ios - When do adjustsFontSizeToFitWidth or boundingRectWithSize change the context.actualScaleFactor? -

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when actualscalefactor of nsstringdrawingcontext change?

the documentation says:

"if specified custom value in minimumscalefactor property, when drawing complete, property contains actual scale factor value used draw string."

my code:

mybutton.titlelabel!.font = uifont(name: "americantypewriter-bold", size: 40) mybutton.titlelabel?.adjustsfontsizetofitwidth = true mybutton.settitle("\(textstring)", forstate: .normal)  let attributes = [nsfontattributename : mybutton.titlelabel!.font] let attributedstring = nsmutableattributedstring(string:textstring, attributes:attributes)  let context = nsstringdrawingcontext() context.minimumscalefactor = mybutton.titlelabel!.minimumscalefactor  print("context: \(context.actualscalefactor)")  let resultingrect = attributedstring.boundingrectwithsize(mybutton.titlelabel!.bounds.size, options: .useslinefragmentorigin, context: context)  print("actual context after drawing: \(context.actualscalefactor)")  //want font size after adjustsfontsizetofitwidth has done magic:       //let actualfontsize = mybutton.titlelabel!.font.pointsize * context.actualscalefactor

console log both text fits without being shrunk , longer text adjusted fit label's width both same:

context: 0.0 actual context after drawing: 1.0

any idea step missing real scalefactor context after text has been sized fit label?

do in viewdidappear... worked me


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