我正在开发一款即将完成的游戏，但我遇到了一个我自己无法解决的问题（老实说，有很多，但让我们把它留给其他问题）。
我的游戏是这样组织的：主菜单 --> 游戏场景 -->暂停/游戏结束暂停和游戏结束菜单基本上只是由精灵和标签节点组成的叠加层。
在游戏中，有一个玩家需要避免接触敌人，每x时间生成一次。我通过重复永远运行代码块的 SKAction 来实现这一点。
当游戏暂停（点击暂停按钮时），它会将布尔值（isPaused）更改为 YES，这会导致每个方法停止。它还消除了敌人生成操作。
当游戏重新启动时，它会删除当前存在的所有内容并重新创建整个场景。
问题是：每当我点击暂停按钮时，菜单就会出现，然后退出应用程序（只是后台实际上没有退出）并返回并按重新启动，敌人不会生成尔格，动作不会运行（节点计数也没有上升我检查过）。
下面是一些代码：
我不会把所有东西都放进去，所以如果你发现一些东西引用了不存在的东西，那个东西可能在原始代码中。
在GameScene.m中：
-(void)didMoveToView:(SKView *)view {
if (!self.contentCreated) {
[self createSceneContents];
self.contentCreated = YES;
}
}
-(void)createSceneContents {
self.isTouchingGround = NO;
self.isPaused = NO;
self.world = [SKNode node];
NSLog(@"likewhatever");
self.playerCategory = 1;
self.enemyCategory = 2;
self.edgeCategory = 4;
self.bottomCategory = 8;
self.playerScore = 0;
[GameDataHelper sharedGameData].score = 0;
self.physicsWorld.contactDelegate = self;
SKSpriteNode *bottom = [SKSpriteNode spriteNodeWithColor:[SKColor blackColor] size:CGSizeMake(self.frame.size.width, 10)];
bottom.position = CGPointMake(self.frame.size.width/2, 0);
bottom.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:bottom.size];
bottom.physicsBody.dynamic = NO;
bottom.physicsBody.restitution = 0;
bottom.physicsBody.categoryBitMask = self.bottomCategory;
bottom.physicsBody.contactTestBitMask = self.playerCategory | self.enemyCategory;
SKSpriteNode *left = [[SKSpriteNode alloc]init];
left.size = CGSizeMake(1, self.frame.size.height);
left.position = CGPointMake(0, self.frame.size.height/2);
left.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:left.size];
left.physicsBody.dynamic = NO;
left.physicsBody.restitution = 0;
SKSpriteNode *right = [[SKSpriteNode alloc]init];
right.size = CGSizeMake(1, self.frame.size.height);
right.position = CGPointMake(self.frame.size.width - 1, self.frame.size.height/2);
right.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:right.size];
right.physicsBody.dynamic = NO;
right.physicsBody.restitution = 0;
self.backgroundColor = [SKColor blackColor];
self.playerData = [[Player alloc]init];
self.customUnit = self.frame.size.width/7;
self.player = [self.playerData newPlayer:self.customUnit];
self.player.physicsBody.categoryBitMask = self.playerCategory;
self.player.physicsBody.contactTestBitMask = self.enemyCategory | self.edgeCategory | self.bottomCategory;
self.player.position = CGPointMake(CGRectGetMidX(self.frame), self.customUnit*5);
[self.playerData movementSetup];
[self createUI];
NSString *path = [NSString stringWithFormat:@"%@/gamemusic2.mp3", [[NSBundle mainBundle]resourcePath]];
NSURL *mainMusicURL = [NSURL fileURLWithPath:path];
self.mainMusicPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:mainMusicURL error:nil];
self.mainMusicPlayer.volume = 0.1;
self.mainMusicPlayer.numberOfLoops = -1;
[self.mainMusicPlayer play];
[self spawnObject];
[self addChild:self.world];
[self.world addChild:bottom];
[self.world addChild:self.player];
[self addChild:left];
[self addChild:right];
[self addChild:self.pause];
[self addChild:self.scoreLabelInGame];
[self addChild:self.actualScore];
}
-(void)createUI {
self.pause = [SKSpriteNode spriteNodeWithImageNamed:@"pausebutton.png"];
self.pause.size = CGSizeMake(self.customUnit,self.customUnit);
self.pause.name = @"pauseButton";
self.pause.position = CGPointMake(30, self.frame.size.height - 30);
self.pausedImage = [SKSpriteNode spriteNodeWithImageNamed:@"paused.png"];
self.pausedImage.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame)*1.5);
self.restart = [SKLabelNode labelNodeWithFontNamed:@"Futura"];
self.restart.text = @"RESTART";
self.restart.fontSize = 25;
self.restart.position = CGPointMake(CGRectGetMidX(self.frame), self.pausedImage.position.y - self.pausedImage.position.y/5);
self.resume = [SKLabelNode labelNodeWithFontNamed:@"Futura"];
