Ios 当我们将nil指向sprite节点时会发生什么？

从上面的代码decorativeBall=nil和golfBall=nil来看，它有助于释放内存还是有意义？

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我想做的是，若有高尔夫球已经被选中，现在若球员已经把它换成装饰球。我想从场景中移除高尔夫球，这是正确的方法吗？

我假设

DecorativeBall

和

GolfBall

都是

SKSpriteNode

的子类，并且您正在使用ARC

由于电弧，

golfBall=nil

确实释放了精灵，但这还不够，至少还有一个对它的引用：首先需要调用

[golfBall removeFromParent]将其从层次结构中移除。当然，
decorativeBall
也是如此

@interface Player()
@property (nonatomic) SKTextureAtlas *atlas;
@end
@implementation Player{
    DecorativeBall *decorativeBall; 
    GolfBall *golfBall; 
}
- (id) initWithBallName :(NSString *) name{
    if(self = [super init]){
        _atlas = [SKTextureAtlas atlasNamed:@"Balls"];
        [self removeAllChildren];
        if ([name isEqualToString:@"DecorativeBall"]) // if it is a decorative ball{
            if (debug){
                printf("\n\n It's a Decorative ball");
            }
            if (!decorativeBall){
                 decorativeBall = [[DecorativeBall alloc] initWithTexture:[_atlas textureNamed:@"DecorativeBall"]];
                golfBall = nil;
            }
            [self addChild:decorativeBall];
        }
        if ([name isEqualToString:@"GolfBall"]) // if it is a golf ball{
            if (debug){
                printf("\n\n It's a Golf ball");
            }
            if (!golfBall){
                golfBall = [[GolfBall alloc] initWithTexture:[_atlas textureNamed:@"GolfBall"]];
                decorativeBall = nil;
            }
            [self addChild:golfBall];
        }
    }
    return self;
}
@end