iPhone Programming Tutorial: Integrating Twitter Into Your iPhone Applications
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If you are a developer (which you most likely are if you are reading this) you probably have (or should have) a Twitter account. With Twitter getting so much attention lately, you would be crazy to not include some sort of Twitter integration into your own iPhone application.
There are many ways applications can be made more social by including Twitter. For example, you could make the application auto-tweet when you unlock a special item in a game, or beat it. This lets all of their friends know they are playing your game and in turn gets you more exposure. You could also use this as an idea for creating your own Twitter client (don’t just submit my tutorial to the app store).
Twitter has provided us with some very simple API’s to follow making it a snap to interface with them. I have started a series on my personal blog about creating a Twitter client for the Mac that we will be borrowing some code from.
One thing I want to note before starting is: I will be going rather quick through the tutorial when it comes to creating the interface and hooking up the IBOutlets. If you need extended help on that, this is probably not the tutorial you want to start on. Read some of my previous tutorials and come back.
This basic tutorial will just show you how to post a status update to your Twitter. I will also show you how to create an app that run entirely in landscape mode. So it’s a two-fer.
Let’s get started…
1. Create A View Based Application
Name it something awesome. I called mine TwitUpdate (not awesome, I know). The first thing we should do is create our IBOutets and IBActions. Now download the images for the tutorial and drag them into the Resources group inside of XCode.
2. Set up your IBoutlets and IBActions
So open TwitUpdateViewController.h. And let’s add the following code:
You can omit the UIButton outlets if you would like. I just like having them around in case we want to do anything with the button. This is pretty straight forward, we have a UITextView to enter our Twitter status in. And an IBAction that gets called to post our Twitter status. Don’t forget to synthesize these properties in TwitUpdateViewController.m or you will be smitten by the compiler. One other thing you will see here is a UIActionSheet. We will display this sheet as our “Loading” screen when posting a tweet.
3. Build The Interface
Go ahead and open up TwitUpdateViewController.xib.
So if you are wondering how to get Interface Builder in landscape mode, it’s actually quite simple. It is not obvious however as it took me forever and a freakin day to figure it out. There is a little arrow (as in the screenshot below) in the top right corner of the view. Click it and the view will rotate to landscape mode.
Now that your interface is in landscape mode, remove the Status Bar. This is done by clicking on the view and setting the Status Bar drop down in the attributes inspector to none. This will just give you more screen real estate.
Now drag a UIImageView on your view and stretch it to fill the entire screen. Set the Image attribute of the UIImageView to be twit_background.png and bask in the glory of my beautifully created interface! Next, we need to add the UITextView.
Grab a UITextView and drag in on to the view and stretch it to fit just inside of the chat bubble. Make sure to delete the lorem ipsum text inside.
The last interface element we need to add is the update button. Drag a UIButton on to your view. In the button’s attributes, set it’s type to custom and it’s image to btn_update.png. Make sure you drag the button to fit the update image. Your final interface should look like this
Now, connect the twitterMessageText from File’s Owner to the UITextView and the updateButton to your custom button. Also, be sure to connect the TouchUpInside method of the UIButton to the postTweet IBAction. Here is a screenshot of what the connection properties should look like when you click on File’s owner.
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Now close Interface Builder.
4. Creating Our Twitter Request Class
So, we will interface with Twitter using an NSMutableURL request and NSURLConnection. You have two options at this juncture, you can either download the files below and add them to your project to use, or you can head on over to http://brandontreb.com/objective-c-programming-tutorial-creating-a-twitter-client-part-1/ and learn how to create them yourself (recommended route). I would explain it here, it’s just that I already wrote an in depth tutorial for it on my blog. This is now a tutorial scavenger hunt.
3.1 Note: As pointed out, by teresa and Ivan in the comments , to get it working in 3.1
just comment out the [newCredential release] in
In – (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
We were releasing this object too early and it was causing a crash
If you just want to complete this tutorial and move on, download the file above, unzip and drag the files into your project. We need to add some code to these files in order to post a status update to Twitter. So, open TwitterRequest.h and update the following code
We have added a Boolean that denotes whether or not we are making a HTTP POST request (Twitter uses both POST and GET). Also, there is a string that will represent the POST request. In our case, this will just get set to “status=foo” (foo being your status update).
