Save and Add integer value in UserDefaults and retrieve after adding the value

Question

I can save and retrieve deleted mails number (such as like Integer value) in UserDefaults. Suppose if I deleted some more mails then I have to add/increase that saved UserDefaults value and if I retrieve it should come total deleted mails number. ->> Here numEmails is deleted mails number(Integer).

UserDefaults.standard.set(numEmails, forKey: "NumberofMailsDeleted") //Saving
var numMailsDeleted = UserDefaults.standard.integer(forKey: "NumberofMailsDeleted") //Retriving
print("I've deleted \(numMailsDeleted) mails") //Printing`

I will explain this scenario with other example ->> I want to save vehicles incoming (number of vehicles inside) into the parking area (i.e. the UserDefaults saved value is changing according to the cars incoming). If I retrieve it should come updated value of incoming don't think about outgoing, I don't need outgoing

What will be the issue in that you are saving and retrieving without any issue right? — Ganesh Manickam
– Ganesh Manickam, Commented Nov 30, 2017 at 12:01
hi @GaneshManickam, i can save one value but how i can add/increase it's value if i delete more mails after some time. — user8769899
– user8769899, Commented Nov 30, 2017 at 12:07

Indra Mohan · Accepted Answer · 2017-11-30 12:13:16Z

2

You can use the set(Int, forKey: String) method of UserDefaults:

//Get
let deletedMailsCount = UserDefaults.standard.integer(forKey: "NumberofMailsDeleted")
//Update deletedMails count
deletedMailsCount += 1;
//Set
UserDefaults.standard.set(deletedMailsCount, forKey: "NumberofMailsDeleted")
UserDefaults.standard.synchronize()

edited Nov 30, 2017 at 12:13

answered Nov 30, 2017 at 12:01

Indra Mohan

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2 Comments

user8769899 Over a year ago

Indra Mohan thanks, it's constantly increaring to 1 but i want to get everytime value from numEmails varaiable.

Indra Mohan Over a year ago

I added that code just for your understanding. Remove that part and put your own logic to calculate the deleted emails.

Vimal · Accepted Answer · 2017-12-01 10:52:48Z

1

var deletedEmail: Int { get { return UserDefaults.standard.integer(forKey: "emailsDeleted") } set { UserDefaults.standard.set( newValue forKey:"emailsDeleted")} }

Using computed property you can simplify it to something like this. newValue is a keyword you can use inside set property. Do not declare newValue !!. Just try the code and let me know.

answered Dec 1, 2017 at 10:52

Vimal

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