xamarin - How do I read a view's bounds in the OnAppearing() method? -


currently have this:

protected override void onappearing() {     var collapsedheight = reportformbuttonbar.height;     var reportformexpandedposition = reportform.bounds;     var reportformcollapsedposition = reportform.bounds;      reportformcollapsedposition.y = ( reportform.height - collapsedheight );         reportformexpandedposition.y = 0;      reportform.translateto( reportformcollapsedposition.x, reportformcollapsedposition.y, 200, easing.cubicout );      base.onappearing(); }

which supposed position reportform in collapsed position. that, need read bounds. however, bounds set x:0, y:0 width , height -1. i've been struggling long while , can't find answer.

tldr: should able read correct bounds in method? or there other way accomplish view setup?

to work view bounds, recommend overriding onsizeallocated or sizechanged event. 

//in view class protected override void onsizeallocated(double width, double height) {     base.onsizeallocated(width, height);      // retreive view bounds here.. }  //or..  reportform.sizechanged += (sender, e) => {     if(width > 0 && height > 0)     {         // retreive view bounds here..         } };

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