Also, we have added a method signature to update your status. It takes an NSString which is just the status text. The other variables are explained in my tutorial on brandontreb.com. Now, open up TwitterRequest.m and add the following code.
Ok, beginning with the status_update method. This method looks very similar to our friends_timeline method with a few exceptions. First, we set isPost = YES. Next, we set the request body = “status=%@” where we set %@ to our status update.
Now, for some trickier code. In the request method of our class, we need to add some code to do an HTTP POST (rather than a GET). This is how we tell Twitter what to set our status to. So, the first thing is to set the HTTPMethod for the request to POST. Next, we have set the “Content-Type” field to let Twitter know what kind of data we are sending. Following that, the body of the request is sent. This is the actual data that Twitter will see. Finally, we just tell the request how large (in bytes) our data is going to be. If this is all foreign to you, I recommend you go read up on POST and GET.
Phew… Done with that. Now for the final part of implementing our postTweet method.
5. PostTweet Method
Open up TwitterUpdateViewController.m and add the following code.
Ok, not super complex as the TwitterRequest class does most of the heavy lifting. As a reminder, the postTweet method gets called when you press the Update button. The first thing we do here is build a new TwitterRequest object and set the username and password field. Make sure you put in YOUR twitter username and password. Next, we call the resignFirstResponder method on the UITextView. This is to hide the keyboard.
Just so the user knows something is happening, we display a simple action sheet that has no buttons and says “Posting to Twitter…” . Finally, we call the statuses_update method in our TwitterRequest class.
The Twitter request class will then do some magic and eventually call the callback method that you specified (status_updateCallback) and send it the data that Twitter returned to us. The first thing we do is dismiss the action sheet. Next, I am simply outputting the response from Twitter in to the terminal.
The response received from Twitter would need to be parsed and displayed or something but that’s for another tutorial.One thing to note, if you enter an invalid username or password, this app will just hang and say “Posting to Twitter” forever. You need to handle this in an error callback method. Again described in the tutorial in which we took the TwitterRequest code from.
6. Run The App In Landscape Mode
The last part of this tutorial is to force the app to run in landscape mode as well as hide the status bar. Open up TwitUpdate-Info.plist. Right click on the table and select “Add Row”. Select Initial interface orientation and set the value to Landscape (left or right). Right click again and add Status bar is initially hidden. to hide the status bar. It should now look like this.
We also need to update the TwitUpdateViewConroller.m file to respond to the interface rotations. Uncomment the following method in TwitUpdateViewController.m and change it to say:
Just tells the the view to rotate when the iphone is rotated…
Well, I hope you have enjoyed this tutorial. I hope to see some cool Twitter integration in all of your apps (feel free to comment and let me know how you have implemented it in your app). You can always ask questions in the comments of the post or write me on twitter. And for lazy people here is the source (j/k). Happy iCoding.
- Posted by brandontreb on 9 Jul 2009 in iPhone Programming Tutorials
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70 Responses
AppStoreMod Says:
July 9th, 2009 at 1:40 pm
Great Tutorial. Can you guys make a tutorial on how to make a twitter have customized background to each update. That would be awesome.
Picoman Says:
July 9th, 2009 at 2:50 pm
Another great tutorial, I thank you!
I can only spend an hour a day learning at the moment (until i lose my job on 31st July…) and you really help make the learning process fast and straightforward. Hopefully going to submit my first app in the second week of August. This site is a great resource. If you need any help with anything, just ask.
danno Says:
July 10th, 2009 at 9:10 pm
looking back on some of your other posts, all of the source code and screencast links are broken. might wanna take a look at that.
rockteady,
danno~
Gaurang Says:
July 13th, 2009 at 9:19 am
Hello
I am facing problem with invalid username and password ,it stucks with the UI actionsheet even if the username or password is incorrect .
Also it doesnot leave out in case of no network connection .
Please help me out I am facing this problem from 3 days .
