enum category: UInt32 {
case fence = 1
case paddle = 2
case block = 4
case ball = 8
}
struct category{
static var fence:UInt32 = 1
static var paddle:UInt32 = 2
static var block:UInt32 = 4
static var category:UInt32 = 8
}
我想创建一组位掩码,不知道该用哪种方法。
枚举还是结构体?