App Development Exam > App Development Videos > Swift in Xcode: The Complete iOS Development Guide > Using a Slider to Control Audio (Swift in Xcode)
Using a Slider to Control Audio (Swift in Xcode) Video Lecture | Swift in Xcode: The Complete iOS Development Guide - App Development
FAQs on Using a Slider to Control Audio (Swift in Xcode) Video Lecture - Swift in Xcode: The Complete iOS Development Guide - App Development
| 1. How do I use a slider to control audio in my Swift app? |  |
Ans. To use a slider to control audio in your Swift app, you can follow these steps:
1. Drag and drop a UISlider onto your view controller's storyboard.
2. Create an IBAction function that will be triggered when the value of the slider changes.
3. Inside the IBAction function, use the value of the slider to control the volume or playback position of the audio.
4. Connect the IBAction function to the Value Changed event of the slider in the storyboard.
5. Test your app to ensure that the slider properly controls the audio based on its value.
| 2. How can I play audio in my Swift app? | |
Ans. To play audio in your Swift app, you can use the AVFoundation framework. Here are the steps to follow:
1. Import the AVFoundation framework into your view controller.
2. Create an AVAudioPlayer instance and initialize it with the audio file you want to play.
3. Set the necessary properties of the AVAudioPlayer, such as volume, number of loops, and playback position.
4. Call the `play()` method of the AVAudioPlayer to start playing the audio.
5. Optionally, you can implement delegate methods of AVAudioPlayer to handle events such as audio playback completion or interruptions.
| 3. How can I pause and resume audio playback using a slider in Swift? | |
Ans. To pause and resume audio playback using a slider in Swift, you can follow these steps:
1. Create a boolean variable to keep track of the playback state (paused or playing).
2. Inside the IBAction function of the slider, check the current value of the slider.
3. If the slider value is at the minimum, pause the audio playback by calling the `pause()` method of the AVAudioPlayer.
4. If the slider value is not at the minimum, resume the audio playback by calling the `play()` method of the AVAudioPlayer.
5. Update the playback state variable accordingly to reflect the current state of audio playback.
| 4. How can I sync the position of the slider with the playback position of the audio in Swift? | |
Ans. To sync the position of the slider with the playback position of the audio in Swift, you can follow these steps:
1. Inside the IBAction function of the slider, use the value of the slider to update the playback position of the AVAudioPlayer.
2. To update the playback position, set the `currentTime` property of the AVAudioPlayer to the value of the slider.
3. Additionally, you can implement the delegate method `audioPlayerDidFinishPlaying(_:successfully:)` of AVAudioPlayer to update the position of the slider when the audio playback completes.
4. In this delegate method, set the value of the slider to its minimum or maximum, depending on the desired behavior.
5. This ensures that the slider accurately represents the current playback position of the audio.
| 5. How can I implement a seek functionality using a slider to jump to a specific position in the audio in Swift? | |
Ans. To implement a seek functionality using a slider to jump to a specific position in the audio in Swift, follow these steps:
1. Inside the IBAction function of the slider, use the value of the slider to calculate the desired playback position in seconds.
2. Set the calculated playback position as the `currentTime` property of the AVAudioPlayer.
3. Additionally, you can update the UI elements, such as labels or progress bars, to reflect the new playback position.
4. To ensure smooth seeking, you can also implement the delegate method `audioPlayer(_:didFinishPlaying:successfully:)` of AVAudioPlayer and call the `play()` method after seeking to the desired position.
