DispatchTime 便捷方法

DispatchTime+Extensions.swift

extension DispatchTime: ExpressibleByIntegerLiteral {
    public init(integerLiteral value: Int) {
        self = DispatchTime.now() + .seconds(value)
    }
}

extension DispatchTime: ExpressibleByFloatLiteral {
    public init(floatLiteral value: Double) {
        self = DispatchTime.now() + .milliseconds(Int(value * 1000))
    }
}