objective-c - NSPoint as dictionary index

Question

I need to have data structure, each element in which is accessible by pair of (x,y) (like nspoint).

I can store them in NSDictionary with keys like @"8,10", but I'm looking for more elegant and efficient solution (I don't want to have two dimensional array cause I want to have O(1) access to elements by coordinate)

Answer 1

您可以使用NSValueas 键（+NSValue valueWithCGPoint:请参阅此链接），可能有点“轻”。否则，如果值是 x 和 y 对有一些限制，例如 x 为 256，y 为 256，您可以使用位掩码，其中前 8 位表示 x 值，后 8 位表示 y 值（因为 256 = 2^8)。