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 »
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 »
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 } 🙂
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 »
For showing a number of animations sequentially in Cocos2D we use the CCSequence. CCSequence can accept a number of actions as parameters which will be executed in sequence , ie one after another. Here is a sample code to so this. /* This action will scale my_sprite */ id scaleTo = [CCScaleTo actionWithDuration:4 scale:1.5]; /*This… Read More »
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 »
Hi, Sometimes you may need to empty an array completely. How to do it? Use the following lines of code for it. [yourArray removeAllObjects]; here yourArray is the name of your array! 🙂
Hi, If you want to make tableView transparent with only texts visible, use the following code tableView.backgroundColor = [UIColor clearColor];
Hi, If you want to retrieve the data a user typed in on a Cocoa Mac application, follow the following steps. 1. You first need to declare a NSTextField variable in .h file @interface SampleAppDelegate : NSObject { NSTextField *myText; } @property (retain) IBOutlet NSTextField *myText; 2. Then you need to synthesize it for properties… Read More »
Hi, You all know how to add an Image to a sprite. But what if we need to change the image of the same sprite? How to do that? Use the following line of code to change the image of a sprite which already initialized with a sprite. [sampleSprite setTexture:[[CCTextureCache sharedTextureCache] addImage:@”newImage.png”]]; where sampleSprite is… Read More »
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 »
Hi, On many occasions you may need to use a popup button & in cocoa mac you can use NSPopUpButton objects for the same. While using a pop up button we need to identify the name of the item selected from the pop up list. But how is that done? You can use the following… Read More »
Hi, Suppose you have a sprite sheet of the desired animation you want. But how will you use that sprite sheet animation in your program using cocos2D? That’s simple. See the following code first. //Initializing a CCSpriteBatchNode with our sprite sheet image CCSpriteBatchNode *newSpriteSheet = [CCSpriteBatchNode batchNodeWithFile:@”jumpingOver.png”]; //Adding the spriteSheet to the layer & setting… Read More »
Hi, Sometimes you need to add Image to a UIImageView from the URL of the image you got. In that case, this is how you can add image to the UIImageView. NSString *picURL= @”http://photobucket.com/yourImage.gif”; NSData *picData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:mapURL]]; UIImage* picture = [[UIImage alloc] initWithData:picData]; [pictureView setImage:picture]; [picData release]; [picture release]; Here, pictureView is… Read More »
Hi, While using Box2D , in many cases you may need to connect two bodies together. But the collision between them during motion is not what you preferred! So how can you prevent those bodies being connected in Box2D from collision? Use the line of code to prevent the collision. jointDef.collideConnected = false;
Hi, Suppose you want to copy a sprite image to another new sprite while using cocos2D. What you do? See the following code… Let oldSprite be your first sprite CCSprite *oldSprite = [CCSprite spriteWithFile:@”ImgOne.png”]; And newSprite be your second sprite CCSprite *newSprite = [CCSprite spriteWithTexture:[oldSprite texture]]; That’s it! Done! Now newSprite too contain ImgOne as… Read More »
Yet another animation api from cocos2D, check it out…… id move = [CCMoveTo actionWithDuration:1 position:ccp(200,250); CCEaseElasticIn *elasticIn = [CCEaseElasticIn actionWithAction:move period:2.0]; [my_sprite runAction:elasticIn ];
There are different ways for playing sound on the Mac in Objective C. Let’s look at some of the methods.. 1. Play by filename. NSSound *mySound = [NSSound soundNamed:@”sound”]; if you have no file named “sound” in your application’s main bundle, then it will return nil. 2. Play by pathName sound = [[NSSound alloc] initWithContentsOfFile:@”/Volumes/Audio/sound.aiff”… Read More »
This code snippet deletes a substring from a original string.. /** initialize two strings **/ NSString *string = @”This is heaven”; NSString *part = @”heaven”; /** Get the range of the substring in the original string **/ NSRange range = [string rangeOfString:part]; /** Delete the substring from the original string **/ [string deleteCharactersInRange:range]; Please leave… Read More »
Often we see alerts with text message or title in it. But actually we can customize alerts. We can place any views inside it. We can place a textView(TextField) , imageView etc in it. Take a look at this simple example that places a textbox inside an alertView. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Title goes… Read More »
This simple code plays a music…….. [[SimpleAudioEngine sharedEngine] playBackgroundMusic:@”my_music.mp3″]; For stopping the music use this……. [[SimpleAudioEngine sharedEngine]stopBackgroundMusic]; To pause the music use this line of code….. [[SimpleAudioEngine sharedEngine] pauseBackgroundMusic];
Gear joints are one of the real specialities of Box2D. By creating gear joints between two bodies you can actually simulate a real world gear. For creating a gear joint you need two bodies connected by a revolute or prismatic joint. The below code creates two bodies in the shape of a circle which is… Read More »
Hi, Objective C uses a special keyword ‘id’. Let’s see what it is. Objective C -id- is actually a ‘pointer to an object’. That is ‘id’ can hold a pointer to any objective c object. It doesn’t matter the object’s class. eg: NSString *myString = @”Coderz Heaven!”; id newString; NSString *tempString; newString=myString; tempString=newString; That’s it!… Read More »
Plist or property list are usually used for storing data in iPhone. They are normal XML files, you can open it in a texteditor to view it’s data. This sample code shows how to read data from the plist. Reading a plist will return an array.You can print out the array to view the results.… Read More »
Hi all …… You know iPhone doesnot have garbage collection like ANDROID. So it becomes the responsibility of the developer or programmer to release the resources and remove the unwanted textures from your memory. If you don’t remove the unused textures and other variables from your memory your application will exit after a while. You… Read More »