酱油09 － 文件管理器／文件处理器／ScrollView

1. 文件管理（NSFileManager）

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        //文件管理器
        let fileManager = NSFileManager.defaultManager()
        //设置路径
        let path = NSHomeDirectory() + "/Documents/1.plist"
        print(path)
        if fileManager.fileExistsAtPath(path){
            
            try! fileManager.removeItemAtPath(path)
            
            
        }else{
            let h = "happy day"
            //创建plist文件
            fileManager.createFileAtPath(path, contents: h.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true), attributes: nil)
        
        }
        
        let file = NSHomeDirectory() + "/Documents/2/3/4"
        //创建文件夹
        try! fileManager.createDirectoryAtPath(file, withIntermediateDirectories: true, attributes: nil)
        let a = try! fileManager.attributesOfItemAtPath(path)
        print(a[NSFileSize])
    }
}

2. 文件处理器（NSFileHandle）

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let fileManager = NSFileManager.defaultManager()
        
        let path = NSHomeDirectory() + "/Documents/1.plist"
        print(path)
        if fileManager.fileExistsAtPath(path){
            print("文件存在")
            
        }else{
            let h = "happy day"
            
            fileManager.createFileAtPath(path, contents: h.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true), attributes: nil)
            
        }
        
        //设置文件处理器（可写，可读，可更新）
        
        let handle = NSFileHandle.init(forReadingAtPath: path)
        //设置读取文件数据的长度（默认每一次执行都是从0开始读取数据）
        let d1 = handle?.readDataOfLength(2)
        print(d1?.length)
        print(NSString(data: d1!, encoding: NSUTF8StringEncoding))
        
        let hadle1 = NSFileHandle.init(forWritingAtPath: path)
        let s = "tu s"
        //string -> NSData
        let d = s.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)
        hadle1?.writeData(d!)
        print(NSString(data: d!, encoding: NSUTF8StringEncoding))
    }
}

3. Scrollview

import UIKit

class ViewController: UIViewController,UIScrollViewDelegate {
    
    var scrollview : UIScrollView!
    override func viewDidLoad() {
        super.viewDidLoad()
        //设置scrollview
        scrollview = UIScrollView(frame: CGRect(x: 0, y: 100, width: self.view.frame.size.width, height: 200))
        scrollview.backgroundColor = UIColor.brownColor()
        self.view.addSubview(scrollview)
        
        //设置textview
        let textview = UITextView(frame: CGRect(x: 0, y: 0, width: scrollview.frame.size.width, height: scrollview.frame.size.height/2))
        textview.backgroundColor = UIColor.redColor()
        scrollview.addSubview(textview)
        
        
        //关联方法
        scrollview.delegate = self
        //开启翻页
        scrollview.pagingEnabled = true
        
        //设置偏移时整个视图位置大小
        scrollview.contentSize = CGSize(width: self.view.frame.size.width * 4, height: self.view.frame.size.height)
        //开启方向锁（一次只能一个方向）
        scrollview.directionalLockEnabled = true
        
        //弹性效果
        scrollview.bounces = false
        scrollview.showsHorizontalScrollIndicator = false
        scrollview.showsVerticalScrollIndicator = false
        
        //创建分页对象
        let page = UIPageControl()
        //设置分页数目
        page.numberOfPages = 3
        page.frame = CGRect(x: scrollview.frame.size.width/2-50, y: scrollview.frame.size.height, width: 100, height: 100)
        page.currentPageIndicatorTintColor = UIColor.blackColor()
        page.addTarget(self, action: #selector(didchange(_:)), forControlEvents: .ValueChanged)
        self.view.addSubview(page)
    }
    
    func didchange(sender: UIPageControl){
        //设置偏移位置
        let rect = CGPoint(x: scrollview.frame.size.width * CGFloat(sender.currentPage), y: 0)
        //设置偏移动画
        scrollview.setContentOffset(rect, animated: true)
    }
    
    func scrollViewWillBeginDragging(scrollView: UIScrollView) {
        print("开始拖动")
    }
    
    func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) {
        print("完成拖动")
    }
    func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        print("开始减速")
    }
    func scrollViewWillBeginDecelerating(scrollView: UIScrollView) {
        print("停止减速")
    } 
}