Swift 2.3 迁移 Swift 3.0 遇到困难和部分解决方案

最新推荐文章于 2024-02-09 00:28:16 发布

白鼠闹东京

最新推荐文章于 2024-02-09 00:28:16 发布

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分类专栏： IOS swift 文章标签：迁移 swift

本文链接：https://blog.youkuaiyun.com/sbt0198/article/details/53895859

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本文档详细介绍了从Swift 2.3到Swift 3.0的代码迁移过程，包括但不限于语法变化、方法调用更新及框架使用变更等内容。

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警告：Expression of type ‘UIViewController?’ is unused

// 赋值给_，否则会报Expression of type 'UIViewController?' is unused
_ = self.navigationController?.popViewController(animated: true)

isKindOfClass没有了

// 2.3
viewController.isKindOfClass(PhoneRegViewController)
// 3.0
viewController.isKind(of: PhoneRegViewController.self)

通知也变了

// 2.3
NSNotificationCenter.defaultCenter().postNotificationName("userinfoChanged", object: notification)
// 3.0
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "userinfoChanged"), object: notification)

// 2.3
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(currentPageChanged(_:)), name: "loginPageChanged", object: nil)
// 3.0
NotificationCenter.default.addObserver(self, selector: #selector(currentPageChanged), name: NSNotification.Name(rawValue: "loginPageChanged"), object: nil)

zhege

// 2.3
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        txtReply.resignFirstResponder()
    }
// 3.0
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        txtReply.resignFirstResponder()
    }

// 2.3
btnOk.addTarget(self, action: #selector(okClick(_:)), forControlEvents: .TouchUpInside)
// 3.0
btnOk.addTarget(self, action: #selector(okClick), for: .touchUpInside)

// 2.3
var time = dispatch_time(DISPATCH_TIME_NOW, Int64(duration * Double(NSEC_PER_SEC)))
    dispatch_after(time, dispatch_get_main_queue()) {
        self.stopAnimating()
}
// 3.0
DispatchQueue.main.asyncAfter(deadline: .now() +duration) {
    self.stopAnimating()
}

// 2.3
self.arrow.frame = CGRectOffset(arrow.frame, 0, 0)
// 3.0
self.arrow.frame = arrow.frame.offsetBy(dx: 0, dy: 0)