{"id":233,"date":"2014-02-05T16:09:44","date_gmt":"2014-02-05T15:09:44","guid":{"rendered":"http:\/\/www.albertopasca.it\/whiletrue\/?p=233"},"modified":"2018-05-25T14:02:11","modified_gmt":"2018-05-25T12:02:11","slug":"how-to-make-flappy-bird-like-game-using-uikit","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/how-to-make-flappy-bird-like-game-using-uikit\/","title":{"rendered":"[Objc] How to make Flappy Bird like game using UIKit"},"content":{"rendered":"

As explained in the last post, (\u00a0How to make Flappy Bird like game using Cocos2D<\/a>\u00a0) today, we learn how to make a Flappy Bird game using Objectivec SKSpriteKit for iOS7 in 20 rows of code!<\/p>\n

<\/p>\n

What you need?<\/h4>\n

XCode and iOS 7 SDK.
\nOpen XCode, make new project and select SpriteKit Game for iOS or OSX, it\u2019s equal.
\n\"Screenshot<\/p>\n

Prepare game graphics<\/h5>\n

~ background
\n\"MarioBackground-static\"<\/a>
\n~ scrollable floor
\n\"MarioBackground-scrolling\"<\/a>
\n~ scrollable sky
\n\"MarioBackground-scrolling-top\"<\/a>
\n~ the player
\n\"Bird@2x\"<\/a>
\n~ the pipes (up \/ down)
\n\"PipeBottom@2x\"<\/a>
\n\"PipeTop@2x\"<\/a><\/p>\n

Making main menu scene<\/h4>\n

In your new file, MyScene.m, edit initWithSize method adding some SKSpriteNode, as the background image, the fish, and a SKLabelNode, that is the title.<\/p>\n

Very easy to draw:<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/\/ add the backgound
\nSKSpriteNode\u00a0*background\u00a0=\u00a0[SKSpriteNode spriteNodeWithImageNamed:@"MarioBackground-static"];
\n[background setPosition:CGPointMake(self.frame.size.width\/2, self.frame.size.height\/2\u00a0–\u00a012)];
\n[self addChild:background];\/\/ add the title label<\/p>\n

SKLabelNode\u00a0*titleLabel\u00a0=\u00a0[[SKLabelNode alloc]\u00a0initWithFontNamed:@"Helvetica"];
\n[titleLabel setPosition:CGPointMake(self.size.width\/2, self.size.height-150)];
\n[titleLabel setText:@"Touch to start"];
\n[self titleLabel];<\/p>\n

\/\/ add the player prite
\nSKSpriteNode\u00a0*player\u00a0=\u00a0[SKSpriteNode spriteNodeWithImageNamed:@"Bird"];
\n[player setPosition:CGPointMake(self.size.width\/2, self.size.height\/2)];
\n[self addChild:player];[\/code]<\/p>\n

You should see something like this:
\n\"Screenshot<\/a><\/p>\n

Making game scene<\/h4>\n

Make a new file, MyWorld.m of type Sprite.
\nNext in MyScene.h in touchesBegan method, replace contents with<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(void)touchesBegan:(NSSet\u00a0*)touches withEvent:(UIEvent\u00a0*)event
\n{
\n \/\/ choose you animation
\n SKTransition\u00a0*transition\u00a0=\u00a0[SKTransition doorsCloseHorizontalWithDuration:.4];\/\/ present new scene
\n MyWorld\u00a0*main\u00a0=\u00a0[[MyWorld alloc]\u00a0initWithSize:self.size];
\n [self.scene.view presentScene:main transition:transition];
\n}[\/code]<\/p>\n

Now, in your new file, draw the layer like the main menu, as you want in the initWithSize method.
\nBefore drawing the elements, you need to apply the gravity on your world<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/\/ customize your gravity here
\n[self.physicsWorld setGravity:CGVectorMake(0,\u00a0-10)];\/\/ detect collision enabled
\n[self.physicsWorld setContactDelegate:self];[\/code]<\/p>\n

For this project I\u2019ve used an extension of SKSpriteNode, called PBParallaxScrolling. You can find it on github.
\nIt\u2019s an extension used to easily make parallax scrolling. Download and add.<\/p>\n

