text height calculation

result.txt

size: {102.804, 486.74399999999957}
rect: {{0, 0}, {102.804, 486.74399999999957}}
suggestedSize: {98.6953125, 480}
rect: {{0, 0}, {100, 487}}

text-height-calculation.m

        NSString *text = @"Wikipedia (Listeni/ˌwɪkɨˈpiːdi.ə/ or Listeni/ˌwɪkiˈpiːdi.ə/ wik-i-pee-dee-ə) is a multilingual, web-based, free-content encyclopedia project supported by the Wikimedia Foundation and based on an openly editable model. The name \"Wikipedia\" is a portmanteau of the words wiki (a technology for creating collaborative websites, from the Hawaiian word wiki, meaning \"quick\") and encyclopedia. Wikipedia's articles provide links designed to guide the user to related pages with additional information.";
        UIFont *font = [UIFont systemFontOfSize:12];
        CGFloat width = 100;
    
        {
            CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(width, CGFLOAT_MAX)];
            NSLog(@"size: %@",NSStringFromCGSize(size));
        }
    
        {
            CGRect rect = [text boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX)
                                             options:NSStringDrawingUsesLineFragmentOrigin
                                          attributes:@{NSFontAttributeName:font}
                                             context:nil];
            
            NSLog(@"rect: %@",NSStringFromCGRect(rect));
        }
        
        {
            // http://stackoverflow.com/questions/19377421/ctframesettersuggestframesizewithconstraints-with-clipping-attributes-returning
            CFRange fitCFRange = CFRangeMake(0,0);
            NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:text];
            CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)(attributedString));
            CFDictionaryRef frameAttributes = (__bridge CFDictionaryRef)@{
                                                                          (id)kCTFrameProgressionAttributeName : @(kCTFrameProgressionTopToBottom),
                                                                          (id)kCTFramePathWidthAttributeName:@(0),
                                                                          (id)kCTFrameClippingPathsAttributeName:@[]
                                                                          //(id)kCTFramePathFillRuleAttributeName:@(kCTFramePathFillEvenOdd)
                                                                          //(id)kCTFramePathClippingPathAttributeName:
                                                                          };
            CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter,
                                                                                CFRangeMake(0, attributedString.length),
                                                                                frameAttributes,
                                                                                CGSizeMake(width,CGFLOAT_MAX),
                                                                                &fitCFRange);
            CFRelease(framesetter);
            NSLog(@"suggestedSize: %@",NSStringFromCGSize(suggestedSize));
        }
        
        {
            
            UILabel *toolLabel = [[UILabel alloc] initWithFrame:CGRectZero];
            toolLabel.font = font;
            toolLabel.numberOfLines = 0;
            toolLabel.adjustsFontSizeToFitWidth = YES;
            
            toolLabel.text = text;
            CGRect rect = [toolLabel textRectForBounds:CGRectMake(0, 0, width, CGFLOAT_MAX) limitedToNumberOfLines:0];
            NSLog(@"rect: %@",NSStringFromCGRect(rect));
        }