self.resume.text = @"RESUME";
self.resume.fontSize = 25;
self.resume.position = CGPointMake(self.restart.position.x, self.restart.position.y - self.customUnit);
self.scoreLabelInGame = [SKLabelNode labelNodeWithFontNamed:@"Futura"];
self.scoreLabelInGame.text = @"";
self.scoreLabelInGame.fontSize = 25;
self.scoreLabelInGame.position = CGPointMake(self.frame.size.width - 100, self.frame.size.height - 40);
self.actualScore = [SKLabelNode labelNodeWithFontNamed:@"Futura"];
self.actualScore.text = @"SCORE: 0";
self.actualScore.fontSize = 25;
self.actualScore.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeRight;
self.actualScore.position = CGPointMake(self.frame.size.width - 20, self.frame.size.height - 40);
self.deathImage = [SKSpriteNode spriteNodeWithImageNamed:@"youdied.png"];
self.deathImage.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame)*1.5);
}
-(void)spawnObject {
NSLog(@"called");
if (self.isPaused == NO){
NSLog(@"notpaused");
self.spawningSpeed = 1.5;
self.enemyData = [[Enemy alloc]init];
SKAction *wait = [SKAction waitForDuration:self.spawningSpeed];
SKAction *run = [SKAction runBlock:^{
NSLog(@"spawned");
SKSpriteNode *aNewEnemy = [self.enemyData createEnemyWithSize:self.customUnit andWidth:self.frame.size.width andHeight:self.frame.size.height + self.player.position.y];
aNewEnemy.physicsBody.allowsRotation = NO;
aNewEnemy.physicsBody.categoryBitMask = self.enemyCategory;
aNewEnemy.physicsBody.collisionBitMask = self.enemyCategory | self.playerCategory | self.edgeCategory | self.bottomCategory;
aNewEnemy.physicsBody.contactTestBitMask = self.enemyCategory | self.playerCategory | self.edgeCategory | self.bottomCategory;
[self.world addChild:aNewEnemy];
}];
SKAction *action = [SKAction repeatActionForever:[SKAction sequence:@[wait,run]]];
[self runAction:action withKey:@"spawn"];
}
}
-(void)didBeginContact:(SKPhysicsContact *)contact {
if (self.isPaused == NO) {
SKPhysicsBody *firstBody, *secondBody;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) {
firstBody = contact.bodyA;
secondBody = contact.bodyB;
}else {
firstBody = contact.bodyB;
secondBody = contact.bodyA;
}
if (firstBody.categoryBitMask == self.playerCategory && secondBody.categoryBitMask == self.bottomCategory) {
self.isTouchingGround = YES;
}
if (firstBody.categoryBitMask == self.playerCategory && secondBody.categoryBitMask == self.enemyCategory) {
self.isTouchingGround = YES;
if ([secondBody.node.name isEqualToString:@"fallingEnemy"] && self.player.position.y < secondBody.node.position.y) {
[self gameOver];
}
}
if (firstBody.categoryBitMask == self.enemyCategory && secondBody.categoryBitMask == self.enemyCategory) {
[self.enemyData changeBlock:firstBody.node];
[self.enemyData changeBlock:secondBody.node];
[self impactSound];
[self updateScore];
NSLog(@"Change1");
}
if (firstBody.categoryBitMask == self.enemyCategory && secondBody.categoryBitMask == self.bottomCategory) {
NSLog(@"Change2");
[self.enemyData changeBlock:firstBody.node];
[self impactSound];
[self updateScore];
}
}
}
-(void)pauseGame {
NSLog(@"Pausing...");
[self removeActionForKey:@"spawn"];
[self addChild:self.pausedImage];
[self addChild:self.restart];
[self addChild:self.resume];
NSString *path = [NSString stringWithFormat:@"%@/menu_music.mp3", [[NSBundle mainBundle]resourcePath]];
NSURL *pauseMusicURL = [NSURL fileURLWithPath:path];
self.pauseMusicPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:pauseMusicURL error:nil];
self.pauseMusicPlayer.numberOfLoops = -1;
[self.pauseMusicPlayer play];
[self.pause removeFromParent];
self.scoreLabelInGame.position = CGPointMake(self.restart.position.x, self.resume.position.y - self.customUnit);
self.actualScore.position = CGPointMake(self.restart.position.x, self.scoreLabelInGame.position.y - self.customUnit);
self.isPaused = YES;
[self.mainMusicPlayer pause];
