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Re: How to properly flip a UIView's coordinate system
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Re: How to properly flip a UIView's coordinate system


  • Subject: Re: How to properly flip a UIView's coordinate system
  • From: Marcel Weiher <email@hidden>
  • Date: Mon, 23 Sep 2013 13:20:37 +0200

On Sep 21, 2013, at 22:38 , Markus Spoettl <email@hidden> wrote:

>  I have a UIView on iOS that shares (a lot of) code with an NSView I have on OSX. That code relies on a LLO (lower left origin) coordinate system and it's not an option to change that.

What’s the code?  Mostly drawing?

> So I transform the coordinate system of the view by setting
>
> [self setTransform:CGAffineTransformMakeScale(1, -1)];

> in the UIView variant's -initializer. That works well, it effects all areas of view code the right way, including drawing and touch-events. Just what I want. Or so it seems.

Yeah, I have to admit I haven’t been too happy with View coordinate system transformations in general.  I just do the transform in the drawing code ( MPWView and MPWDrawingContext handle this automatically).

Since event handling code is quite distinct anyhow, I so far haven’t had a burning desire to exploit commonality there, but I’d probably do the transform “by hand” as well (encapsulated so I do it once).  Again, since you have different methods to start with, just define your own coordinate system for your own methods and map what the system gives you to that in the system-specific event methods.

Marcel


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References: 
 >How to properly flip a UIView's coordinate system (From: Markus Spoettl <email@hidden>)

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