5. This allows the audio playback to continue seamlessly from the seeked position.
Text Transcript from Video
hey everybody today I'm going to be
showing you how to use a slider with
Swift in Xcode now the slider is
actually going to be used to manipulate
some audio that we use so let's go ahead
and get started this tutorial is
actually going to be a continuation of
my using audio with Swift in Xcode to
toriel so you guys can follow along that
tutorial or download the project files
from my website if you want so let's go
ahead and double click on audio Xcode
project and we're going over to our main
dot storyboard and we want to open up
our right editor right over here it
should just be right up there in the
right corner and we want to add in a
slider so just go ahead click and draw
click and drag your slider into your
view like so I'm going to actually put
that right in the center and I'm going
to make it a bit bigger so you can edit
a bit more finally inside of your
application
alright so now that that's done so let's
connect this slider that we just created
with our viewcontroller.swift file so
let's go ahead open up our assistant
editor and we want to right-click or
control click and drag from our slider
and we're going to make the connection
type in action I mean an outlet sorry
it's going to be an outlet because we
want to name this slider that we have
are creating so we're going to say the
name of this is slider
pretty clever name I know alright so now
let's go down here and we want to add a
function as well and this function is
going to be called anytime we want to
edit like scroll through the audio that
we are playing and by the way we are
playing the background audio so that
I'll show you the audio in just a minute
that we're trying to edit so let's open
up and we're going to right-click or
control click and drag from our slider
and this is going to be a connection
type of an action and the name of this
will just say change audio time change
audio time so it's going to change the
audio time that we are using so now if I
were to build and run this first of all
the slider would do
thing because we have nothing set up but
that right there is the audio that we
are trying to manipulate in this sense
and also just one more thing this is
more personal preference I'm going to
right-click or control click and drag
from our smize scroller from my slider
and say Center horizontally in container
and I'm going to Center it vertically
you don't need to do that I just like
doing it all right now first thing we
want to do inside of this function that
we created I'm going to close out of my
assistant editor so in this change audio
time function that we created we want to
say background audio dot play now if you
don't remember the background audio and
is right up here and it's an AV audio
player so this and this basically
harnesses all the commands that you
could do for a normal audio player so
you can say a background audio that play
then after that you can also say
background audio dot current time and
then we want to set the current time now
you think it would be like oh the
current time would equal slider value
because that's how it works out in my
head if you were going to the main dot
storyboard you click on your slider
right now it says the current value is
0.5 so by the way this value right here
is from 0 to 1 so this actually would
mean seconds 0 to 1 seconds that's how
long this slider is going we will change
that in just a minute but right now the
value that we are trying to grab is this
current value so the basic way to do
that is go to our viewcontroller.swift
and you would think that that would work
we're just grabbing the slider value or
the value at which this button right
here is placed up but that is wrong you
actually need to convert this value into
a time interval so you can say n
background audio current time equals NS
time interval
interval and then open open parentheses
and we're going to say slider dot sorry
slider slider dot value like so so now
we actually just converted this value
into an NS time interval and then now
this will actually change our background
audio and also this shouldn't be
background audio dot play this should be
background audio dot stop because we
want this audio to stop then we change
the time and then after that time is
changed we want it to play so we can say
background audio dot prepare to play and
then background audio play so now if we
were to do this you will notice that
it's actually going to work but but it
will only edit within that one second
you can actually hear them so it's only
starting it in that one second so let's
change that right now so go to our
viewdidload and we're going to say a
slider dot maximum value is equal to NS
time time interval and this is going to
be our background audio duration so
taking the duration of this and actually
this shouldn't be NS time interval this
should be a float value because a float
value is just a more complicated integer
value it can get really really deep into
how long it is so we needed to convert
this value the background audio duration
into a float value in order for this to
work go back to our view controller on
Swift and now if we were to actually
build and run this you will see that the
maximum value so this actually can
scroll all the way to the end now within
a one single line of code we just did
that so now we want this to update as
it's playing right now as you can see
nothing's really happening
as its playing it just standing still
but we can still edit at the time at
which it is at so let's change the value
of the slider as we are going through
our music so we can say funk so we're
going to create a function and this
function will hold basically what
