新增访问符关键字: open,fileprivate
Apple 官网解释
open: 公开访问接口,类和成员变量是可以被模块内外 override
public: 公开访问接口,但是只能在模块内被 override
internal: 只在模块中访问
fileprivate: 只在当前文件中访问
private: 只在当前文件中访问,并且其 extension 里也不能访问
所以使用 open 访问符时需要考虑可能被模块外的代码复写
方法签名和调用的变更
举例:
enum PullToRefreshState {
- case Pulling - case Triggered - case Refreshing - case Stop + case pulling
+ case triggered
+ case refreshing
+ case stop
}
声明枚举中的case需要小写开头
- func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
+ func application(_ application: UIApplication,didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
- self.posterImageView.contentMode = .ScaleAspectFill
- self.posterImageView.frame = CGRectMake(0,0,self.view.wly_width,BarViewHeight);
+ self.posterImageView.contentMode = .scaleAspectFill
+ self.posterImageView.frame = CGRect(x: 0,y: 0,width: self.view.wly_width,height: BarViewHeight);
- self.customBar.frame = CGRectMake(0,BarViewHeight);
+ self.customBar.frame = CGRect(x: 0,height: BarViewHeight);
- self.tableView.registerClass(WLYArticleTableViewCell.self,forCellReuseIdentifier: WLYArticleTableViewCell.identifier)
+ self.tableView.register(WLYArticleTableViewCell.self,forCellReuseIdentifier: WLYArticleTableViewCell.identifier)
- func tableView(tableView: UITableView,cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
- let cell = tableView.dequeueReusableCellWithIdentifier(WLYArticleTableViewCell.identifier) as! WLYArticleTableViewCell
+ func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+ let cell = tableView.dequeueReusableCell(withIdentifier: WLYArticleTableViewCell.identifier) as! WLYArticleTableViewCell
- tableView.deselectRowAtIndexPath(indexPath,animated: true) + tableView.deselectRow(at: indexPath,animated: true)
- self.collectionView.scrollEnabled = false
- self.collectionView.backgroundColor = UIColor.whiteColor()
- self.collectionView.registerClass(WLYArticleDetailCell.self,forCellWithReuseIdentifier: WLYArticleDetailCell.identifier)
+ self.collectionView.isScrollEnabled = false
+ self.collectionView.backgroundColor = UIColor.white
+ self.collectionView.register(WLYArticleDetailCell.self,forCellWithReuseIdentifier: WLYArticleDetailCell.identifier)
- self.arrow.center = CGPointMake(self.frame.size.width / 2,self.frame.size.height / 2)
- self.arrow.frame = CGRectOffset(arrow.frame,0)
+ self.arrow.center = CGPoint(x: self.frame.size.width / 2,y: self.frame.size.height / 2)
+ self.arrow.frame = arrow.frame.offsetBy(dx: 0,dy: 0)
- self.titleLabel.font = UIFont.systemFontOfSize(15)
+ self.titleLabel.font = UIFont.systemFont(ofSize: 15)
- self.themeArray?.insert(self.homePageTheme(),atIndex: 0)
+ self.themeArray?.insert(self.homePageTheme(),at: 0)
- self.stateButton.setTitle("夜间",forState: .Normal)
- self.stateButton.setTitleColor(UIColor.wly_darkTextColor,forState: .Normal)
- self.stateButton.setImage(UIImage(named: "Menu_Dark"),forState: .Normal)
- self.stateButton.titleLabel?.font = UIFont.systemFontOfSize(13)
+ self.stateButton.setTitle("夜间",for: UIControlState())
+ self.stateButton.setTitleColor(UIColor.wly_darkTextColor,for: UIControlState())
+ self.stateButton.setImage(UIImage(named: "Menu_Dark"),for: UIControlState())
+ self.stateButton.titleLabel?.font = UIFont.systemFont(ofSize: 13)
- guard let hexString: String = rgba.substringFromIndex(rgba.startIndex.advancedBy(1)),+ guard let hexString: String = rgba.substring(from: rgba.characters.index(rgba.startIndex,offsetBy: 1)),
GCD
GCD 使用了面向对象的方式调用
- let time = dispatch_time(DISPATCH_TIME_NOW,(Int64)(3 * NSEC_PER_SEC))
- dispatch_after(time,dispatch_get_main_queue()) {
+ let time = DispatchTime.now() + Double((Int64)(3 * NSEC_PER_SEC)) / Double(NSEC_PER_SEC)
+ DispatchQueue.main.asyncAfter(deadline: time) {
Block: @escaping && @autoclosure
- 当闭包作为参数传入一个方法,并且该闭包是在方法返回后才被调用,我们称为闭包的”逃逸”,需要添加 @escaping 标识,
- 否则编译器会报错 当使用了@escaping标识了一个闭包时,必须在闭包中明确地引用self
- static func requestLatestArticles(completion: (WLYDailyArticle?,NSError?) -> Void) { + static func requestLatestArticles(_ completion: @escaping (WLYDailyArticle?,NSError?) -> Void) {
文／afluy（简书作者）
原文链接：http://www.jianshu.com/p/4820aa9a2625 著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。