I require only post method so this is the great tutorial for me thanks
mail me on gtechonly4u@gmail.com
Techy Says:
July 14th, 2009 at 8:23 am
I could not get mine to work correctly so I downloaded your example, ran it and got the following error:
CodeSign error: Code Signing Identity ‘iPhone Developer’ does not match any code-signing certificate in your keychain. Once added to the keychain, touch a file or clean the project to continue.
Do you know how I can fix this??
Brandon Says:
July 14th, 2009 at 9:55 am
@Techy,
You need to build for the simulator. You are getting this error because you are building for the device and don’t have the signing set up.
LiveCity Says:
July 14th, 2009 at 11:58 am
I have a rather lengthy question to ask you. Where/how do I do that?
Thanks,
D
Brandon Says:
July 14th, 2009 at 3:40 pm
@Techy
Click the dropdown on the top left corner of XCode (right now it should say something like “Device 2.2.1 | Debug”, click that and change to iPhone Simulator 2.2.1
@liveCity
Techy Says:
July 14th, 2009 at 4:58 pm
Thanks for all the help, after about 7 computer restarts and fixing that error it worked lol.. I have one last question, when you buy standard certificate or whatever that allows you to post on the app store, do you get lessons on how to program with the iphone sdk??
Apple iPhone Appstore Application Analytics - Mobclix Says:
July 15th, 2009 at 4:35 am
Thanks for sharing this all, it’s really useful for us,
Jeremy Says:
July 18th, 2009 at 1:08 pm
when i try to run it it just stays frozen at the posting to twitter action sheet. no prompt for username or password or anything. anybody know how to fix this?
Techy Says:
July 18th, 2009 at 9:04 pm
@Jeremy
You put your username/password into the code, look under section five: postTweet method, of this tutorial..
Good Luck!
Mayank Says:
July 20th, 2009 at 4:12 pm
Without a doubt a great tutorial
how can i integrate it with an app of mine
like if i want to add it to my app so that the user can key in his username and password and then send tweets etc
this wil work only for me i guess
thanks
Jeremy Says:
July 20th, 2009 at 11:37 pm
@Mayank
yeahh thats the kind of idea I was trying to get at. But i guess this only works for one person whos a dev??
Brandon Says:
July 21st, 2009 at 2:31 pm
@Mayank @Jeremy
It’s not hard at all. Just read through some of my other tutorials about creating new views, etc… and add another view in front of this one that prompts for a Twitter username and password.
Then, once the user enters these credentials save them with NSUserDefaults (again read my tutorial on this)
Jason Says:
July 22nd, 2009 at 10:24 pm
I am using the iPhone beta 3.1 beta 2 and when I click on the update button I get a error saying unable to read unknown load command 0×22 and I have no idea what that means. It works perfectly fine in simulator 3.0.
Can anyone help?
iPhone Programming Tutorial: Animating A Game Sprite | iCodeBlog Says:
July 24th, 2009 at 11:52 am
[...] Double click on whateveryoucalledyourapplicationViewController.xib to open it in Interface Builder. Click the arrow button on the view to rotate it. If you don’t what I am talking about, check out this post. [...]
Mike Says:
July 25th, 2009 at 7:05 am
I tried adding a new field to info.plist and the Initial interface orientation and Status bar is initially hidden options are not available from the dropdown. Any ideas/thoughts/suggestions.
Thanks in advance!
Mike
Caleb Says:
July 26th, 2009 at 1:27 am
Thanks for the tutorial. I am struggling to get the text to reset after being sent to Twitter. How would one go about this?
Brandon Says:
July 26th, 2009 at 9:55 am
@Mike – You have to manually type them. They are not in the default set.
@Caleb – Just do twitterMessageText.text = @”"; in the postTweet method
Ivan Says:
July 26th, 2009 at 11:00 am
Tried it on 3.0 and it works. On 3.1 Beta 2 it crashes when posting. Hope you can update the tutorial later on for 3.1. betas 
Geoff H Says:
July 27th, 2009 at 10:14 pm
Awesome tutorial, thanks much. I do have one question though – what about encoding the message to tweet? Certain characters cause problems – for example, entering “&” causes it and everything after to be cutoff. So far I cannot find the encoding members I’m looking for.
