运算符 运算符分类 从操作数角度看:运算符包括一元.二元.三元.这里的一二三指操作数的数量,操作数指的是被操作的数值. 从运算符位置看:运算符分为前缀.中缀.后缀.例如:!b, b + c, c! 赋值运算符 赋值运算符( a = b )可以初始化或者更新 a 为 b 的值: 如果赋值符号右侧是拥有多个值的元组,它的元素将会一次性地拆分成常量或者变量: let (x, y) = (1, 2) // x 等于 1, 同时 y 等于 2 与 Objective-C 和 C 不同,Swift 的赋…
ios swift 实现饼状图进度条 // // ProgressControl.swift // L02MyProgressControl // // Created by plter on 7/29/14. // Copyright (c) 2014 jikexueyuan. All rights reserved. // import UIKit class ProgressControl: UIView { override init(frame: CGRect) { super.ini…
gRPC is an universal remote procedure call framework developed by Google that has been gaining interests among many software developers that were developing microservices in recent years because its open source, language neutral, compact binary size,…