不兼容的塊指針SKSpriteNode

Question

這是我的代碼

- (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); 
     } 
    }]; 
} 

，我得到一個錯誤

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

，我不知道爲什麼。我試圖將其更改爲SKNode，但它說尺寸不存在。

任何想法將不勝感激。

Answer 1

枚舉塊語法是不正確的，你需要改變：

[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); 
    } 
}]; 

枚舉塊的第一個參數是id不SKSpriteNode類型。 NSArray沒有這樣的實現。