如何从对象外部运行或执行SKAction？

问题描述

我有一些代码如下：

-(void) createBall {

    _ballSprite = [SKSpriteNode spriteNodeWithImageNamed:@"ball0001"];
    _ballSprite.position = CGPointMake(firstNode.position.x, firstNode.position.y);
     SKAction *ballScale =[SKAction scaleXTo:-0.5 duration:0];
     SKAction *ballMove = [SKAction moveByX:0 y:-300 duration:0];
     SKAction *ballMoveScale = [SKAction sequence:@[ballScale,ballMove];
     SKAction *ballScaleMove = [SKAction sequence:@[ballMove,ballScale]; //Unused variable
     [_ballSprite runAction:ballMoveScale];
     [self addChild:_ballSprite];

}

现在如何从外面运行let say ballScaleMove例如。在touchBegan处理程序内或在initWithSize ..etc。？

Now how do I run let say ballScaleMove from out side eg. inside the touchBegan handler or at initWithSize ..etc.?

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

///here maybe
[_ballSprite runAction:ballScaleMove];  // Error undeclare identifier 'ballScaleMove';


}

推荐答案

您需要将属性或iVars定义为全局属性。在类的@interface中定义它们

You need to define your properties or iVars as global. define them in the @interface of your class

@interface
@property Class *myProperty;
@end

然后你可以使用self.myProperty或_myProperty访问它们（访问隐式iVar为您的财产）

Then you can access them with self.myProperty or _myProperty (accessing the implicit iVar for your property)

我希望它有所帮助

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