Week1-temparature converter

[andyrhee]

Ready for your review.

Thanks, Andy

/cc @nesquena @timothy1ee

[timothy1ee]

Looks good!

• The mockup was deliberately ambiguous about how to handle whether to convert from Celsius to Fahrenheit or vice versa. One good option was to track which textfield was the most recently edited.
• There are two ways to register for events for a UITextField: set the delegate or use the generic control events in Interface Builder. Generally speaking, it's more common to use the UITextField delegate methods.
• Optionally, you could have enforced input validation for the temperatures.
• The best keyboard to use is the decimal keyboard. The only downside is there is no negative key.

[andyrhee]

Thanks for your feedback!

Indeed, I was looking for the "most recently edited" textfield, but got stuck. I know I should have asked in the discussion board, but I was getting a bit late for that...

Can you please give me a couple of pointers on how to track which textfield was the most recently edited, and how to use the UITextField delegate methods?

The input validation is a good idea which I have thought about adding it, but was running against time.

Yes, the missing negative key was the reason why I abandoned the decimal keyboard because you can not use the PC keyboard to input negative number with real devices. Or, is there any easy way out?

P.S. I think you mentioned something about grades/scores for homework. Are we ever going to see any of them before the end? Or, is this some sort of opt-in policy?

[timothy1ee]

When an UITextField is being edited, the isEditing property is YES. Or, when the user begins editing in a textfield, you can store the active textfield in a property like activeTextField.

Many UI elements like UITextField, UITableView, UIAlertView have events associated with them. For example, a user has begun editing, finished editing, changed text, etc.

See this video for an example of how to set and use the UITextField delegate: http://www.youtube.com/watch?v=c5SRKfGiHSg

See this discussion about negative numbers: https://canvas.instructure.com/courses/832436/discussion_topics/1929300

I don't score the homework. If I leave feedback, it means that the submission is acceptable, unless I explicitly mention otherwise. Generally, as long as the user stories are technically satisfied, I'll accept the homework, although I'll leave tips for what I think a good implementation would have.