Jason Says:
July 28th, 2009 at 6:51 pm
I am trying to validate the username and password on a settings page i have and wanted to know the correct API call. I am using http://twitter.com/account/verify_credentials.xml but I don’t know the parameters it needs please help me.
Ivan Says:
August 8th, 2009 at 1:07 pm
Jason: “Unable to disassemble objc_msgSend.”
On beta3 simulator and on device.
Shabbir Says:
August 9th, 2009 at 12:07 pm
I am having the same problem as Ivan. I get EXC_BAD_ACCESS
I really hope this is just a problem with Apple, because I have an app in the app store using this code and it will not work on 3.1
brandon Says:
August 9th, 2009 at 1:13 pm
I’ll check this out this week and post the fix. Sorry about that, Apple must have changed something in 3.1
Ivan Says:
August 9th, 2009 at 2:09 pm
thanks brandon. really appreciate it. like Shabbir, I have an app which will be out in time for 3.1 and would like to be able to get this working by then.
let me know if you need help troubleshooting on 3.1 (you have my email me thinks)
Shabbir Says:
August 9th, 2009 at 2:25 pm
Thanks a lot Brandon! Your code helped me out a lot in my Application. “Face the Music” http://rfly.me/72 — check it out it’s free :]. Problem is the Twitter integration isn’t working on 3.1
and Ivan good luck with your application! Hope to see it in the App Store soon
iPhone Programming Tutorial: Integrating Twitter Into Your iPhone … | IPhoneMate Says:
August 12th, 2009 at 9:31 am
[...] See the rest here: iPhone Programming Tutorial: Integrating Twitter Into Your iPhone … [...]
teresa Says:
August 18th, 2009 at 9:20 am
@Ivan
In – (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
The exec_bad_access was in fact because [newCredential release]; was in the code, but the newCredential wasn’t being retained before.
I don’t know it didn’t happen on the original application, but when I copied the code to another application it happened and I had to debug the code using instruments.
Great tutorials!
thanks
Ivan Says:
August 19th, 2009 at 3:35 pm
@teresa
Just tested and it works. Thanks for that.
Shabbir and Jason, just comment out the [newCredential release] in
In – (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
Julian Says:
August 20th, 2009 at 12:59 pm
Great Tutorial, thanks!
I needed it this feature for my app and now it works fine!
Julian
antony Says:
August 25th, 2009 at 11:57 pm
Hi it is rally an excellent tutorial. it works for me. I am really thank full to you. I would like to know that is there any way to change the footer of the status message from “from the api” to “from my application”
sean Says:
August 28th, 2009 at 8:24 pm
The “Posted from [Your App]” part of the REST api (which is what this fine tutorial uses) was discontinued. Apps that USED to use that parameter can still use it. New apps must use the OAuth authentication method to get the custom “posted from” line. Which is more secure, better user control, etc, but tricky for something that’s not a webpage. More info here: http://apiwiki.twitter.com/Authentication
Franky Says:
September 1st, 2009 at 7:20 pm
@antony: This is no longer possible with basic http password authentication – Twitter now requires you to use OAuth protocol and register your app with them.
http://apiwiki.twitter.com/FAQ#HowdoIget“fromMyApp”appendedtoupdatessentfrommyAPIapplication
There is a framework named MPOAuthConnection that has a sample iphone cocoa application (MPOAuthMobile) but I haven’t been able to make POST work so far. If anyone has, please share…
http://code.google.com/p/mpoauthconnection/wiki/GettingStarted
Cheers
iPhone Programming Tutorial: Animating A Game Sprite | Iphone Study Blog Says:
September 4th, 2009 at 6:03 pm
[...] Double click on whateveryoucalledyourapplicationViewController.xib to open it in Interface Builder. Click the arrow button on the view to rotate it. If you don’t what I am talking about, check out this post. [...]
Mustafa Says:
September 8th, 2009 at 9:29 pm
Very nice post. Thanks for sharing. I would love to see a similar post for publishing information on Facebook!
Ram Says:
October 7th, 2009 at 8:01 pm
Has anyone found the fix for the problem where if the character “&” is used in the text, the message is truncated?
superbgx Says:
October 12th, 2009 at 2:47 am
Hi, great tutorial ! thanks for sharing with us.
