落在地面的字符
我使用sprite工具包作为基本游戏的一部分。 游戏是有一个人，根据你点击的位置，移动到那个位置。 目前，玩家不受重力的影响（为了可玩性），但我试图实现引力。 但是，当我真的把重心转移到玩家身上时，我的angular色就会陷入困境。 我已经创build了一个地面节点，并禁用了地面物理（ground.physicsBody.dynamic = NO），但angular色仍然飞行通过。 我正在使用内置的精灵套件重力function，如果物理被禁用，理论上angular色应该停在地面。 我不知道为什么问题仍然存在，并希望在这个问题上得到一些帮助。
MyScene.m文件中的代码：
// // MyScene.m // DodgeMan // // Created by Cormac Chester on 3/8/14. // Copyright (c) 2014 Testman Industries. All rights reserved. // #import "MyScene.h" #import "EndGameScene.h" static const uint32_t redBallCategory = 0x1 << 0; static const uint32_t playerCategory = 0x1 << 1; @implementation MyScene -(id)initWithSize:(CGSize)size { if (self = [super initWithSize:size]) { //Sets up data storage self.storeData = [NSUserDefaults standardUserDefaults]; //Sets gravity self.physicsWorld.gravity = CGVectorMake(0,-2); self.physicsWorld.contactDelegate = self; //Set Background self.backgroundColor = [SKColor colorWithRed:0.53 green:0.81 blue:0.92 alpha:1.0]; //Set Ground SKSpriteNode *ground = [SKSpriteNode spriteNodeWithImageNamed:@"ground"]; ground.position = CGPointMake(CGRectGetMidX(self.frame), 34); ground.xScale = 0.5; ground.yScale = 0.5; ground.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:ground.size]; ground.physicsBody.dynamic = NO; ground.physicsBody.collisionBitMask = 1; ground.physicsBody.usesPreciseCollisionDetection = YES; //Player self.posX = 50; self.posY = 88; self.playerSprite = [SKSpriteNode spriteNodeWithImageNamed:@"character"]; self.playerSprite.position = CGPointMake(self.posX, self.posY); //Set Player Physics self.playerSprite.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.playerSprite.size]; self.playerSprite.physicsBody.dynamic = NO; self.playerSprite.physicsBody.categoryBitMask = playerCategory; self.playerSprite.physicsBody.contactTestBitMask = redBallCategory; self.playerSprite.physicsBody.collisionBitMask = 0; self.playerSprite.physicsBody.usesPreciseCollisionDetection = YES; //Score Label self.scoreLabel = [SKLabelNode labelNodeWithFontNamed:@"Arial-BoldMT"]; self.scoreLabel.text = @"0"; self.scoreLabel.fontSize = 40; self.scoreLabel.fontColor = [SKColor blackColor]; self.scoreLabel.position = CGPointMake(50, 260); //Pause Button self.pauseButton = [SKSpriteNode spriteNodeWithImageNamed:@"pauseButton"]; self.pauseButton.position = CGPointMake(self.frame.size.width / 2, self.frame.size.height - 40); self.pauseButton.name = @"pauseButton"; //Pause Label NSString *pauseMessage; pauseMessage = @"Game Paused"; self.pauseLabel = [SKLabelNode labelNodeWithFontNamed:@"Arial-BoldMT"]; self.pauseLabel.text = pauseMessage; self.pauseLabel.fontSize = 40; self.pauseLabel.fontColor = [SKColor blackColor]; self.pauseLabel.position = CGPointMake(self.size.width/2, self.size.height/2); //Set score self.score = 0; //Add nodes [self addChild:ground]; [self addChild:self.playerSprite]; [self addChild:self.scoreLabel]; [self addChild:self.pauseButton]; } return self; } //Add Red Ball -(void)addBall { SKSpriteNode *redBall = [SKSpriteNode spriteNodeWithImageNamed:@"locationIndicator"]; int minY = redBall.size.height / 2; int maxY = self.frame.size.height - redBall.size.height / 2; int rangeY = maxY - minY; int actualY = (arc4random() % rangeY) + minY; //Initiates red ball offscreen if (actualY >= 75) { //Prevents balls from spawning in the ground redBall.position = CGPointMake(self.frame.size.width + redBall.size.width/2, actualY); [self addChild:redBall]; } redBall.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:redBall.size.width/2]; redBall.physicsBody.dynamic = YES; redBall.physicsBody.categoryBitMask = redBallCategory; redBall.physicsBody.contactTestBitMask = playerCategory; redBall.physicsBody.collisionBitMask = 0; redBall.physicsBody.affectedByGravity = NO; redBall.physicsBody.usesPreciseCollisionDetection = YES; //Determine speed of red ball int minDuration = 3.0; int maxDuration = 5.0; int rangeDuration = maxDuration - minDuration; int actualDuration = (arc4random() % rangeDuration) + minDuration; // Create the actions SKAction *actionMove = [SKAction moveTo:CGPointMake(-redBall.size.width/2, actualY) duration:actualDuration]; SKAction *actionMoveDone = [SKAction removeFromParent]; SKAction *ballCross = [SKAction runBlock:^{ self.score++; self.scoreString = [NSString stringWithFormat:@"%i", self.score]; self.scoreLabel.text = self.scoreString; NSLog(@"Score was incremented. Score is now %d", self.score); }]; [redBall runAction:[SKAction sequence:@[actionMove, ballCross, actionMoveDone]]]; } - (void)pauseScene { self.paused = YES; [self addChild:self.pauseLabel]; } - (void)updateWithTimeSinceLastUpdate:(CFTimeInterval)timeSinceLast { self.lastSpawnTimeInterval += timeSinceLast; if (self.lastSpawnTimeInterval > 0.35) { self.lastSpawnTimeInterval = 0; [self addBall]; } } //Update Loop -(void)update:(CFTimeInterval)currentTime { /* Called before each frame is rendered */ // Handle time delta. CFTimeInterval timeSinceLast = currentTime - self.lastUpdateTimeInterval; self.lastUpdateTimeInterval = currentTime; if (timeSinceLast > 1) { //More than a second since last update timeSinceLast = 1.0 / 120.0; self.lastUpdateTimeInterval = currentTime; } [self updateWithTimeSinceLastUpdate:timeSinceLast]; } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { /* Called when a touch begins */ [super touchesBegan:touches withEvent:event]; //Starts Timer startTime = [NSDate date]; } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { /* Called when a touch ends */ [super touchesEnded:touches withEvent:event]; NSTimeInterval elapsedTime = [startTime timeIntervalSinceNow]; NSString *elapsedTimeString = [NSString stringWithFormat:@"Elapsed time: %f", elapsedTime]; NSLog(@"%@", elapsedTimeString); for (UITouch *touch in touches) { //Gets location of touch CGPoint location = [touch locationInNode:self]; NSLog(@"Touch Location X: %f \n Touch Location Y: %f", location.x, location.y); SKNode *node = [self nodeAtPoint:location]; //Runs when pause button is pressed if ([node.name isEqualToString:@"pauseButton"]) { NSLog(@"Pause button pressed"); if (!self.paused) { [self pauseScene]; } else if (self.paused) { self.paused = NO; [self.pauseLabel removeFromParent]; } } else { //Prevents destination from being in the ground if (location.y < 88) { location.y = 88; } //Moves and animates player int velocity = 1000.0/1.0; NSLog(@"Velocity: %i", velocity); float realMoveDuration = self.size.width / velocity; SKAction *actionMove = [SKAction moveTo:location duration:realMoveDuration]; [self.playerSprite runAction:[SKAction sequence:@[actionMove]]]; } } NSLog(@"Touch ended"); } //Collision between ball and player - player dies - (void)redBall:(SKSpriteNode *)redBall didCollideWithPlayer:(SKSpriteNode *)playerSprite { NSLog(@"Player died"); [redBall removeFromParent]; [playerSprite removeFromParent]; //Stores Final score [self.storeData setObject:self.scoreString forKey:@"scoreStringKey"]; SKTransition *reveal = [SKTransition fadeWithDuration:0.5]; SKScene *endGameScene = [[EndGameScene alloc] initWithSize:self.size]; [self.view presentScene:endGameScene transition: reveal]; } - (void)didBeginContact:(SKPhysicsContact *)contact { SKPhysicsBody *firstBody, *secondBody; if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) { firstBody = contact.bodyA; secondBody = contact.bodyB; } else { firstBody = contact.bodyB; secondBody = contact.bodyA; } //Red ball collides with the player if ((firstBody.categoryBitMask & redBallCategory) != 0 && (secondBody.categoryBitMask & playerCategory) != 0) { [self redBall:(SKSpriteNode *) firstBody.node didCollideWithPlayer:(SKSpriteNode *) secondBody.node]; NSLog(@"Player and ball collided"); } } @end 我会说你的问题是由于这一行
self.playerSprite.physicsBody.collisionBitMask = 0;
而不是将其设置为发生碰撞的类别
self.playerSprite.physicsBody.collisionBitMask = redBallCategory;
你需要定义与angular色相关的视图边界。 类似下面的视图边界声明那么这个字符被定义和限制在边界。 以下是示例代码：
- (void)confineToBounds { CGPoint correctedMonkeyPos = _monkey.position; CGPoint lowerLeft = CGPointZero; CGPoint upperRight = CGPointMake(self.size.width, self.size.height); if(correctedMonkeyPos.x <= lowerLeft.x) {correctedMonkeyPos.x = lowerLeft.x;} if(correctedMonkeyPos.x >= upperRight.x) {correctedMonkeyPos.x = upperRight.x;} if(correctedMonkeyPos.y <= lowerLeft.y) {correctedMonkeyPos.y = lowerLeft.y;} if(correctedMonkeyPos.y >= upperRight.y) {correctedMonkeyPos.y = upperRight.y;} _monkey.position = correctedMonkeyPos; }