}
-(void)restartGame {
[self removeAllChildren];
[self removeAllActions];
self.isPaused = NO;
[self.pauseMusicPlayer stop];
[self createSceneContents];
}
-(void)resumeGame {
self.isPaused = NO;
[self.pauseMusicPlayer stop];
[self spawnObject];
self.scoreLabelInGame.position = CGPointMake(self.frame.size.width - 100, self.frame.size.height - 40);
self.actualScore.position = CGPointMake(self.frame.size.width - 20, self.frame.size.height - 40);
[self.mainMusicPlayer play];
[self.restart removeFromParent];
[self.resume removeFromParent];
[self.pausedImage removeFromParent];
[self addChild:self.pause];
}
-(void)gameOver {
NSLog(@"Game Over");
GameDataHelper *gameData = [[GameDataHelper alloc]init];
[self removeActionForKey:@"spawn"];
[self addChild:self.restart];
[self addChild:self.deathImage];
SKAction *gameOverSound = [SKAction playSoundFileNamed:@"gameover_tune.mp3" waitForCompletion:NO];
[self runAction:gameOverSound];
NSString *path = [NSString stringWithFormat:@"%@/menu_music.mp3", [[NSBundle mainBundle]resourcePath]];
NSURL *pauseMusicURL = [NSURL fileURLWithPath:path];
self.pauseMusicPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:pauseMusicURL error:nil];
self.pauseMusicPlayer.numberOfLoops = -1;
[self.pauseMusicPlayer play];
[self.pause removeFromParent];
SKLabelNode *highScore = [SKLabelNode labelNodeWithFontNamed:@"Futura"];
NSString *highScoreText = [NSString stringWithFormat:@"HIGHSCORE: %ld",[GameDataHelper sharedGameData].highScore];
highScore.text = highScoreText;
highScore.fontSize = 25;
highScore.position = CGPointMake(self.frame.size.width/2, self.restart.position.y - (2*self.customUnit));
[self addChild:highScore];
self.scoreLabelInGame.position = CGPointMake(self.restart.position.x, self.resume.position.y - self.customUnit);
self.actualScore.position = CGPointMake(self.restart.position.x, self.scoreLabelInGame.position.y - self.customUnit);
self.isPaused = YES;
[self.mainMusicPlayer pause];
[gameData save];
}
在敌人中：
-(SKSpriteNode *)createEnemyWithSize:(float)size andWidth:(float)width andHeight:(float)height {
self.enemy = [SKSpriteNode spriteNodeWithImageNamed:@"block.png"];
self.enemy.size = CGSizeMake(size - 5, size - 5);
self.enemy.name = @"fallingEnemy";
self.enemy.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(size - 3, size - 3)];
self.enemy.physicsBody.restitution = 0;
self.enemy.physicsBody.allowsRotation = NO;
int randomSection = arc4random_uniform(7);
switch (randomSection) {
case 0:
self.enemy.position = CGPointMake(2.5 + self.enemy.size.width/2, height-5);
break;
case 1:
self.enemy.position = CGPointMake(width/7 + self.enemy.size.width/2, height-5);
break;
case 2:
self.enemy.position = CGPointMake((width/7*2) + self.enemy.size.width/2, height-5);
break;
case 3:
self.enemy.position = CGPointMake((width/7*3) + self.enemy.size.width/2, height-5);
break;
case 4:
self.enemy.position = CGPointMake((width/7*4) + self.enemy.size.width/2, height-5);
break;
case 5:
self.enemy.position = CGPointMake((width/7*5) + self.enemy.size.width/2, height-5);
break;
case 6:
self.enemy.position = CGPointMake((width/7*6) + self.enemy.size.width/2, height-5);
break;
default:
break;
}
return self.enemy;
}
-(void)changeBlock:(SKNode *)block{
block.physicsBody.dynamic = NO;
block.name = @"staticEnemy";
}
我遇到了与您非常相似的问题（并注意到您的其他问题具有类似的性质）。我很幸运能够解决问题，希望我能为您提供一些见解。
我的情况：我正在创建一个基于物理的游戏，它使用粒子发射器和SKActions来处理游戏的某些方面。但是，我注意到这些在从不活动状态返回时"破裂"了;也就是说，尽管在进入后台之前和之后的所有属性都相同，但粒子发射器没有显示任何内容，并且即使 SKActions 在从非活动状态返回后被初始化也无法正常工作。和你一样，我使用了一个自定义的"isPaused"变量来维护游戏状态。
我的解决方案：将"isPaused"标志的名称更改为类似"gameIsPaused"的名称。
为什么？我的研究使我相信，这与场景如何保留其孩子以及SpriteKit进入背景时所做的事情的某种组合有关。虽然苹果没有公布幕后发生的事情，但各种论坛似乎表明，当应用程序处于非活动状态时，SpriteKit会自动暂停场景。
但是，通过拥有自己的"isPaused"变量，我认为您正在踩踏一些导致错误的底层流程。
其他利用 NSNotification 中心的解决方案（是什么导致我的 SKAction 计时器行为异常？）按预期重命名"isPaused"标志。