PBParallaxScrolling is used for example to scroll sky:<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]PBParallaxScrolling\u00a0*\u00a0parallax\u00a0=\u00a0[[PBParallaxScrolling alloc]
\n initWithBackgrounds:@[@"MarioBackground-scrolling-top"]
\n size:CGSizeMake(320, self.frame.size.height)\u00a0direction:kPBParallaxBackgroundDirectionLeft
\n fastestSpeed:1.0
\n andSpeedDecrease:kPBParallaxBackgroundDefaultSpeedDifferential];<\/p>\n

_parallaxBackgroundSky\u00a0=\u00a0parallax;
\n[self addChild:parallax];[\/code]<\/p>\n

or to scroll background:<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]PBParallaxScrolling\u00a0*\u00a0parallax\u00a0=\u00a0[[PBParallaxScrolling alloc]
\n initWithBackgrounds:@[@"MarioBackground-scrolling"]
\n size:CGSizeMake(320, self.view.frame.size.height\u00a0+\u00a070)\u00a0direction:kPBParallaxBackgroundDirectionLeft
\n fastestSpeed:2.1
\n andSpeedDecrease:kPBParallaxBackgroundDefaultSpeedDifferential];<\/p>\n

_parallaxBackground\u00a0=\u00a0parallax;
\n[self addChild:parallax];\/\/ 1<\/p>\n

_parallaxBackground.physicsBody\u00a0=\u00a0[SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(320,\u00a05)];
\n[_parallaxBackground.physicsBody setAffectedByGravity:NO];
\n[_parallaxBackground.physicsBody setDynamic:NO];
\n[_parallaxBackground.physicsBody setCategoryBitMask:0x3\u00a0];
\n[_parallaxBackground.physicsBody setCollisionBitMask:\u00a00x1];[\/code]<\/p>\n

the background layer, recognize collision and gravity.
\n1) we created the body to don\u2019t fall outside screen and to bounce on the floor.<\/p>\n

Also the player should recognize gravity and collision.<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/\/ APSpritePlayer is a SKSpriteNode class, empty.
\n_player\u00a0=\u00a0[APSpritePlayer spriteNodeWithImageNamed:@"Bird"];
\n[_player setPosition:CGPointMake(self.size.width\/2, self.size.height\/2)];
\n[self addChild:_player];_player.physicsBody\u00a0=\u00a0[SKPhysicsBody bodyWithRectangleOfSize:_player.size];
\n[_player.physicsBody setDensity:kDensity];
\n[_player.physicsBody setAllowsRotation:NO];
\n[_player.physicsBody setCategoryBitMask:0x1\u00a0];
\n\/\/ bitmask for collision groups
\n[_player.physicsBody setContactTestBitMask:0x2 | 0x3];
\n[_player.physicsBody setCollisionBitMask:0x3 | 0x2];[\/code]<\/p>\n

If it\u2019s all correct, you should see your fish that fall down on the screen and stop on the floor. Parallax backgrounds and sky are currently not updated.<\/p>\n

\"Senza<\/a><\/p>\n

Make thing moving!<\/h5>\n

Add or edit, touchBegan and update methods to play with animations.<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/\/ jump on touch
\n–\u00a0(void)touchesBegan:(NSSet\u00a0*)touches withEvent:(UIEvent\u00a0*)event
\n{
\n \/\/ make fish jump
\n [_player.physicsBody setVelocity:CGVectorMake(_player.physicsBody.velocity.dx,\u00a0400)];
\n}<\/p>\n

\/\/ update loop method
\n–\u00a0(void)update:(NSTimeInterval)currentTime
\n{
\n \/\/ scroll parallaxes
\n [_parallaxBackground \u00a0 \u00a0update:currentTime];
\n [_parallaxBackgroundSky update:currentTime];if\u00a0(_player.physicsBody.velocity.dy &gt;\u00a0400)\u00a0{
\n [_player.physicsBody setVelocity:CGVectorMake(_player.physicsBody.velocity.dx,\u00a0400)];
\n}<\/p>\n

\/\/ rotate player on jump \/ fall down
\nCGFloat rotation\u00a0=\u00a0((_player.physicsBody.velocity.dy\u00a0+\u00a0400)\u00a0\/\u00a0(2*400))\u00a0*\u00a0M_2_PI;
\n[_player setZRotation:rotation-M_1_PI\/2];[\/code]<\/p>\n

