sizeWithFont method is deprecated. boundingRectWithSize returns an unexpected value

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How about create new label and using sizeThatFit:(CGSize)size ??

UILabel *gettingSizeLabel = [[UILabel alloc] init];
gettingSizeLabel.font = [UIFont fontWithName:@"YOUR FONT's NAME" size:16];
gettingSizeLabel.text = @"YOUR LABEL's TEXT";
gettingSizeLabel.numberOfLines = 0;
gettingSizeLabel.lineBreakMode = NSLineBreakByWordWrapping;
CGSize maximumLabelSize = CGSizeMake(310, CGFLOAT_MAX);

CGSize expectSize = [gettingSizeLabel sizeThatFits:maximumLabelSize];

Edit: This upper code is not good for ios 7 and above, so please use below:

CGRect textRect = [myString boundingRectWithSize:maximumLabelSize   
                         options:NSStringDrawingUsesLineFragmentOrigin| NSStringDrawingUsesFontLeading
                         attributes:@{NSFontAttributeName:fontText}
                         context:nil];

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