Making UILabel's adjustsFontSizeToFitWidth and minimumFontSize play nice with multi-lined labels

NSString+KBAdditions.h

@interface NSString (KBAdditions)
- (CGFloat)fontSizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size minimumFontSize:(CGFloat)minimumFontSize;
@end

NSString+KBAdditions.m

#import "NSString+KBAdditions.h"

@implementation NSString (KBAdditions)

// Original code from http://stackoverflow.com/a/4383281/463892
- (CGFloat)fontSizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size minimumFontSize:(CGFloat)minimumFontSize {
    CGFloat fontSize = [font pointSize];
    CGFloat height = [self sizeWithFont:font constrainedToSize:CGSizeMake(size.width,FLT_MAX) lineBreakMode:UILineBreakModeWordWrap].height;
    UIFont *newFont = font;
    
    //Reduce font size while too large, break if no height (empty string)
    while (height > size.height && height != 0 && fontSize > minimumFontSize) {   
        fontSize--;  
        newFont = [UIFont fontWithName:font.fontName size:fontSize];   
        height = [self sizeWithFont:newFont constrainedToSize:CGSizeMake(size.width,FLT_MAX) lineBreakMode:UILineBreakModeWordWrap].height;
    };
    
    // Loop through words in string and resize to fit
    for (NSString *word in [self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]) {
        CGFloat width = [word sizeWithFont:newFont].width;
        while (width > size.width && width != 0 && fontSize > minimumFontSize) {
            fontSize--;
            newFont = [UIFont fontWithName:font.fontName size:fontSize];   
            width = [word sizeWithFont:newFont].width;
        }
    }
    return fontSize;
}

@end

UILabel+KBAdditions.h

@interface UILabel (KBAdditions)
- (void)sizeToFitMultipleLines;
@end

UILabel+KBAdditions.m

#import "UILabel+KBAdditions.h"
#import "NSString+KBAdditions.h"

@implementation UILabel (KBAdditions)

- (void)sizeToFitMultipleLines {
    if (self.adjustsFontSizeToFitWidth) {
        CGFloat adjustedFontSize = [self.text fontSizeWithFont:self.font constrainedToSize:self.frame.size minimumFontSize:self.minimumFontSize];
        self.font = [self.font fontWithSize:adjustedFontSize];
    }
    [self sizeToFit];
}

@end

Fork removing deprecated warnings on iOS7.

https://gist.github.com/mkubenka/d886c534f7082db00540