Swift利用闭包(closure)来实现传值-->前后两个控制器的反向传值
2014-06-13 17:58
417 查看
利用了大约一个多小时来搞明白OC中Blocks反向传值和Swift中Closure反向传值的差别,下面直接贴上代码:
一、第一个界面
// Created by 秦志伟 on 14-6-13.
import UIKit
class ZWRootViewController: UIViewController {
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
// Custom initialization
}
var myLabel:UILabel?
override func viewDidLoad() {
super.viewDidLoad()
var item = UIBarButtonItem(title:"下一页",style:UIBarButtonItemStyle.Plain,target:self,action:"nextBtnClicked")
self.navigationItem.rightBarButtonItem = item
myLabel = UILabel(frame:CGRectMake(0,100,320,50))
myLabel!.text = "Closure"
myLabel!.textAlignment = NSTextAlignment.Center
self.view.addSubview(myLabel!)
// Do any additional setup after loading the view.
}
func someFunctionThatTakesAClosure(string:String) -> Void {
// function body goes here
myLabel!.text = string
}
func nextBtnClicked(){
let second = ZWSecondViewController(nibName:nil,bundle:nil)
//将当前someFunctionThatTakesAClosure函数指针传到第二个界面,第二个界面的闭包拿到该函数指针后会进行回调该函数
second.initWithClosure(someFunctionThatTakesAClosure)
self.navigationController.pushViewController(second,animated:true)
}
override func viewWillDisappear(animated: Bool){
myLabel!.hidden = true
}
override func viewWillAppear(animated: Bool){
myLabel!.hidden = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// #pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
}
二、第二个界面
// Created by 秦志伟 on 14-6-13.
import UIKit
//类似于OC中的typedef
typealias sendValueClosure=(string:String)->Void
class ZWSecondViewController: UIViewController {
var i:Int?
//声明一个闭包
var myClosure:sendValueClosure?
//下面这个方法需要传入上个界面的someFunctionThatTakesAClosure函数指针
func initWithClosure(closure:sendValueClosure?){
//将函数指针赋值给myClosure闭包,该闭包中涵盖了someFunctionThatTakesAClosure函数中的局部变量等的引用
myClosure = closure
}
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
// Custom initialization
}
override func viewDidLoad() {
super.viewDidLoad()
i = 0
var btn = UIButton.buttonWithType(UIButtonType.System) as?UIButton
btn!.frame = CGRectMake(0,100,320,50)
btn!.setTitle("点击我" ,forState:UIControlState.Normal)
btn!.addTarget(self,action:"action", forControlEvents:UIControlEvents.TouchUpInside)
self.view.addSubview(btn)
// Do any additional setup after loading the view.
}
func action(){
i = i!+1
//判空
if myClosure{
//闭包隐式调用someFunctionThatTakesAClosure函数:回调。
myClosure!(string: "好好哦\(i)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// #pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
}
转载请注明!!!,欢迎加入iOS交流群:爱疯、爱Coding:209476515
一、第一个界面
// Created by 秦志伟 on 14-6-13.
import UIKit
class ZWRootViewController: UIViewController {
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
// Custom initialization
}
var myLabel:UILabel?
override func viewDidLoad() {
super.viewDidLoad()
var item = UIBarButtonItem(title:"下一页",style:UIBarButtonItemStyle.Plain,target:self,action:"nextBtnClicked")
self.navigationItem.rightBarButtonItem = item
myLabel = UILabel(frame:CGRectMake(0,100,320,50))
myLabel!.text = "Closure"
myLabel!.textAlignment = NSTextAlignment.Center
self.view.addSubview(myLabel!)
// Do any additional setup after loading the view.
}
func someFunctionThatTakesAClosure(string:String) -> Void {
// function body goes here
myLabel!.text = string
}
func nextBtnClicked(){
let second = ZWSecondViewController(nibName:nil,bundle:nil)
//将当前someFunctionThatTakesAClosure函数指针传到第二个界面,第二个界面的闭包拿到该函数指针后会进行回调该函数
second.initWithClosure(someFunctionThatTakesAClosure)
self.navigationController.pushViewController(second,animated:true)
}
override func viewWillDisappear(animated: Bool){
myLabel!.hidden = true
}
override func viewWillAppear(animated: Bool){
myLabel!.hidden = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// #pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
}
二、第二个界面
// Created by 秦志伟 on 14-6-13.
import UIKit
//类似于OC中的typedef
typealias sendValueClosure=(string:String)->Void
class ZWSecondViewController: UIViewController {
var i:Int?
//声明一个闭包
var myClosure:sendValueClosure?
//下面这个方法需要传入上个界面的someFunctionThatTakesAClosure函数指针
func initWithClosure(closure:sendValueClosure?){
//将函数指针赋值给myClosure闭包,该闭包中涵盖了someFunctionThatTakesAClosure函数中的局部变量等的引用
myClosure = closure
}
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
// Custom initialization
}
override func viewDidLoad() {
super.viewDidLoad()
i = 0
var btn = UIButton.buttonWithType(UIButtonType.System) as?UIButton
btn!.frame = CGRectMake(0,100,320,50)
btn!.setTitle("点击我" ,forState:UIControlState.Normal)
btn!.addTarget(self,action:"action", forControlEvents:UIControlEvents.TouchUpInside)
self.view.addSubview(btn)
// Do any additional setup after loading the view.
}
func action(){
i = i!+1
//判空
if myClosure{
//闭包隐式调用someFunctionThatTakesAClosure函数:回调。
myClosure!(string: "好好哦\(i)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// #pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
}
转载请注明!!!,欢迎加入iOS交流群:爱疯、爱Coding:209476515
相关文章推荐
- Swift利用闭包(closure)来实现传值-->前后两个控制器的反向传值
- Swift利用闭包(closure)来实现传值-->前后两个控制器的反向传值
- Swift利用闭包(closure)来实现传值-->前后两个控制器的反向传值
- Swift利用闭包(closure)回实现传值->前后两个控制器的反向传值
- Swift利用闭包(closure)来实现传值-->前后两个控制器的反向传值
- Swift 正向传值以及利用闭包(closure)实现反向传值(七)
- iOS开发利用协议代理实现导航控制器UINavigationController视图之间的正向传值和反向传值
- 利用协议代理实现导航控制器UINavigationController视图之间的正向传值和反向传值
- 【iOS开发-26】利用协议代理实现导航控制器UINavigationController视图之间的正向传值和反向传值
- Swift 使用代理和闭包(closure)反向传值
- Swift利用闭包反向传值
- 【iOS开发-26】利用协议代理实现导航控制器UINavigationController视图之间的正向传值和反向传值
- swift基础利用闭包在两个视图界面传值
- Swift 闭包传值 场景介绍 A->B B->A传值
- Swift 视图控制器间传值(正向和反向)
- ios开发级联菜单(利用父子控制器--两个菜单封装为两个子控制器来实现)
- Swift中闭包实现OC的block传值
- 三元组(a,b,c)标识a币种到b币种的汇率为c,反向亦成立。 输入一堆这样的三元组,再指定两个币种x y,问x->y的汇率是多少? 请编程实现,并给出时间、空间复杂度。
- 利用<div>层 和<img>标签,实现一个图片两个动画效果
- 请修改append 函数,利用这个函数实现:两个非降序链表的并集,1->2->3 和2->3->5 并为1->2->3->5 另外只能输出结果,不能修改两个链表的数据。