Set start Time with a DatePicker? about jwgcirclecounter

[johngraham262]

Hey I'm a little confused with your question. Can you clarify a bit more? startWithSeconds will start the timer that expires in the specified number of seconds.

Do you want to pass in an NSDate in the future, and then your circleCounter object will calculate how many seconds are remaining until that NSDate (and then also start the timer)?

[blackyE1]

Hi,

i want that the user can select the countdown time with a uidatepicker.

[johngraham262]

At the moment, you can only start a circleCounter if you know the number of seconds into the future for when the timer should expire.

But if I understand you correctly, you should be able to do something like this:
The UIDatePicker has an NSDate on it. You can call yourDatePickerObject.date to get it. Then compare the selected date to now to determine how many seconds into the future that is.

NSDate *selectedDate = yourDatePickerObject.date;
NSTimeInterval seconds = [selectedDate timeIntervalSinceNow]; //be careful of negative return values
[circleCounter startWithSeconds:(NSInteger)seconds];

[blackyE1]

Thank you,

now i have this error "Terminating app due to uncaught exception 'JWGInvalidTime', reason: 'circle counter timer length -542'.
The DatePicker is for picking hours and minutes, not for a date.

[johngraham262]

I recommend you read the docs. When you call timeIntervalSinceNow, it'll return a negative number if you passed in an NSDate that is before now. Check that the date you're passing in is later than now to get a positive number.

[johngraham262]

Any luck? I'll resolve for now, but reach out if you have more questions.