[swift-users] UIview frame and bounds properties

[Jeff Kelley]

For this you’ll want to use computed properties. let isn’t the right choice since these aren’t constants—they change as the view resizes. Instead, computed properties using var will work:

extension UIView {

    var width: CGFloat { return frame.size.width }

}

That extension will add a width property to any UIView.


Jeff Kelley

SlaunchaMan at gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> | jeffkelley.org <http://jeffkelley.org/>
> On Apr 27, 2017, at 1:28 PM, Mohamed Salah via swift-users <swift-users at swift.org> wrote:
> 
> Thanks for your support … here you are the piece of code 
> 
> 
> 
> import UIKit
> 
> class FaceVeiw: UIView {
>     
>     /* it make error to use frame or bounds outside any functions  WHY WHY WHY */
> 
>     let width = frame.size.width // (Gives an ERROR) frame property is not known here
>     let width2 = bounds.size.width // Gives an ERROR) bound property is not know here as well
>     
>     
>     override func draw(_ rect: CGRect)
>     {
>         let w = bounds.size.width // however bounds is known here
>         let h = bounds.size.height
>         
>         let w2 = frame.size.width // frame as well known here
>         let h2 = frame.size.height
>         
>     }
>     
>     
> }
> 
> 
>> On Apr 27, 2017, at 9:23 PM, Saagar Jha <saagar at saagarjha.com <mailto:saagar at saagarjha.com>> wrote:
>> 
>> Would you mind sharing the code you’re having trouble with?
>> 
>> Saagar Jha
>> 
>>> On Apr 27, 2017, at 10:22, Mohamed Salah via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>>> 
>>> Hi , 
>>> 
>>> why UIview frame and bounds properties are not seen outside any functions ? 
>>> 
>>> please advise
>>> 
>>> thank you 
>>> Mohamed Salah 
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>>> swift-users at swift.org <mailto:swift-users at swift.org>
>>> https://lists.swift.org/mailman/listinfo/swift-users <https://lists.swift.org/mailman/listinfo/swift-users>
>> 
> 
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