Tag Archives: Objective-C

Example page showing how to set auto layout to arrange a username field, password field, login button and forgot credential buttons in swift programmatically.

By Arun CP | January 8, 2024

To set up auto layout for a username field, password field, login button, and forgot credential button programmatically in Swift, you can use the NSLayoutConstraint class to define the relationships between these UI elements. Here’s an example of how you can do this: This example creates and configures UITextField and UIButton instances, adds them to… Read More »

How to scroll a UIScrollView programatically ?

By admin | April 17, 2012

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Hi, If you want to scroll a UIScrollView programatically as the result of any IBOutlet actions, use the following code in that particular action. [yourScroller setContentOffset:CGPointMake(0,250) animated:YES]; This will scroll your scroller named ‘yourScroller’ automatically to the point specified! 🙂

How to get Device Orientation in Cocos2D, iPhone in Objective C?

By admin | April 17, 2012

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Hello all…… We may need to know that what is your current device orientation. Using the below code you can do this. Note: If you have to explicitly set the orientation of your phone to any of the above you can set this in the appDelegate.m file. You can put an “||” (OR) symbol in… Read More »

Sprite Animations Without Sprite Sheets

By James | April 7, 2012

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You can simulate any animations if you have a sequence of images which makes the illusion of that animations and rendering those images to the screen. In cocos2D it can be done in two ways, with sprite sheet animation and without sprite sheets. Here we are going to see how it can be done with… Read More »

Sprite Animations Without Sprite Sheets

By James | April 7, 2012

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Sprite Animations Without Sprite Sheets

By James | April 7, 2012

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Sprite Animations Without Sprite Sheets

By admin | April 7, 2012

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How to set UITableView background Image ?

By Malik | April 7, 2012

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Hi, Setting a background image to the UITableView will make it looks great! Use the following code to set a background image to a UITableView. Here ‘urTblView’ is your UITableView. 🙂

Building games for android and iPhone

By James | November 27, 2011

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Today I will talk about building games for android and iPhone. There are a lot of SDK’s available for building games over the internet and I am here to talk about the CORONA SDK. Corona SDK is a software development kit created by Walter Luh, co-founder of Ansca Mobile. It allows software programmers to build… Read More »

How to call a function after fixed time interval in Cocos2D ?

By Malik | July 28, 2011

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Hi, For calling a function after a definite time interval in Cocos2D, use the following code. this will call the function ‘yourFunction’ after 7 seconds. 🙂

How to add a custom font with size in a UITextView ?

By Malik | July 28, 2011

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Hi, For adding a custom font in a UITextView, use the following code. 🙂

How to Show Cocos2D Particle Effects Repeatedly ?

By Malik | July 28, 2011

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Hi, For showing particle effects repeatedly in Cocos2D, use the sample code. This will show the effect ‘yourEffect’ repeatedly in your game. 🙂

How to make a UITextField without border in iPhone ?

By Malik | June 23, 2011

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Hi, In order to make a UITextField with out or no border, do like this. In your .h class file, In your .m class file, Thus you will get a UITextField named urTextField without border. 🙂

iPhone NSData to NSString Conversion

By Malik | April 30, 2011

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Hi, Use the following line of code to convert NSData to NSString in iPhone/iPad using Objective C. Here ‘yourData’ is your NSData which you want to convert to NSString. 🙂

How to detect single/double/triple taps in iPhone ?

By Malik | April 30, 2011

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Hi, How can you detect single/double/triple taps in iPhone using Objective C? Use the following code to detect single or multiple taps in iPhone/iPad/iPod. The code can also be used with Cocos2D & Box2D. Try it out! You can even detect Quadrup! 🙂

How to find distance between two CGPoint in Cocos2D ?

By Malik | April 16, 2011

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Hi, Sometimes you may need to find the distance between two CGPoint in cocos2D or box2D using Objective C. See the following code to see how you could do that. 🙂

How to detect shake in iPhone ? An example

By Malik | April 13, 2011

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Hi, Sometimes you may want to detect shake gesture in iPhone using your programs. But how can you detect shake gesture in iPhone? Shake gesture in iPhone can be detected by using the accelerometer. The following lines of code can be used for detecting the shake gesture in iPhone. You can use these lines of… Read More »

How to remove box2D body from world ?

By Malik | April 10, 2011

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Hi, If you are a game developer and you are using box2D for real world simulations, you would probably need a particular body to be removed from the box2D world! But how can you remove box2D body from world ? See the following sample code which does the same. – (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {… Read More »

Email id verification using Objective C

By admin | March 29, 2011

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Hi, In order to verify an email address you have entered is valid or not using Objective C, use the following code. – (BOOL) checkYourMail: (NSString *) myEmail{ NSString *checkMail= @”[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}”; NSPredicate *matchMail = [NSPredicate predicateWithFormat:@”Matching %@”, checkMail]; return [matchMail evaluateWithObject:myEmail]; } 🙂

How to make a sprite visible and invisible in Cocos2D ?

By admin | March 27, 2011

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Hi, In certain situations you may need to make visible or invisible certain sprites. But how to set a sprite visible and invisible in Cocos2D? See the following Cocos2D code. //Set the sprite’s visible value to 1 to make it visible yourSprite.visible = 1; //Set the sprite’s visible value to 0 to make it invisible… Read More »

How to change the Z value of a Sprite during an action in Cocos2D ?

By admin | March 27, 2011

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Hi, There may arise some situations where you need to change the z value of a particular sprite during an action in Cocos2D. So how can you do that? See the following lines of code. CCSprite *sample= [CCSprite spriteWithFile:@”trialImage.png”]; sample.position = ccp(160,240); [self addChild:sample z:1]; /* Some of your actions goes here! */ [self reorderChild:sample… Read More »

How to create an action when a UITextField is clicked ?

By admin | March 26, 2011

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Hi, Want to invoke an action when a text field (UITextField) is clicked using Objective C? Use the following. [myTextField addTarget:self action:@selector(textFieldTouched:) forControlEvents:UIControlEventTouchDown]; – (void) textFieldTouched:(id)sender { //Here goes your actions on TextField Clicked } 🙂

Creating a Button using Objective C

By admin | March 26, 2011

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Hi, Sometimes you may need to create some buttons to the View using Objective C code rather than using Interface Builder. Here is how you can do that easily and efficiently. //You can create button with type. Here I am creating a Custom Button UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom]; //Then what? Give action to be… Read More »

Splitting a string using symbols in Objective C

By admin | March 20, 2011

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Hi, If you want to split a string between a symbol like, ‘.’ or ‘-‘ or ‘,’ in Objective C, what to do? See the code for how to split string in Objective C. NSString *myString = @”song.mp3”; NSArray *splitArray = [myString componentsSeparatedByString:@”.”]; This code will split the string ‘myString’ into ‘song’ & ‘mp3’ (separated… Read More »

How to stop the sprite sheet animation in cocos2D ?

By admin | March 17, 2011

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Hi, In one of our previous post we have discussed how to animate sprite sheet in cocos2D. In some cases you may need to stop the sprite sheet animation abruptly. How to do that? Here the way to do that. Use the following. [spriteName stopAction:spriteNameAction]; where spriteName is the name of your sprite & spriteNameAction… Read More »