Well done, now you\u2019re able to jump!<\/p>\n

\"Senza<\/a><\/p>\n

Add and count score<\/h5>\n

You\u2019re should be able to draw a label. Add a label on top-center of screen with text @\u201d0\u2033.<\/p>\n

In your initWithSize method, after all drawing, add a schedule, to update score.<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”][\u00a0NSTimer\u00a0scheduledTimerWithTimeInterval:1.5\u00a0target:self selector:@selector(startScoreTimer)\u00a0userInfo:nil\u00a0repeats:YES\u00a0];[\/code]<\/p>\n

This call every 1.5 seconds, startScoreTimer method and make a +1 on the score label.
\nSave 1.5 value! This must be the same time of the pipes creation interval!<\/p>\n

Add the random pipes<\/h5>\n

First draw the pipes yourself!
\nPipes are SKSpriteNode objects. Place it on screen in a fixed distance one with one.
\nMake drawing in a method that you next schedule with\u00a01.5<\/strong>\u00a0seconds of interval and drawing continuously.<\/p>\n

Every pipe should detect collision, of course!
\nLike the ground, we need to set to the pipe the physical body and gravity.<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]pipeTop.physicsBody\u00a0=\u00a0[SKPhysicsBody bodyWithRectangleOfSize:pipeTop.size];
\n[pipeTop.physicsBody setAffectedByGravity:NO];
\n[pipeTop.physicsBody setDynamic:NO];
\n[pipeTop.physicsBody setCategoryBitMask:\u00a00x2];
\n[pipeTop.physicsBody setCollisionBitMask:0x1];[\/code]<\/p>\n

Do the same things for the pipeDown that you will make.<\/p>\n

Move pipes:<\/p>\n

To make a continuous horizontal scolling, we use SKAction repeating forever the loop.<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]\/ Move top pipe
\nSKAction\u00a0*pipeTopAction\u00a0=\u00a0[SKAction moveToX:-(pipeTop.size.width\/2)\u00a0duration:1.5];
\nSKAction\u00a0*pipeTopSequence\u00a0=\u00a0[SKAction sequence:@[pipeTopAction,\u00a0[SKAction runBlock:^{
\n [pipeTop removeFromParent];
\n}]]];
\n[pipeTop runAction:[SKAction repeatActionForever:pipeTopSequence]];[\/code]<\/p>\n

\"Senza<\/a><\/p>\n

Collision detection<\/h5>\n

At the beginning we setted physics world collision delegate.
\nThis make didBeginContact being called on collision.<\/p>\n

And now we add this method!<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(void)didBeginContact:(SKPhysicsContact\u00a0*)contact
\n{
\n SKNode\u00a0*node\u00a0=\u00a0contact.bodyA.node;\/\/ boom!
\n if\u00a0([node isKindOfClass:[APSpritePlayer class]])
\n {
\n SKTransition\u00a0*transition\u00a0=\u00a0[SKTransition doorsCloseHorizontalWithDuration:.4];\/\/ go back to main menu
\n APMainMenu\u00a0*newGame\u00a0=\u00a0[[APMainMenu alloc]\u00a0initWithSize:self.size];
\n [self.scene.view presentScene:newGame transition:transition];
\n }
\n}[\/code]<\/p>\n

Now you\u2019re able to detect collision, jump, move pipes, count score, move background and move sky!
\nThat\u2019s all.<\/p>\n

As usual, it\u2019s a starting point, and you can\u00a0download here<\/a>.
\nYou can also improve, edit and make money using\u00a0github version<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

As explained in the last post, (\u00a0How to make Flappy Bird like game using Cocos2D\u00a0) today, we learn how to make a Flappy Bird game using Objectivec SKSpriteKit for iOS7 in 20 rows of code!<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[41,91,92,89,21,87,93,94,90],"class_list":["post-233","post","type-post","status-publish","format-standard","hentry","category-generic","tag-animation","tag-clone","tag-flappy","tag-flappy-bird","tag-game","tag-ios","tag-skspritekit","tag-skspritenode","tag-uikit"],"yoast_head":"\n[Objc] How to make Flappy Bird like game using UIKit - 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