Completion and tidy up of iPhone app

We have an iphone app that has been developed and written by another Freelancer that was removed for issues. We need the app completed and last few bugs sorted out. It is a type of photo printing application, so involves photo roll, some simple pages to select options, entering details, and payment is via Braintree's iOS SDK. The source codes as we have it is probably 95% complete or more. The app was 100% completed, and paid for, however the Freelancer (Trendsetters) has not given us the final source codes unfortunately. Issues needing to be sorted are: Some slight UI issues - colours weird, layouts need some slight touchups App crashes on one procedure - should be a simple fix. App was working 100%, but the source codes we have dont show this. Oneline to be added to the personal data page (second address line) and then connected to our database on the other end (the backend is sorted). Email line needs a second email line for confirmation it is entered correctly. Braintree needs to be connected to our Braintree Sandbox account for testing (it was before, but again the source codes don't reflect this). Also, running analysis in xCode shows a fair amount of issues in the code - these need to be sorted so app can be uploaded to iTunes Connect for review. We are preferring a fixed sum, and can look at hourly rate variations. If you do not want to give a fixed sum but interested and can do the work QUICKLY, then please message us your hourly rate quote. Please ask any queries, screenshots can be given to clarify things if needed. We need this done ASAP, we are already 2-3 months behind schedule due to Trendsetters problem, so we want it resolved urgently.