change a text by date

[hiddesteenbeek]

i have a question: i want to create an app that has a different text at the screen everyday by date. so for example:
on 5 july 2011: hi this is day 1
on 6 july 2011: hi this looks boring.
can someone please help me, thank you.

sorry for my english, i am dutch

[dany_dev]

you can retrieve the current date with

NSDate *today = [NSDate date];

now you can choose the right phrase from an array (depending on the number of the day or what you prefer)

[Duncan C]

Originally Posted by hiddesteenbeek

i have a question: i want to create an app that has a different text at the screen everyday by date. so for example:
on 5 july 2011: hi this is day 1
on 6 july 2011: hi this looks boring.
can someone please help me, thank you.

sorry for my english, i am dutch

You need to provide more information. Where would these strings come from? Would they be stored in a file somewhere? Do you want to pick them randomly, or do you want to display them in order from the beginning to the end of a list of messages?

How do you decide which is day 1? If you assign 5 July 2011 as day 1, and have 200 strings, what happens when you release your app to the store, 201 days later? At that point your app is out of strings.

Without knowing more about what you want to do, I can only point you at the system components that you need.

The NSCalendar class lets you calculate the difference between 2 dates in any units you want. If 5 July is your day 1, you could create an NSDate that represents 5 July, and then use the NSCalendar method components:fromDate:toDateptions: to calculate the number of days from your 5 July date to the current date. You could then use that day number as an index into a table of message strings, if that's what you wanted.

Take a look at the XCode documentation on that method. It includes sample code that shows how to calculate the number of months and days between 2 dates. It could be easily modified to calculate the number of days between 2 dates instead.

[hiddesteenbeek]

Originally Posted by Duncan C

You need to provide more information. Where would these strings come from? Would they be stored in a file somewhere? Do you want to pick them randomly, or do you want to display them in order from the beginning to the end of a list of messages?

How do you decide which is day 1? If you assign 5 July 2011 as day 1, and have 200 strings, what happens when you release your app to the store, 201 days later? At that point your app is out of strings.

Without knowing more about what you want to do, I can only point you at the system components that you need.

The NSCalendar class lets you calculate the difference between 2 dates in any units you want. If 5 July is your day 1, you could create an NSDate that represents 5 July, and then use the NSCalendar method components:fromDate:toDateptions: to calculate the number of days from your 5 July date to the current date. You could then use that day number as an index into a table of message strings, if that's what you wanted.

Take a look at the XCode documentation on that method. It includes sample code that shows how to calculate the number of months and days between 2 dates. It could be easily modified to calculate the number of days between 2 dates instead.

those string can be in a .txt file or something that actually doesn't matter.
there would be 260 strings and they would just come in a specific order and when it comes to string 260 it would start with string 1 again.

[Duncan C]

Originally Posted by hiddesteenbeek

those string can be in a .txt file or something that actually doesn't matter.
there would be 260 strings and they would just come in a specific order and when it comes to string 260 it would start with string 1 again.

Take a look at the components: fromDate: toDate: options: NSCalendar method I mentioned in my previous post. That would let you figure out the number of days that have elapsed since the first time the app was run. You would then use that index to index into your array of strings.

The tutorial in my signature for creating random, non-repeating text shows how to take a text file and split each line of the file into a separate entry in an array.

Those two things should let you do what you want.


Duncan

[hiddesteenbeek]

okay thank you very much.

[diva123]

for display message as per youur choice first you need to decide which date define what message.

for that you need to use the NSCalendar class as well as NSCalendar method. and define message as per your requiement.

After this you have one index as per your requirement and you can also use this index into your array string.........