changes what changes as we update the
value so we can say function audio or we
can say update update slider we'll just
call it that function update slider and
inside of this function or sorry update
slider open parentheses close
parentheses and inside of this function
we can easily just say slider keep
typing okay slider dot current I'm sorry
slider dot value it is equal to and we
can say background audio dot current
time and of course this needs to be
actually transferred into a float value
again or else this will not purple a so
now we're taking this slider value and
we're going to take this float and we're
going to go background audio current
time and also just to be sure that this
would be working just in case we get any
errors we can also just add an NS log to
be sure that this update slider is being
called so we'll just say NS log hi so
this will be called any time this
function is called now we're going to go
up here to our viewdidload and we're
going to create a timer so we can just
save our timer equals NS timer dot
scheduled timer with time interval and
you want this one that says a time
target selector and user info and
repeats so the time at which we want to
update this slider is 0.1 seconds now
you can get more refined and say 0.01
seconds or anything like that but I'm
going to stick at 0.1 sec
our target will be self our selector
we're just going to make the selector
right here and so just say selector with
a capital S and then open parentheses
close parentheses open quotation mark
close quote each mark inside of those
parentheses then we would just want to
take this name of the function and be
sure it's spelled properly be sure it's
everything works properly and then just
paste that right inside of our selector
that we have right there
user info we're not going to agree
grabbing any user info so you say no and
repeats true so it will repeat over and
over again now just reminder this target
self that just means it's calling the
target is going to be actually the
viewcontroller itself that's all that
means
now let's go ahead build and run and now
we should get this updating as we are
going through our audio now as you can
see it's updating we have our audio
playing and we can scrub through we can
pause it stop and that'll also reset
this time and then you click play again
and there you have it that's how you do
a slider I use it with audio using Swift
with Xcode so we hope you guys enjoyed
this tutorial and found it helpful
that's it for this tutorial if you
enjoyed it be sure to hit that like
button down below if you want to see
more tutorials like this for me in the
future be sure to subscribe down below
anyway that's it for this tutorial and I
will see you in the next one
everybody today I'm going to be showing
you how to use a slider to control your
media just effective
showing you how to use a slider with
Swift in Xcode now the slider is
actually going to be used to manipulate
some audio that we use so let's go ahead
and get started this tutorial is
actually going to be a continuation of
my using audio with Swift in Xcode to
toriel so you guys can follow along that
tutorial or download the project files
from my website if you want so let's go
ahead and double click on audio Xcode
project and we're going over to our main
dot storyboard and we want to open up
our right editor right over here it
should just be right up there in the
right corner and we want to add in a
slider so just go ahead click and draw
click and drag your slider into your
view like so I'm going to actually put
that right in the center and I'm going
to make it a bit bigger so you can edit
a bit more finally inside of your
application
alright so now that that's done so let's
connect this slider that we just created
with our viewcontroller.swift file so
let's go ahead open up our assistant
editor and we want to right-click or
control click and drag from our slider
and we're going to make the connection
type in action I mean an outlet sorry
it's going to be an outlet because we
want to name this slider that we have
are creating so we're going to say the
name of this is slider
pretty clever name I know alright so now
let's go down here and we want to add a
function as well and this function is
going to be called anytime we want to
edit like scroll through the audio that
we are playing and by the way we are
playing the background audio so that
I'll show you the audio in just a minute
that we're trying to edit so let's open
up and we're going to right-click or
control click and drag from our slider
and this is going to be a connection
type of an action and the name of this
will just say change audio time change
audio time so it's going to change the
audio time that we are using so now if I
were to build and run this first of all
the slider would do
thing because we have nothing set up but
that right there is the audio that we
are trying to manipulate in this sense
and also just one more thing this is
more personal preference I'm going to
right-click or control click and drag
from our smize scroller from my slider
and say Center horizontally in container
and I'm going to Center it vertically
you don't need to do that I just like
doing it all right now first thing we
want to do inside of this function that
we created I'm going to close out of my
assistant editor so in this change audio
time function that we created we want to
say background audio dot play now if you
don't remember the background audio and
is right up here and it's an AV audio
player so this and this basically
harnesses all the commands that you
could do for a normal audio player so
you can say a background audio that play
then after that you can also say
background audio dot current time and
