Using Notifications (Swift in Xcode) Video Lecture | Swift in Xcode: The Complete iOS Development Guide - App Development

hey everybody today I'm going to be
showing you how to use notifications
inside of your application with Swift
and Xcode so let's go ahead and get
started alright so this is what we're
trying to accomplish when I click on
this button right here a notification
pops up saying you one click go to
continue and then when I exit out of the
application then we're also going to
have a pop notification pop-up after a
certain amount of time so in the and
then this will also have the ability to
close where it just stays on the home
screen or you can go to the application
so let's go ahead and get started let's
open up Xcode and create a new Xcode
project and this Xcode project will be a
single View application although this
will apply to many other applications
our product name I'm just going to call
mine notifications and our language will
be set to swift and our devices will be
set to iPhone although this will work
universally and iPad click next and
create now I'm just gonna make this a
bit bigger and we need to go into our
main dot storyboard first we want to add
our a button into the middle of the
scene and this button will actually be
used to call a notification when you're
inside of this application say you you
lose a game or someone like that you
want this F you want this when you click
this button you want an alert to show or
something like that
it this is just a general idea you can
use this in any circumstance that you
want I'm just going to Center this by
just right clicking our control clicking
and dragging from our button and
centering it horizontally and vertically
and now that will be it
so let's go over to actually first let's
open up our attributes inspector just up
here in the top right corner right-click
or control clicking drag from that
button over to our viewcontroller.swift
file and we're going to make this and
sorry right-click or control click and
drag from our button again and we're
gonna make this connection and action
for the name of this action we're just
going to call this push notification so
we're just gonna push a notification on
to the screen and that will do for that
button let's close our assistant editor
and we're gonna go to our view
controller dot Swift file all right now
we're actually going to create this
alert view so first of all we need to
say variable you will just call this
alert view : are actually equals UI
alert controller so UI alert controller
so this is what actually controls what
we're going to do with this alert view
that is popping up so just say open
quotation mark and inside of that you
will you want this title message
preferred style so in the title we're
just going to say u1 so this is like the
the biggest title that's on there and
then the message will say something like
press press go to continue like so and
the preferred style will be UI alert
controller style dot alert now if we
built and ran this right now first of
all nothing would happen so we need to
add this onto our view controller itself
so we just say self dot present view
controller so we're presenting this
alert controller that we just created
so now inside of this first part we say
alert alert view where this alert view
that we just created right up here and I
made it will say sure or true it's going
to be animated and then for our
completion we don't want anything to
happen so we're just gonna say nil and
then right after this you will first
thing if you built and ran this right
now you will see that there's no cancel
button there's nothing here you click on
this button right now it says u1 press
go to continue but there's no go button
so let's fix that so down here you want
to say alert
vo dot add
action add action and this will be a UI
alert action action open bracket I mean
open parenthesis and inside of that you
will see title style handler so inside
of the tile will just say the title of
this will be go well what will the style
be it'll just be a normal style so just
say UI alert action style dot default
handler no we won't have anything
different with our handler now go down
here and let's I mean go up right here
and let's build and run our project and
now if we click on our button it will
have u1 press go to continue and then
you click go and it just goes back
straight to your application so that's
how you would add a notification onto
your button now let's go ahead and add a
notification that pops up in the
background say if your timer is done on
clash of plans
so when clash of clans is done that
specifically sends a notification saying
your city is built or someone like that
never really played the game myself but
that's how it works I believe and now in
sight so in order for this to be done we
need to go into our app delegate dot
Swift and we need to add the following
code you need to say application dot
register user notification settings user
notification settings inside of this you
want to say UI user notification
settings like so and then open open
parenthesis I mean open ya open
parenthesis for types and this type of
this this is the type of notification
mobile we want a notification of sound
we want a notification of an alert and
we want a banner so in order to do this
you just say
you I user notification type dot alert
and then you do a straight line up and
that just right above your turn P so
just say shift and it's the slash key
and it should give you that straight
line that you see right there so UI user
notification type dealer to and then we
will have UI user notification type dot
badge and then lastly UI user
notification type dot sound so we're
going to have either an alert a badge or
a sound that plays when a notification
goes off our categories will just say
nil as we don't have any categories that
we want to put this in so let's go over
to our view controller dot Swift and we
want to create our notification so in
order to do this let's actually create a
new function which is going to hold our
notification so we can call it later on
using timers and other things so just
say func this will be a notification
yeah we'll just call a notification
function and then hoping open
parentheses close parentheses open curly
bracket enter close curly bracket and
and now let's build this notification so
let's say var no to notification equals
UI local notification this is a local
notification meaning that it's not being
called from the web a notification is
not coming from the web it's coming
straight from your device so devouring
notification equals UI notice
notification open parentheses close
parentheses now inside of this you want
to say notification dot alert action now
this alert action is actually what what
