors on each NSLayoutAttribute case I am using: .centerX, centerY, .width, .height

Not sure if this is something I am doing wrong or if the linter is having issues...

My Code:

class MyViewController: UIViewController {

    let sampleView = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(sampleView)
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        sampleView.translatesAutoresizingMaskIntoConstraints = false

        // Add constraints below
        let sampleViewCenterX = NSLayoutConstraint(
          item: sampleView, 
          attribute: .centerX, 
          relatedBy: .equal, 
          toItem: view, 
          attribute: .centerX, 
          multiplier: 1.0, 
          constant: 0.0)

        let sampleViewCenterY = NSLayoutConstraint(
          item: sampleView, 
          attribute: .centerY, 
          relatedBy: .equal, 
          toItem: view, 
          attribute: .centerY, 
          multiplier: 1.0, 
          constant: 0.0)

        let sampleViewWidth = NSLayoutConstraint(
          item: sampleView, 
          attribute: .width, 
          relatedBy: .equal, 
          toItem: nil, 
          attribute: .notAnAttribute, 
          multiplier: 1.0, 
          constant: 50.0)

        let sampleViewHeight = NSLayoutConstraint(
          item: sampleView, 
          attribute: .height, 
          relatedBy: .equal, 
          toItem: nil, 
          attribute: .notAnAttribute, 
          multiplier: 1.0, 
          constant: 50.0)

        view.addConstraints([sampleViewWidth, sampleViewHeight, sampleViewCenterX, sampleViewCenterY])
    }
}

1 Answer

Martel Storm
Martel Storm
4,157 Points
Martel Storm
Martel Storm
4,157 Points

I see nobody ever answered your question and now you almost have 7,000 ios points, and that's pretty freaking cool Justin. Would you take a look at my code? I also would like to ask you a few questions about your progression.

https://teamtreehouse.com/community/constraints-in-code-code-challenge-it-says-i-cant-use-an-array-i-say-bologna-where-did-i-mess-up