iOS app minor corrections

I have an iPhone app that is fully functional, but needs a couple of minor amendments, as follows: 1. BMI calculator has individual text fields for Height and Weight, but needs to be updated to split the height and weight fields into 2 fields each so they calculate both Feet and Inches, and Stones and Pounds (and same for metric). This has been updated on the Storyboard, but needs to be worked out in the .m file to add the two new fields together and still return a single number for both Height and Weight to feed into the final calculation. 2. Update code so the result updates automatically when any one field is changed rather than having to hit the refresh button. This is a very quick job for an experienced developer. Please only apply if you are an experienced coder with at least 30 freelancer jobs under your belt. Write 'popdot' in your bid description so I know you've read the entire project outline. I will need to see examples of previous work, any examples of calculation-style apps will get you higher up the list. This may lead to further work for the right developer.