ios - 不兼容的 block 指针 SKSpriteNode

Question

这是我的代码

- (void) update:(NSTimeInterval)currentTime
{
    [self.children enumerateObjectsUsingBlock:^(SKSpriteNode * child, NSUInteger idx, BOOL *stop) {
    child.position = CGPointMake(child.position.x-self.scrollingSpeed, child.position.y);
    if (child.position.x <= -child.size.width){
        float delta = child.position.x+child.size.width;
        child.position = CGPointMake(child.size.width*(self.children.count-1)+delta, child.position.y);
        }
    }];
}

我收到一个错误

Incompatible block pointer types sending 'void (^)(SKSpriteNode *__strong, NSUInteger, BOOL *)' to parameter of type 'void (^ _Nonnull)(SKNode * _Nonnull __strong, NSUInteger, BOOL * _Nonnull)'

我也不知道为什么。我尝试将其更改为 SKNode 但它说大小不存在。

任何想法将不胜感激。

Answer 1

枚举 block 语法不正确，需要修改:

 [self.children enumerateObjectsUsingBlock:^(SKSpriteNode * child, NSUInteger idx, BOOL *stop)
{
    child.position = CGPointMake(child.position.x-self.scrollingSpeed, child.position.y);
    if (child.position.x <= -child.size.width)
    {
       float delta = child.position.x+child.size.width;
       child.position = CGPointMake(child.size.width*(self.children.count-1)+delta, child.position.y);
    }
}];

到

 [self.children enumerateObjectsUsingBlock:^(id object, NSUInteger idx, BOOL *stop)
 {
    SKSpriteNode *child = (SKSpriteNode *)object;
    child.position = CGPointMake(child.position.x-self.scrollingSpeed, child.position.y);
    if (child.position.x <= -child.size.width)
    {
       float delta = child.position.x+child.size.width;
       child.position = CGPointMake(child.size.width*(self.children.count-1)+delta, child.position.y);
    }
}];

枚举 block 的第一个参数是id类型而不是SKSpriteNode。 NSArray 没有这样的实现.