iOS学习- 04 控件

来源：互联网发布：大淘客和淘宝客的区别编辑：程序博客网时间：2024/05/21 18:49

1.)Picker View

绑定数据：a.) 扩展ViewController 实现 UIPickerViewDataSource , UIPickerviewDelegate Protocol (interface)

//
// ViewControllerExtension.swift
// BeautyGallery
//
// Created by Ricky Choi on 16/5/29.
// Copyright © 2016年 worm. All rights reserved.
//

import UIKit

extension ViewController: UIPickerViewDataSource {
// returns the number of 'columns' to display.
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}

// returns the # of rows in each component..
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return beauties.count
}
}

extension ViewController: UIPickerViewDelegate {
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return beauties[row]
}
}

2.)Segue - View Controller间的联线

3.) 为新的View Controller 新建立一个ViewController.类 - GalleryViewController，绑定该View Controller 到 GalleryViewController

View Contoller属性中的Class选择 GalleryViewcontroller

判断去哪个视图，需要命名Segue ,写prepareForSegue函数。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "GotoGallery" {
let index = beautyPicker.selectedRowInComponent(0)

var imageName: String?

switch index {
case 0:
imageName = "fangbingbing"
case 1:
imageName = "libingbing"
case 2:
imageName = "wangfei"
case 3:
imageName = "yangmi"
case 4:
imageName = "zhouxu"
default:
imageName = nil
}

var vc = segue.destinationViewController as! GalleryViewController
vc.imageName = imageName

}
}

//
// GalleryViewController.swift
// BeautyGallery
//
// Created by Ricky Choi on 16/5/29.
// Copyright © 2016年 worm. All rights reserved.
//

import UIKit

class GalleryViewController: UIViewController {

@IBOutlet weak var beautyImage: UIImageView!
var imageName: String?

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.

if imageName != nil {
beautyImage.image = UIImage(named: imageName!)
}

}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}


}

在第二个view返回：

a.)手动 UnWind Segue

I)在父View Controller 写

@IBAction func close(segue: UIStoryboardSegue) {
print("closed")
}

II.)在第二个view Controller中的按中联线到自己右上角的Exit，选择close方法

Full code:

//
// ViewController.swift
// BeautyGallery
//
// Created by Ricky Choi on 16/5/29.
// Copyright © 2016年 worm. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var beautyPicker: UIPickerView!

let beauties = ["范冰冰", "李冰冰", "王菲", "杨幂", "周迅"]

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
beautyPicker.dataSource = self
beautyPicker.delegate = self
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "GotoGallery" {
let index = beautyPicker.selectedRowInComponent(0)

var imageName: String?

switch index {
case 0:
imageName = "fangbingbing"
case 1:
imageName = "libingbing"
case 2:
imageName = "wangfei"
case 3:
imageName = "yangmi"
case 4:
imageName = "zhouxu"
default:
imageName = nil
}

var vc = segue.destinationViewController as! GalleryViewController
vc.imageName = imageName

}
}

@IBAction func close(segue: UIStoryboardSegue) {
print("closed")
}
}

0 0