图片浏览器

//
//  ViewController.swift
//  图片浏览器
//
//  Created by admin on 15/12/24.
//  Copyright © 2015年 jin. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var preButton: UIButton!
    @IBOutlet weak var nextButton: UIButton!
    @IBOutlet weak var titleLable: UILabel!
    @IBOutlet weak var imageDescription: UILabel!
    //图片名称数组,
    lazy var imageArr:[NSDictionary] =
    {
        //获取 plist文件路径
        var filePath:String = (NSBundle.mainBundle().pathForResource("imageData", ofType: "plist"))!
        //从文件中读取配置信息
        var imageArr:NSArray! = NSArray(contentsOfFile: filePath)!
        //转换类型并返回
        return imageArr as! [NSDictionary]
    }()

    //当前显示图片的下标
    static var imageIndex = 0
    override func viewDidLoad() {
        super.viewDidLoad()

//        print(self.imageArr[0]["image"]!)
        updateImageView()
//        imageView.image = UIImage(imageLiteral: "2")
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    //上一张图片
    @IBAction func preImage(sender: AnyObject) {
        ViewController.imageIndex--
        updateImageView()
    }
    //下一张图片
    @IBAction func nextImage(sender: AnyObject) {
        ViewController.imageIndex++
        updateImageView()
    }
    //更新页面
    func updateImageView()
    {
        //更新标题
        titleLable.text = "\(ViewController.imageIndex+1)/\(imageArr.count)"
        //设置上一页下一页按钮的状态
        preButton.enabled = ViewController.imageIndex != 0
        nextButton.enabled = ViewController.imageIndex < (imageArr.count - 1)
        //做个动画效果
        UIView.animateWithDuration(1, animations: {
            //
            if self.imageArr.count > ViewController.imageIndex
            {
                //设置 imageView 透明度，为了动画效果
                self.imageView.alpha = 0
                //设置 imageView 的图片
                self.imageView.image = UIImage(imageLiteral: self.imageArr[ViewController.imageIndex]["image"] as! String)
                //设置 当前图片的描述
                self.imageDescription.text = self.imageArr[ViewController.imageIndex]["description"] as? String
                self.imageView.alpha = 1
            }
        })
    }

}