If the user and pass don’t match the loading action sheet won’t close and you have to restart the app.You’ll need to add this before the NSLog(@”Invalid Username or Password”); line
UIAlertView *myAlert = [ [ UIAlertView alloc ]initWithTitle:@”twitter” message:@”Invalid Username or Password” delegate:self cancelButtonTitle: nil otherButtonTitles: @”OK”, nil];
[myAlert show];
[myAlert release];
[delegate performSelector:self.callback withObject:receivedData];
NSLog(@”Invalid Username or Password”);
Brandon Says:
October 12th, 2009 at 1:41 pm
I have updated the TwitterReqest class to include the fix for 3.x. It should no longer crash
Ram Says:
October 12th, 2009 at 8:17 pm
@Brandon, could you also check the problem where if the text contains the character “&”, then the message gets truncated?
Brandon Says:
October 13th, 2009 at 9:16 am
@Ram that is bc the text needs to be url encoded. I’ll add that to the tutorial.
Andrea Says:
October 13th, 2009 at 8:31 pm
I have a problem, please help me!
error: Cocoa/Cocoa.h: No such file or directory
when I remove #import from TwitterRequest.h then it says
“_NSlog”, referenced from:
-[PruebaViewController status_updateCallback:] in PruebaViewController.o
symbol(s) not found
collect2: ld returned 1 exit status
I don’t now what I’m doing wrong, I’ve done exactly what the tutorial said
Ram Says:
October 14th, 2009 at 9:12 pm
@Brandon – thx, i tried using [NSString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding] but it didn’t work. Maybe there’s another way to do it
kewl Says:
October 22nd, 2009 at 5:18 am
@Brandon
first of all thank you for posting twitter integration code to Iphone. It’s really helpful
I have just got a very quick question.
in addition to your code, I have created
- (void) isPostSuccess code which return the value of isSuccess.
What i’m trying to do is checking if the user name and password entered was correct. So I set isSuccess = NO in the below code
However, I’m having issue on finding where should I set isSuccess = YES ?
Your advise is greatly appreciated.
thank you
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
//NSLog(@”challenged %@”,[challenge proposedCredential] );
if ([challenge previousFailureCount] == 0) {
NSURLCredential *newCredential;
newCredential=[NSURLCredential credentialWithUser:[self username]
password:[self password]
persistence:NSURLCredentialPersistenceNone];
[[challenge sender] useCredential:newCredential
forAuthenticationChallenge:challenge];
//[newCredential release];
} else {
isSuccess = NO;
[[challenge sender] cancelAuthenticationChallenge:challenge];
[delegate performSelector:self.callback withObject:receivedData];
NSLog(@”Invalid Username or Password”);
}
}
Narender Says:
October 24th, 2009 at 6:52 am
Hi Brandon,
I saw one application around me, there first it is checking usrename and password and if it is okey than it allows user to enter text. how to do that ? here we are writing the text first and attempting it so post. so we have to pass the message than it will ask for username and password. can you please post something like asking username and password than checks the credentials, if correct than asks for message ?????
Gary Says:
November 17th, 2009 at 1:47 am
Im gettitng this error
2009-11-17 15:44:51.379 TweetApp[3212:20b] ispost
Current language: auto; currently objective-c
2009-11-17 15:44:53.443 TweetApp[3212:20b] Connection failed! Error – Operation could not be completed. (NSURLErrorDomain error -1012.) http://twitter.com/statuses/update.xml
2009-11-17 15:44:53.444 TweetApp[3212:20b] Invalid Username or Password
I already my correct user name and password.
Any Idea is greatly appreciated.
Tommy Myers Says:
November 27th, 2009 at 1:06 pm
i have this in the posttweet method:
TwitterRequest * t = [[TwitterRequest alloc] init];
t.username = [NSString stringWithFormat:@"%@", [usernamePlace text]];
t.password = [NSString stringWithFormat:@"%@", [passwordPlace text]];
[usernamePlace resignFirstResponder];
[passwordPlace resignFirstResponder];
loadingActionSheet = [[UIActionSheet alloc] initWithTitle:@”Posting To Twitter…” delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
[loadingActionSheet showInView:self.view];
NSString *myTweet = [[NSString alloc] initWithFormat:@”I took %i second/s to complete a level on the #DodgeIt! iPhone Game. Try and beat that! Get it on the App Store: http://bit.ly/6QnAhP“, mainInt];
[t statuses_update:myTweet delegate:self requestSelector:@selector(status_updateCallback:)];
[myTweet release];
so the user puts in their twitter info and then is posts a tweet already put into the app but when i hit the post button it shows the actionsheet but thwn it crashes.
anyone know how to solve this?