do you want to do you want to go back to
the application or you want to cancel so
the cancel is automatically there by D
fault but the alert action you have to
add yourself so so notification dot
alert action equals open parentheses
close parentheses
coat each mark close quotation mark
sorry and this is going to be saying go
back to a Blick are able to see go back
to app and then after that you want to
say notification dot alert body so this
is actually what's going to be it's sort
of the message of the notification so we
can easily just say build your fortress
even though this isn't a game but
whatever build your fortress and then
down here you want to say notification
dot actually we don't want to enter a
launch image we will do that another day
so now we want to say UI application dot
shared application dot schedule local
notification and then open parentheses
close parentheses and inside of those
parentheses you want to put in this
notification that you just created right
there so we're just going to type in
notification so it's going to call this
notification outside of the application
itself so now go down here and we can
say notification and I forgot to add
something and also be sure anything that
you're adding on to this notification be
sure it's right it's always before this
part right here or else it will not work
properly so now you say notification dot
fire date so this is the fire date
meaning that after 10 seconds or
something this is going to fire so let's
say notification that fire date equals n
s date date open parenthesis and this is
going to be time interval since now and
we're going to actually make it now zero
now this would actually be different if
you were going to do
something else do a different type of
application such as a timer application
but notification about fire date time
interval since now zero is going to be
perfect for what we are going to do
we're gonna create this timer all by
ourselves this is this just seems to be
a lot easier to me so we can easily just
do this by saying variable timer equals
NS timer open parenthesis I'm sorry NS
timer dot scheduled timer with time
interval and this is going to be the one
with target selector and user info so
our time interval is just going to be
one second so every second this is going
to move our variable down by one our
target we will just say is the self that
our self because we're affecting the app
itself our selector we need to type in a
capital s selector capital S selector
and then open parentheses close
parentheses open quotation mark close
quotation mark inside of that and this
is going to be the name of our function
right here so just copy and paste that
right into there or you can type it out
if you want our user info we're going
we're not taking any user info and
repeats true it is going to repeat now
go down go up here and we want to create
a variable of time so we're going to
save bar time equals 10 so after 10
seconds or so basically every second
this is going to subtract one second
from this time and then it's going to
call this notification right here and we
can do this by just simply saying inside
of our function for notification time
minus minus equals 1 so every time this
function is called which is every 1
second it's going to subtract one from
our time
now go down here and you say if open
parentheses close parentheses time time
is equal equal because equal equal is a
comparison statement so actually you
want something more along the lines of
if it's lesser than or equal to zero so
once it hits zero or one time hits zero
then we want this notification to be
called so after that you want to say
open curly braket and then after this
after the UI application you want to
have the closed quotation close curly
bracket and now if we built and ran this
right now you will see that let's go
home so command shift H and you will see
in about far far five more seconds it'll
show our notification and there you have
it build your fortress you can click on
that and actually one there's another
thing that could be done oh there that's
a sort of a big problem it just keeps
calling it over and over again so this
should actually just be equal to equal
equal to zero sorry about that and also
we would want to say inside of this time
is equal to equal to zero timer dot
invalidate sorry we created this timer
up here so let's go up here and we're
going to create this timer outside of it
so let's say you just go right up here
and we're gonna save our timer equals NS
timer open parentheses close parentheses
and go up here and we want go into our
view tadhana take off the bar of that
function that we have right there and
now we can call this from inside of this
function that we have down here and we
can easily just say timer dot in the
validate now this invalidates our timer
so it's no longer counting down and
giving us more and more notifications as
we're going along because that would be
bad so now say time and now we can
actually move
this back to if it's lesser than or
equal to zero now let's build and run
this and let's go home real quick and
now we should get our banner
notification that's pretty soon all
right there we have it there is our
notification and as you can see that is
the only notification so that is good
sign and also if you're not getting
application getting any notifications go
into your settings go down here to your
notifications application that we just
created go over here to your
notifications and make sure allow
notifications is on and then also you
can change the style of applet of alert
notifications that are involved now this
is totally up to the user so the user
can change whether they want banners or
alerts so let's say I want alerts so now
if we were to go back command shift H
and build and run this application again
wait a tenth wait 10 seconds we should
actually get an alert notification onto
our scene more like so now that we have
it we have our alert notification that
says close or go back to app and to make
sure go click on book go back to app and
it works so that is how you work with
notifications with Swift and Xcode I
hope you guys found this in joyful and
also before I go out I am just going to
give a shout out to these websites that
helped me out the code ninja he only has
a few tutorials on his archive but the
go check him out one deals with the
exact same problem that I'm just showing
you today but it's all in text form so
notifications in iOS 8 part 1 and part 2
so they're all really nice tutorials but
you should post more I just must say
that anyway that's it I hope you guys
enjoyed it and I will see you in the
next one that's it for this tutorial if
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will see you in the next one