[Intro to iOS] Pre-work - Review my app

[hoaknoppix]

/cc @chug2k
My app is complete, please review and give me some comments. :)
Thanks.

[chug2k]

Thanks for your submission! You've satisfied the basic requirements, but you could make some improvements.

For your loadTipPercentage, I think your problem is that you never call saveTipPercentage. You should call it in viewWillDisappear, and loadTipPercentage should look something like:

        var defaults :NSUserDefaults = NSUserDefaults.standardUserDefaults()
        tipPercentage = defaults.floatForKey("tip_percentage")
        if tipPercentage == 0 {
            tipPercentage == 5.0
        }
        textBoxTipPercentage.text = "\(tipPercentage)"

Please try to fix your submission.

Thank you,
Charles

[hoaknoppix]

Thank Charles, It's so ridiculous for this mistake. However, I have tried like your suggestion and it doesn't work as well. The save method, it gets the correct new value, but when the app run again, it always gets the old value. :(

[chug2k]

I am a bad teacher. I gave you bad advice - sorry! My mistake.

viewWillDisappear is not called when the application quits, so instead of in viewWillDisappear, call your saveTipPercentage method when the you didFinishEditing on the tip field.

[hoaknoppix]

It works now Charles. Thank you so much! 👍
Btw, is it true that there is no event for application exiting in xCode? It should be like the android, I think.

[chug2k]

There actually is:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIApplicationDelegate_Protocol/index.html#//apple_ref/occ/intfm/UIApplicationDelegate/applicationWillResignActive
:

-Charles

On Wed, Aug 12, 2015 at 9:27 AM hoaknoppix [email protected] wrote:

It works now Charles. Thank you so much! [image: 👍]
Btw, is it true that there is no event for application exiting in xCode?
It should be like the android, I think.

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[chug2k]

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Thanks,
Sáng