A bug ? Property in an extension of UIView

Question

I created an extension for the UIView:

import UIKit

extension UIView {

    var frameHeight : CGFloat {

        get {
            return self.frame.size.height
        }
        set(newHeight) {
            self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y,self.frame.size.width, newHeight)
        }
    }
}

Then I used this inside the method of my own UIView:

class MyView: UIView {

   func updateHeight() {

        self.frameHeight = 200.0
        setNeedsDisplay()
    }
}

I got a compile error:

While emitting IR SIL function @_TFC15Simple15MyView10updateHeightfS0_FT_T_ for 'updateHeight' at /MyView.swift:88:5
<unknown>:0: error: unable to execute command: Segmentation fault: 11
<unknown>:0: error: swift frontend command failed due to signal (use -v to see invocation)
Command /Applications/Xcode6-Beta3.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254

When I comment out the line self.frameHeight = 200.0, the compile error is gone.

Is it a bug? Or did I do something wrong? Thanks.

Try a full clean (command-shift-option-K) and then compile again. — Undo, Jul 11 '14 at 16:04
A there any workaround? Or the only way is to wait for Apple to fix the bug ? — Bagusflyer, Jul 12 '14 at 04:07

score 1 · Accepted Answer · answered Jul 14 '14 at 10:33

1

It works when I run it in a Playground and I don't see anything obviously wrong.

In any case, even if it is a bug in your code, it shouldn't crash the compiler. I think you should create a bug report with Apple.

answered Jul 14 '14 at 10:33

Stephen Darlington

51,577
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When I run this in Playground (actually not run but only input to the playground, the Xcode crashes. – Bagusflyer Jul 14 '14 at 12:15
You should definitely raise a bug then. It's difficult to suggest a workaround if its behaviour varies depending on the environment. – Stephen Darlington Jul 14 '14 at 13:49
Yes. I'll do that. Thanks for your reply anyway. – Bagusflyer Jul 15 '14 at 00:57
I did another test by using UIKit in playground. Yes, it works in playground but not in my project code. – Bagusflyer Jul 16 '14 at 03:25
The funny thing is I reported to Apple and it's gone now. But the problem is still not solved. – Bagusflyer Aug 04 '14 at 00:37

score 0 · Answer 2 · answered Aug 03 '14 at 19:41

0

You have to declare your func as mutating.

answered Aug 03 '14 at 19:41

NRitH

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A bug ? Property in an extension of UIView

2 Answers2