Swift中界面?zhèn)髦档姆椒? 主要有三種
1.代理傳值
2.閉包傳值(即OC中的Block)
- 屬性傳值
代理傳值
First頁(yè)面
class FirstViewController: UIViewController ,ValueDelegate {
//設(shè)置屬性label 后面加個(gè)! 代表在需要的時(shí)候再初始化
var label : UILabel!
override func viewDidLoad() {
super.viewDidLoad()
//設(shè)置導(dǎo)航視圖控制器的右邊按鈕
//在Swift中設(shè)置枚舉值時(shí)候使用的是枚舉類(lèi)名 + . 枚舉名 在這里系統(tǒng)幫我們自動(dòng)省略掉類(lèi)名
//在設(shè)置事件的時(shí)候 ("方法名")
self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "jumpToSecondVCClick")
//初始化label的位置
label = UILabel(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
//設(shè)置label的背景顏色
label.backgroundColor = UIColor.cyanColor()
//將label添加到視圖上
self.view.addSubview(label)
}
//聲明導(dǎo)航視圖控制器的按鈕 點(diǎn)擊事件
func jumpToSecondVCClick() {
let secondVC = SecondViewController()
//設(shè)置代理
secondVC.delegate = self
//跳轉(zhuǎn)到第二個(gè)頁(yè)面
self.showViewController(secondVC, sender: nil)
}
//實(shí)現(xiàn)代理方法
func valueClicked(string: String) {
label.text = string
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Second頁(yè)面
//聲明協(xié)議 同OC相同 還是需要寫(xiě)到類(lèi)的上面
protocol ValueDelegate {
//聲明代理方法
func valueClicked(string : String)
}
class SecondViewController: UIViewController {
//設(shè)置代理屬性 必須置為nil
var delegate : ValueDelegate? = nil
//設(shè)置輸入框?qū)傩? var TF : UITextField!
override func viewDidLoad() {
super.viewDidLoad()
//設(shè)置頁(yè)面的顏色
self.view.backgroundColor = UIColor.whiteColor()
//設(shè)置導(dǎo)航視圖控制器的左邊按鈕
self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Cancel, target: self, action: "jumpToFristVCClick")
//初始化輸入框并設(shè)置frame
TF = UITextField(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
TF.backgroundColor = UIColor.cyanColor()
//將輸入框添加到視圖上
self.view.addSubview(TF)
}
//設(shè)置跳轉(zhuǎn)時(shí)間
func jumpToFristVCClick() {
//當(dāng)跳轉(zhuǎn)到Frist頁(yè)面的時(shí)候 設(shè)置代理將輸入款輸入的文字傳到First頁(yè)面
self.delegate?.valueClicked(TF.text!)
//跳轉(zhuǎn)到First頁(yè)面
self.navigationController?.popViewControllerAnimated(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
閉包傳值
關(guān)于UI的代碼與上面的一模一樣 只是傳值的方式不一樣,在下面就不添加過(guò)多的注釋了
First頁(yè)面
class FirstViewController: UIViewController{
var label : UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "jumpToSecondVCClick")
label = UILabel(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
label.backgroundColor = UIColor.cyanColor()
self.view.addSubview(label)
}
func jumpToSecondVCClick() {
let secondVC = SecondViewController()
//將傳過(guò)來(lái)的值 賦給label
secondVC.sendValueClsure = { (string : String) -> Void in
self.label.text = string
}
self.showViewController(secondVC, sender: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Second頁(yè)面
//重命名一個(gè)閉包
typealias sendValue = (string : String) -> Void
class SecondViewController: UIViewController {
//創(chuàng)建一個(gè)閉包屬性
var sendValueClsure : sendValue?
var TF : UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.whiteColor()
self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Cancel, target: self, action: "jumpToFristVCClick")
TF = UITextField(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
TF.backgroundColor = UIColor.cyanColor()
self.view.addSubview(TF)
}
func jumpToFristVCClick() {
//將值附在閉包上,傳到First頁(yè)面
self.sendValueClsure!(string: TF.text!)
self.navigationController?.popViewControllerAnimated(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
屬性傳值
UI與上兩個(gè)基本一樣,將First頁(yè)面的UILabel換成UITextField 即可
Frist頁(yè)面
class FirstViewController: UIViewController{
var TF : UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "jumpToSecondVCClick")
TF = UITextField(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
TF.backgroundColor = UIColor.cyanColor()
self.view.addSubview(TF)
}
func jumpToSecondVCClick() {
let secondVC = SecondViewController()
//將輸入框中輸入的文字賦值給Second控制器的屬性string
secondVC.string = TF.text
self.showViewController(secondVC, sender: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Second頁(yè)面
class SecondViewController: UIViewController {
var string : String? = nil
var TF : UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.whiteColor()
self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Cancel, target: self, action: "jumpToFristVCClick")
TF = UITextField(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
TF.backgroundColor = UIColor.cyanColor()
//將從First頁(yè)面?zhèn)骰貋?lái)的string的值賦給Second的TF
TF.text = string
self.view.addSubview(TF)
}
func jumpToFristVCClick() {
self.navigationController?.popViewControllerAnimated(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
在這三天的Swift學(xué)習(xí)中 ,我發(fā)現(xiàn) 在使用時(shí) ,其實(shí)大部分用到了OC中的方法和思想,只是Swift相比OC的代碼格式上更加簡(jiǎn)潔和易記
由此可見(jiàn),如果有OC基礎(chǔ)的學(xué)習(xí)者們,在學(xué)習(xí)Swift的時(shí)候,只需要研究下Swift和OC的格式區(qū)別對(duì)于上手Swift還是相當(dāng)快的