Tom Says:
November 29th, 2009 at 8:19 pm
How do I set it up for me to have a label for username and password in IB instead of having to type it in the code
Heru Says:
December 4th, 2009 at 3:31 am
hi, can i ask you something about chat. Can i use image emoticon for some special character like ? So, i can change every “:)” with smile icon… can you help me, please.
hardik Says:
December 5th, 2009 at 12:08 am
@Tommy Myers
I am Completely NEW to iphone integrating with Twitter
Thanks for the wonderful post.and also thanks to other people who have given their views.Mr.Tommy Myers I also need the same thing that you want.And I have also tried your code that u have post in this.And even I am facing the same thingDid you got the solution to this if yes please give to me also.
hardik Says:
December 5th, 2009 at 12:30 am
@Tommy Myers
Can You give me your complete code.
Thanks in advance.If possible for you mail me.
mail me at:hardikpatel1987.007@gmail.com
Keyur Says:
December 13th, 2009 at 1:20 pm
@Tommy Myers
Hey Tommy, I am facing the exact same issue that you are. Have you been able to find anything on this issue. My application crashes as well. Not sure what is going on.
Please help me out. Thank you so much. You can either post here or my email address is tech@kdp-tech.com
Thanks again,
Keyur Patel
rasta Says:
January 2nd, 2010 at 3:21 pm
The & problem
This is suppose to work:
NSString* escapedUrlString =
[unescapedString stringByAddingPercentEscapesUsingEncoding:
NSASCIIStringEncoding];
But doesnt… I think its an apple bug
This works everytime for all special characters!
MyTweetMsg = (NSMutableString *)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)TempMessage,NULL,(CFStringRef)@”!*’();:@&=+$,/?%#[]“,kCFStringEncodingUTF8);
maxfiresolutions Says:
January 5th, 2010 at 2:05 pm
Hi, can we send/post images also using this code? What changes will be required? Any idea? (Sorry for being dumb on this)
Matthew2229 Says:
January 16th, 2010 at 1:27 pm
@Brandon
I want to create a full on Twitter client for the iPhone, so
1.Where did you learn this?
2.Where should I get started?
Tran Wallen Says:
February 3rd, 2010 at 6:59 am
Hi thanks a lot for a perceptive post, I actually found your blog by mistake while looking on Goole for something else closely related, anyhow before i ramble on too much i would just like to state how much I enjoyed your post, I have bookmarked your site and also taken your RSS feed, Once Again thanks for the blog post keep up the good work.
Kevin Says:
February 6th, 2010 at 2:28 pm
Thanks for this awesome tutorial, it’s helped me out a ton! One thing that I’m trying to figure out though is how to use the other API’s, especially the GET kind. Your post says if I don’t understand it, I should read up on POST and GET. Do you have any recommendations?
Thanks.
Thomas Says:
February 8th, 2010 at 9:18 am
hi Brandon, I am testing the twitter tutorial and it works like a charm. it only seems to update my test message only once, although I always seem to get into the callback without errors.. When I check at the site it never adds the same msg 2 times, when I change the message every time it works perfect..
Am I missing something?
brandontreb Says:
February 8th, 2010 at 9:33 am
@Thomas – Twitter doesn’t allow duplicate posts. This is why you must change the message for it to work.
Thanks for reading!
Thomas Says:
February 8th, 2010 at 9:46 am
Thanks for writing it.. Coming from a strong Flash Lite background it’s not always easy to step into objective-c. I like your tutorials because they are also very syntax-driven. I understand most code/programming concepts, but the syntax is so new
Any way, i’m very happy with you sharing your knowlegde!
Greets from belgium
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