ios - (ObjC -> Swift) 转换函数 "init"& "textureNamed"

Question

当我尝试在 Swift 中转换 2 个函数时出现一些错误!

ObjC

@property (nonatomic, strong) NSMutableDictionary *textureCache;    

- (instancetype)init {
    if (self = [super init])
    {
        self.textureCache = [NSMutableDictionary dictionary];
    }
    return self;
}

- (SKTexture *)textureNamed:(NSString *)textureName {
    return _textureCache[textureName];
}

swift

var textureCache: NSMutableDictionary?    

public func init() -> Self {
    return textureCache = NSMutableDictionary()
} 

public func textureNamed(textureName: String!) -> SKTexture! {
    return textureCache(textureName)
}

在“初始化”函数中:

1. 函数声明中的预期标识符 -> (public func init -> self )
2. 无法将“NSMutableDictionary”类型的值分配给“NSMutableDictionary”类型的值？ -> (返回 textureCache = NSMutableDictionary())

对于“textureNamed”函数:

1. 无法使用“(String!)”类型的参数列表调用“textureCache”->(返回纹理缓存(纹理名称))

如果有人能帮助我，那就太棒了。

Answer 1

我会尝试这样的事情:

class Test: NSObject {

  var textureCache = [String:SKTexture]()

  override init() {
    super.init()
  }

  func textureNamed(name: String) -> SKTexture? {
    return self.textureCache[name]
  }

}