how can i create a countdown timer using a datepicker selector? - datepicker

i have a question for you. i'm trying to create a countdown timer in Xcode 5 using the datepicker in "count down timer" mode. i tried several times but it still doesn't work. probably i miss something in my code. can you help me? thanks!!

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How to add time to Bloc timer exemple

I am beginner on flutter with bloc, do you know the easiest way to add time on the timer in example https://bloclibrary.dev/#/fluttertimertutorial ?
Add time while timer is running
Thanks you :)

How do i record stopwatch times in flutter

I would like to know how i can get the ending stopwatch time string once i have stopped the timer. I'm using this repo to make my stopwatch. Once i have stopped the timer i want the timer that is displayed to be put in a list so that i can record my times on a page like this:Times page. Would it use the If/else function?
Thanks Hunter

make a reset button for count down timer in swift

Hi this is a sample code and there is no reset button in there and I have problem with make a reset button for this count down timer
Source Link
If you're new in Swift I advise you this Repository
https://github.com/soapyigu/Swift-30-Projects/tree/master/Project%2002%20-%20Stopwatch
There you have a simple Stopwatch (and 29 more simple Apps) with a intelligible source Code.

Swift 3: UIButton re-enables after midnight

I have a button which disables after it is pressed. I need To work out how to get the button re-enable after midnight, or the next day.
So I think I need the button to set the date in a variable after it is pressed. Then an if statement which enables the button if the variable does not match today's date.
Would that be the best way to handle it? Can anyone offer any rough code advice, or possibly advice of an easier way to handle enabling a button after midnight?
Thanks
Then an if statement which enables the button if the variable does not match today's date.
But the question is, an if statement where? Your code can only run if something makes it run. If your app is just sitting there, midnight can come and go and your button won't be enabled because the code that looks to see if it's a different day from the day you saved is not running.
The solution:
Register to be notified by the system when the day changes.
Woow finally some nice question... it's definitely possible... you can check this beautiful documentation by apple:
https://developer.apple.com/library/content/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html
Basically you have 2 or more solutions, just 2 comes to my mind right now:
1.) Use UserDefaults or CoreData (Userdefaults for one property is more acceptable I guess
2.) Run backgroundTask as mentioned above..
The first one is very basic solution... you get the date when the button was tapped and if the day is equal to the day you entered the screen later, you keep the button disabled, else you unlock the button and store again the date into the user defaults, this seems to me a little piggy if you ask me..
The second one is much more elegant, in a nutshell... You setup button with some actions and the last thing is disabling it. Then, you setup background Task that every next day the button becomes enabled again...
I am pretty sure you will find the codes somewhere else here, maybe you will find the first algorithm more useful for you..
Anyway wish you best luck and happy coding! :)

UIDatePicker hours interval (NSCalendarUnit?)

I'm trying to make a UIDatePicker which allows the selection of hours only between 6.00 and 17.00. The other hours shall be inactive but still visible.
I think it can be done with setting up the picker calendar and then use this:
- (NSRange)maximumRangeOfUnit:(NSCalendarUnit)unit
but I'm not sure how.
Maybe someone can help me.
Thank you!
Sorry, but UIDatePicker doesn't support setting valid time ranges like you describe. The only options are minimum and maximum dates.
You'll either need to build a custom control from scratch or try to subclass UIDatePicker, but that's not a path I'd recommend.