swift 2.3.0 到3.0的转换

  1. 带参数的函数,都加入了 _ 省略参数名的标记
 func log(_ info:String) {} // 3.0
func log(info:String) {}   //2.3   
  1. 类&类成员说明public 关键字变成open

  2. 函数说明privite 关键字变成 fileprivate

  3. 枚举定义的case 语法字段命名不支持大写开头,统一采用小写

public enum BMPlayerTopBarShowCase: Int {
    case always         = 0 /// 始终显示
    case horizantalOnly = 1 /// 只在横屏界面显示
    case none           = 2 /// 不显示
}//3.0

public enum BMPlayerTopBarShowCase: Int {
    case Always         = 0 /// 始终显示
    case HorizantalOnly = 1 /// 只在横屏界面显示
    case None           = 2 /// 不显示
}//2.3

5.String 类 & UIColor 类 & Data类& TableView代理类 & Array 类 等 API的修改 ;添加了URL 的纯swift 的类实现

6.sizeof() 被MemoryLayout.size 替代

           tmp = subWord(rotateLeft(UInt32.withBytes(tmp), 8).bytes(MemoryLayout.size))//3.0
           tmp = subWord(rotateLeft(UInt32.withBytes(tmp), 8).bytes(sizeof(UInt32)))//2.3

7.操作符<< 、 >> 等 declared in protocol must be static

private protocol BitshiftOperationsType {
          static func << (lhs: Self, rhs: Self) -> Self //3.0
          func >> (lhs: Self, rhs: Self) -> Self     //2.3
}

8.DisPatch 改动较多


 DispatchQueue.global(priority: 0).async {} // 2.3

  public enum GlobalQueuePriority {

        @available(OSX, deprecated: 10.10, message: "Use qos attributes instead")
        @available(iOS, deprecated: 8.0, message: "Use qos attributes instead")
        @available(tvOS, deprecated, message: "Use qos attributes instead")
}

9.dispatch_once 被自动替换:这里有坑

private lazy var __once: () = {
      let pagesContainerHeight = SwiftPages.frame.size.height - SwiftPages.yOrigin -  SwiftPages().distanceToBottom
}() // 3.0 错误的转换,看不懂的语法

override public func drawRect(rect: CGRect) {
   dispatch_once(&token) {
      let pagesContainerHeight = self.frame.height - self.yOrigin - self.distanceToBottom
 }
}//2.3
**这里有点坑啊 ,转换的代码完全看不懂,self 被类本身替换,drawRect方法也被替换掉了,然后编译不通过,看到这个坑。。。。请绕道**

10.NSNotification API 改动:

**关于名字的使用采用了系统规定的方式:NSNotification.Name(rawValue:"自定义的名字")

  NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: KRLoginDoneNotification), object: nil)//3.0
NotificationCenter.default.removeObserver(self, name: KRLoginDoneNotification, object: nil)//2.3
 DispatchQueue.global(qos: .userInitiated).async {}

dispatch_get_global_queue(0, 0).async {} // 2.3 


dispatch_async(DispatchQueue.main{ }]  //3.0
dispatch_async(dispatch_get_global_queue(0, 0)) {}//2.3

**dispatch_group的改动**
dispatch_group_leave(group) // 2.3
group.leave() // 3.0     

12.第三方库采用3.0后的一些变化

1.MonkeyKing
MonkeyKing.shareMessage api 被 MonkeyKing.deliver 替换
                 


总结:改动影响较大,但是并不复杂,利用xcode 自动转换功能就能解决大部分问题,主要包括关键字使用,系统api 修改

post_install do |installer|
    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            config.build_settings['SWIFT_VERSION'] = '3.0'
        end
    end
end

*待续*

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