Objective c 已尝试添加已具有父节点的SKNode

目前正试图找到一个问题的解决方案，该问题正在损害我的应用程序。我想看看是否可以更改以下代码以减少内存需求。现在，我有五种方法，它们都是这样做的

-(void)createObstacle0 {
  int yMin = (CGRectGetMidY(self.frame)+190);
  int yMax = (CGRectGetMidY(self.frame)+270);
  CGPoint startPoint = CGPointMake(-20, yMin + arc4random_uniform(yMax - yMin));

  SKSpriteNode *obstacle = [SKSpriteNode spriteNodeWithImageNamed:@"obstacle"];
  obstacle.position = CGPointMake(startPoint.x, startPoint.y);
  obstacle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:21.5];
  obstacle.physicsBody.categoryBitMask = enemyCategory;
  obstacle.physicsBody.contactTestBitMask = playerCategory;
  obstacle.physicsBody.dynamic = NO;
  obstacle.name = @"obstacle0";
  [self addChild:obstacle];

  [obstacle runAction:[SKAction moveTo:CGPointMake(340, startPoint.y) duration:minTime + arc4random_uniform(maxTime - minTime)]];
  float randomNum = arc4random_uniform(3.0) + 0.1;
  [self performSelector:@selector(createObstacle0) withObject:nil afterDelay:randomNum];
}

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我尝试在.h文件中声明一个SKSpriteNode，并让每个方法使用它，而不是在它们内部声明的SKSpriteNode，但是我得到了上面的错误。有人能告诉我如何更改代码，使图像障碍物只加载一次。

从您发布的代码中可以看出，您正在运行一个无休止的循环来创建障碍物对象

尝试删除代码行[self-performSelector:@selectorcreateObstacle0 withObject:nil afterDelay:randomNum]

添加如下计时器功能：

- (void)startTimer
{
[NSTimer scheduledTimerWithTimeInterval:1
                                 target:self
                               selector:@selector(timerAction)
                               userInfo:nil
                                repeats:YES];
}

-(void)timerAction
{
    NSLog(@"do something");
}

您可以这样调用startTimer方法来启动startTimer方法[self startTimer]

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您可以从init方法或任何需要的地方执行此操作。

这里可能有一个更像SpriteKit的答案。您还可以将大量创建过程放入后台线程中的一个块中，然后在主线程中执行添加和操作，具体取决于应用程序中其他内容的强度。下面这个例子的关键是它使用动作，并且序列有一个键

-(void)createObstacleRepeatingMethod {

int yMin = (CGRectGetMidY(thingShowingObstacles.frame)+190);
int yMax = (CGRectGetMidY(thingShowingObstacles.frame)+270);

CGPoint startPoint = CGPointMake(-20, yMin + arc4random_uniform(yMax - yMin));
SKSpriteNode *obstacle = [SKSpriteNode spriteNodeWithImageNamed:@"obstacle"];

obstacle.position = CGPointMake(startPoint.x, startPoint.y);

obstacle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:21.5];
obstacle.physicsBody.categoryBitMask = obstacleCategory;
obstacle.physicsBody.contactTestBitMask = playerCategory;
obstacle.physicsBody.dynamic = NO;
obstacle.name = @"obstacle0";

[thingShowingObstacles addChild:obstacle];
[obstacle runAction:[SKAction moveTo:CGPointMake(340, startPoint.y) duration:minTime + arc4random_uniform(maxTime - minTime)]];

SKAction *waitAction = [SKAction waitForDuration:1.5 withRange:1.4];
SKAction *callCreateObstacleAgain = [SKAction runBlock:^{
    [thingShowingObstacles createObstacleRepeatingMethod];
}];

SKAction *theSequenceForWaitThenCall = [SKAction sequence:@[waitAction, callCreateObstacleAgain]];

[thingShowingObstacles runAction:theSequenceForWaitThenCall withKey:@"createObstacleSequence"];

//the sequence having a key also ensures that there will only ever be one of the sequence actions running
//it also ensures that you have fine grained control over removing the action by calling
[thingShowingObstacles removeActionForKey:@"createObstacleSequence"]; }

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是的，我知道，对象一直在生成，直到玩家击中其中一个对象并切换场景，这是故意的。@user3552678-在你移除线后它工作了吗？它工作了，没有崩溃或任何事情，但我的游戏有很多对象从侧面来，没有那条线，它们不会继续来，只有一个会。@user3552678-我已经修改了代码示例，添加了一个计时器，用于替换您删除的计时器。这与我的有什么不同？当我试着运行一个以上的时候，它会运行数百次