Sprite kit 当连接物理体并施加脉冲时，SKSpriteNode发生振动

我注意到我的子类

SKSpriteNode

中有一些非常奇怪的东西，它附加了物理体并对脉冲做出响应

它附加了一个

SKPhysicsBody

，但当对精灵施加脉冲时，它会在移动过程中振动。这很烦人，看起来很糟糕

这可能是什么原因造成的

以下是设置代码：

self.texture = [[SKTextureAtlas atlasNamed:@"karl"]textureNamed:@"karlidle-1"];

    self.size = CGSizeMake(69.0, 93.0);
    self.userInteractionEnabled = NO;
    self.name = @"karl";

    self.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(69.0, 93.0)];
    self.physicsBody.dynamic = YES;
    self.physicsBody.allowsRotation = NO;
    self.physicsBody.affectedByGravity = YES;
    self.physicsBody.usesPreciseCollisionDetection = YES;
    self.physicsBody.mass = 1.0;
    self.physicsBody.linearDamping = 0.0;
    self.physicsBody.angularDamping = 0.0;
    self.physicsBody.restitution = 0.3;

    self.physicsBody.categoryBitMask = karlCategory;
    self.physicsBody.collisionBitMask = obstaclesCategory|floorCategory|wallCategory;
    self.physicsBody.contactTestBitMask = obstaclesCategory|floorCategory|wallCategory;

并运用冲动：

 if (self.physicsBody.velocity.dy >= kKarlMaxVelocity) {

        self.physicsBody.velocity = CGVectorMake(0, kKarlMaxVelocity);
    }
    else if (self.physicsBody.velocity.dy <= kKarlLowVelocityBoostThreshold){

        self.physicsBody.velocity = CGVectorMake(0, kKarlVelocityImpulseIncrement*kKarlVelocityBoost);
    }
    else{

        [self.physicsBody applyImpulse:CGVectorMake(0, kKarlVelocityImpulseIncrement)];
        //[self.physicsBody applyForce:CGVectorMake(0, 3000) atPoint:self.frame.origin];
        //self.physicsBody.velocity = CGVectorMake([self returnNormalisedXVelocity], self.physicsBody.velocity.dy);
    }

if（self.physicsBody.velocity.dy>=kKarlMaxVelocity）{
self.physicsBody.velocity=CGVectorMake（0，kKarlMaxVelocity）；
}
否则如果（self.physicsBody.velocity.dy）你多久应用一次冲动？你多久应用一次冲动？