then we want to set the current time now
you think it would be like oh the
current time would equal slider value
because that's how it works out in my
head if you were going to the main dot
storyboard you click on your slider
right now it says the current value is
0.5 so by the way this value right here
is from 0 to 1 so this actually would
mean seconds 0 to 1 seconds that's how
long this slider is going we will change
that in just a minute but right now the
value that we are trying to grab is this
current value so the basic way to do
that is go to our viewcontroller.swift
and you would think that that would work
we're just grabbing the slider value or
the value at which this button right
here is placed up but that is wrong you
actually need to convert this value into
a time interval so you can say n
background audio current time equals NS
time interval
interval and then open open parentheses
and we're going to say slider dot sorry
slider slider dot value like so so now
we actually just converted this value
into an NS time interval and then now
this will actually change our background
audio and also this shouldn't be
background audio dot play this should be
background audio dot stop because we
want this audio to stop then we change
the time and then after that time is
changed we want it to play so we can say
background audio dot prepare to play and
then background audio play so now if we
were to do this you will notice that
it's actually going to work but but it
will only edit within that one second
you can actually hear them so it's only
starting it in that one second so let's
change that right now so go to our
viewdidload and we're going to say a
slider dot maximum value is equal to NS
time time interval and this is going to
be our background audio duration so
taking the duration of this and actually
this shouldn't be NS time interval this
should be a float value because a float
value is just a more complicated integer
value it can get really really deep into
how long it is so we needed to convert
this value the background audio duration
into a float value in order for this to
work go back to our view controller on
Swift and now if we were to actually
build and run this you will see that the
maximum value so this actually can
scroll all the way to the end now within
a one single line of code we just did
that so now we want this to update as
it's playing right now as you can see
nothing's really happening
as its playing it just standing still
but we can still edit at the time at
which it is at so let's change the value
of the slider as we are going through
our music so we can say funk so we're
going to create a function and this
function will hold basically what
changes what changes as we update the
value so we can say function audio or we
can say update update slider we'll just
call it that function update slider and
inside of this function or sorry update
slider open parentheses close
parentheses and inside of this function
we can easily just say slider keep
typing okay slider dot current I'm sorry
slider dot value it is equal to and we
can say background audio dot current
time and of course this needs to be
actually transferred into a float value
again or else this will not purple a so
now we're taking this slider value and
we're going to take this float and we're
going to go background audio current
time and also just to be sure that this
would be working just in case we get any
errors we can also just add an NS log to
be sure that this update slider is being
called so we'll just say NS log hi so
this will be called any time this
function is called now we're going to go
up here to our viewdidload and we're
going to create a timer so we can just
save our timer equals NS timer dot
scheduled timer with time interval and
you want this one that says a time
target selector and user info and
repeats so the time at which we want to
update this slider is 0.1 seconds now
you can get more refined and say 0.01
seconds or anything like that but I'm
going to stick at 0.1 sec
our target will be self our selector
we're just going to make the selector
right here and so just say selector with
a capital S and then open parentheses
close parentheses open quotation mark
close quote each mark inside of those
parentheses then we would just want to
take this name of the function and be
sure it's spelled properly be sure it's
everything works properly and then just
paste that right inside of our selector
that we have right there
user info we're not going to agree
grabbing any user info so you say no and
repeats true so it will repeat over and
over again now just reminder this target
self that just means it's calling the
target is going to be actually the
viewcontroller itself that's all that
means
now let's go ahead build and run and now
we should get this updating as we are
going through our audio now as you can
see it's updating we have our audio
playing and we can scrub through we can
pause it stop and that'll also reset
this time and then you click play again
and there you have it that's how you do
a slider I use it with audio using Swift
with Xcode so we hope you guys enjoyed
this tutorial and found it helpful
that's it for this tutorial if you
enjoyed it be sure to hit that like
button down below if you want to see
more tutorials like this for me in the
future be sure to subscribe down below
anyway that's it for this tutorial and I
will see you in the next one
everybody today I'm going to be showing
you how to use a slider to control your
media just effective
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About this Video
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Nov 22, 2024 Last updated |
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