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POCalculate max font size that fits in a rect?
 

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    <p>I'm attempting to find the maximum font size that will fit in a given rect for a given string. The goal of the algorithm is to fill as much of the rect as possible with as large of a font as possible. My approach -- which is modified from one I found online -- does a fair job, but it often doesn't fill the entire rect. I'd love to see some collaboration on how to improve this algorithm so that everyone might benefit from it:</p> <pre><code>-(float) maxFontSizeThatFitsForString:(NSString*)_string inRect:(CGRect)rect withFont:(NSString *)fontName onDevice:(int)device { // this is the maximum size font that will fit on the device float _fontSize = maxFontSize; float widthTweak; // how much to change the font each iteration. smaller // numbers will come closer to an exact match at the // expense of increasing the number of iterations. float fontDelta = 2.0; // sometimes sizeWithFont will break up a word // if the tweak is not applied. also note that // this should probably take into account the // font being used -- some fonts work better // than others using sizeWithFont. if(device == IPAD) widthTweak = 0.2; else widthTweak = 0.2; CGSize tallerSize = CGSizeMake(rect.size.width-(rect.size.width*widthTweak), 100000); CGSize stringSize = [_string sizeWithFont:[UIFont fontWithName:fontName size:_fontSize] constrainedToSize:tallerSize]; while (stringSize.height &gt;= rect.size.height) { _fontSize -= fontDelta; stringSize = [_string sizeWithFont:[UIFont fontWithName:fontName size:_fontSize] constrainedToSize:tallerSize]; } return _fontSize; } </code></pre>
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    1. COWhen you say "fill the entire rect" you only mean on the horizontal?
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