swift-闭包-相当于OC中的block
用法1:当作属性用
//枚举值
enum ClickType {
case Login, OnlineQuote, ProductIntroduction, MyTask, Phone
}
//定义闭包
typealias clickButtonsFuction = (_ clickType:ClickType)->Void
var clickButton : clickButtonsFuction?
@IBAction func clickLoginButton(_ sender: AnyObject) {
if clickButton != nil {
clickButton!(ClickType.login)
}
}
//在外界使用时
let headView = Bundle.main.loadNibNamed("HomeHeadView", owner: nil, options: nil)?.last as? HomeHeadView
headView!.clickButton = {
(clickType: ClickType)->Void in
switch clickType {
case ClickType.login:
self.presentToLogin()//登录
default:break
}
用法2:直接当做参数传给外界
//简单封装一个alert
class var current : LAlert {
struct Private {
static let instance = LAlert()
}
return Private.instance
}
//定义变量
typealias clickAlertButtonFunction = (_ index:Int)->Void
var clickAlertButtonsBlock : clickAlertButtonFunction?
//封装alert
func showAlertInViewController(viewController:UIViewController, title:String?, message:String, buttons:Array, clickButtonBlock:@escaping clickAlertButtonFunction)->Void{
let alertController : UIAlertController = UIAlertController.init(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
clickAlertButtonsBlock = clickButtonBlock
for index in 0..<buttons.count {
let action : UIAlertAction = UIAlertAction.init(title: buttons[index], style: UIAlertActionStyle.default, handler: { (action) in
if self.clickAlertButtonsBlock != nil {
self.clickAlertButtonsBlock!(index)
}
alertController.dismiss(animated: true, completion: nil)
})
alertController.addAction(action)
}
viewController.present(alertController, animated: true, completion: nil)
}
//应用场景
LAlert.current.showAlertInViewController(viewController: self, title: "错误提示 ", message: "手机号码不正确", buttons: ["知道了"], clickButtonBlock: { (index) in
})
