A small game about ball collision in IOS

This game is about a ball moving randomly on the screen. You can use your fingers to manipulate a ball. If the two balls collide with each other, it means losing. A very simple game.

Define two UIImageView and one start button in StoryBoard

Link the two uiimageviews to the code.

@ Property (weak, nonatomic) IBOutlet UIImageView * player;

@ Property (weak, nonatomic) IBOutlet UIImageView * enemy;

@ Property (weak, nonatomic) IBOutlet UIButton * start;

Define the ball moving rate in ViewDidLoad

Pos = CGPointMake (5.0, 4.0 );

If you click start

-(IBAction) start :( id) sender {[self. start setHidden: YES]; // start a timer and let the player ball randomly move randomMain = [nst1_scheduledtimerwithtimeinterval: 0.03 target: self selector: @ selector (onTimer) userInfo: nil repeats: YES];}-(void) onTimer {[self checkCollision]; self. enemy. center = CGPointMake (self. enemy. center. x + pos. x, self. enemy. center. y + pos. y); if (self. enemy. center. *> 320 | self. enemy. center. x <0) {pos. x =-pos. x;} if (self. enemy. center. y> 480 | self. enemy. center. y <0) {pos. y =-pos. y ;}}- (void) checkCollision {// checks whether the two balls have collided with each other if (CGRectIntersectsRect (self. player. frame, self. enemy. frame) {[randomMain invalidate]; [self. start setHidden: NO]; CGRect frame = [self. player frame]; frame. origin. x = 137.0f; frame. origin. y = 326366f; [self. player setFrame: frame]; CGRect frame2 = [self. enemy frame]; frame2.origin. x = 137.0f; frame2.origin. y = 20366f; [self. enemy setFrame: frame2]; UIAlertView * alert = [[UIAlertView alloc] initWithTitle: @ "ball is catched" message: @ "you have to play again" delegate: self cancelButtonTitle: @ "cancel" otherButtonTitles: nil]; [alert show] ;}}

The code can be downloaded