我一直在这里寻找很多问题,我找到了一个类似标题
Enum case switch not found in type,但没有解决方案.
我想使用带有自身变异的枚举来解决问题,在个别状态下,下一个交通灯颜色是什么.
enum TrafficLights {
mutating func next() {
switch self {
case .red:
self = .green
case .orange:
self = .red
case .green:
self = .orange
case .none:
self = .orange
}
}
}
我已将所有案例作为可能的选项,它仍然返回错误：
Enum ‘case’ not found in type ‘TrafficLights’
案例必须在函数之外声明：
enum TrafficLights {
case green
case red
case orange
case none
mutating func next() {
switch self {
case .red:
self = .green
case .orange:
self = .red
case .green:
self = .orange
case .none:
self = .orange
}
}
}