[nfbcs] Specific swift errors

[Jessica Dail]

Hi,
I’m not sure where they’re from, so I’ll send my whole code.

Here it is.

      let button = UIButton()
    button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
        button.frame = CGRect(x: 400, y: 300, width: 500, height: 50)
        button.backgroundColor = UIColor.black
        button.setTitle("start ", for: .normal)
        self.view.addSubview(button)
    }
    @objc func buttonAction(sender: UIButton!) {

        var update=true
var counter=0
        let timelabel=UILabel()
        var timer = Timer.scheduledTimer(timeInterval: 0.4, target: self, selector: #selector(update), userInfo: nil, repeats: true)

        
        timelabel.frame = CGRect(x: 150, y: 200, width: 200, height: 20)
        
        timelabel.text=("0")
        self.view.addSubview(timelabel)
timelabel.text=String(counter)
        
    }
    
  override   func didReceiveMemoryWarning()
    {

    

        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.

}
}







I hope this helps.

Thanks,
Jessica


> On Jul 30, 2018, at 3:19 PM, Drenth, Joe via nfbcs <nfbcs at nfbnet.org> wrote:
> 
> Hi Jessica,
> 
> It would help to see the lines of code related to those errors, because they are highly context-sensitive.
> 
> Joseph Drenth 
> Senior R&D Software Engineer 
> JBT Corporation  |  Automated Systems 
> 400 Highpoint Drive 
> Chalfont, PA  18914, USA
> E: joe.drenth at jbtc.com  P: 215 822 4457
> www.jbtc-agv.com 
> 
> 
> -----Original Message-----
> From: nfbcs [mailto:nfbcs-bounces at nfbnet.org] On Behalf Of Jessica Dail via nfbcs
> Sent: Monday, July 30, 2018 2:47 PM
> To: NFB in Computer Science Mailing List
> Cc: Jessica Dail
> Subject: [nfbcs] Specific swift errors
> 
> Hi,
> I’ll give the full list of errors I’m getting, in hopes that someone can help.
> 
> 
> 
> again/ViewController.swift:28:85: Argument of '#selector' cannot refer to variable 'update'
> again/ViewController.swift:25:13: 'update' declared here Warning Group
> again/ViewController.swift:25:13: Variable 'update' was never mutated; consider changing to 'let' constant
> again/ViewController.swift:26:5: Variable 'counter' was never mutated; consider changing to 'let' constant /Users/jessica/Dropbox/Swift/stop watch again/stop watch again/ViewController.swift:28:13: Initialization of variable 'timer' was never used; consider replacing with assignment to '_' or removing it
> 
> Does anyone know what these mean, in simple terms?
> 
> Everything I found online, is long & hard to understand.
> 
> Thanks,
> Jessica
> 
> 
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