摘要：
1. let cornerValue = UIRectCorner.topRight.rawValue|UIRectCorner.bottomRight.rawValue let corner = UIRectCorner(rawValue: cornerValue) let path = UIBe 阅读全文
摘要：
//单行单例法 static let shareTool = Tool() // 私有init避免其他类尝试调用 private override init() { super.init() } //全局单例法 private let privateTool = Tool() class Tool 阅读全文