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copied!<p>I wrote the following recursive method and public API to do this properly. The ugly fudge factor is the subject of <a href="https://stackoverflow.com/questions/1095545/string-length-with-given-font-to-fit-uitextview-2-the-return">this question</a>.</p> <pre><code>#define kFudgeFactor 15.0 #define kMaxFieldHeight 9999.0 // recursive method called by the main API -(NSString*) sizeStringToFit:(NSString*)aString min:(int)aMin max:(int)aMax { if ((aMax-aMin) <= 1) { NSString* subString = [aString substringToIndex:aMin]; return subString; } int mean = (aMin + aMax)/2; NSString* subString = [aString substringToIndex:mean]; CGSize tallerSize = CGSizeMake(self.frame.size.width-kFudgeFactor,kMaxFieldHeight); CGSize stringSize = [subString sizeWithFont:self.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap]; if (stringSize.height <= self.frame.size.height) return [self sizeStringToFit:aString min:mean max:aMax]; // too small else return [self sizeStringToFit:aString min:aMin max:mean];// too big } -(NSString*)sizeStringToFit:(NSString*)aString { CGSize tallerSize = CGSizeMake(self.frame.size.width-kFudgeFactor,kMaxFieldHeight); CGSize stringSize = [aString sizeWithFont:self.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap]; // if it fits, just return if (stringSize.height < self.frame.size.height) return aString; // too big - call the recursive method to size it NSString* smallerString = [self sizeStringToFit:aString min:0 max:[aString length]]; return smallerString; } </code></pre>

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