8.4 组织播放器

控件

目前为止学的控件有UIlabel、UIProgress、UIImage、UIbutton、UItableView

各个空间的继承关系

1. UILabel -> UIView ->UIResponder -> NSObject

2. UIButton -> UIControl ->UIView

3. UIImagerView -> UIView

4. UIButton -> UIControl -> UIView //直接设置动作，触发事件

5. UITableView -> UIScrollView //协议或闭包获取数据

HTTP请求

let path = "[http://divein.club"](http://divein.club")

let url = NSURL(String: path)

let task = NSURLSEssion.sharedSession().dataTaskWithURL
(url!, completionHandle:{
        (data, response, error ) in
        if error == nil {
            if let httpResponse = response as?
            NSHTTPURLResponse {
            if httpResponse .statusCode == 200
            {
                if let d = data {
                    do {
                        let array = try! NSJSONSerialization.
                        jsonObjectWithData(d, options: .AllowFragments ) as?
                        Array
                     }    
                }
            }
        }
    }  )
}                     
task.resume( )

百分号转义

let p = "[http://divein.club./中国"](http://divein.club./%E4%B8%AD%E5%9B%BD%22)  非法
let origin: NSString = "中国"
let encode = origin.stringByAddingPercentEscape( )
let p = "[http://divein.club/"](http://divein.club/%22) + encode

音频播放

import AVFoundation

let path = "/..../a.mp3"
let url = NSURL(fileWithPath: path)
let player = try! AVAudioPlayer(contentOfURL: url)
player.delegate = self
player.enableRate = true       //变速
player.rate = 2                       //2倍速度播放
player.volume = 0.3              //音量

player.prepare()
player.play()

player.duration
player.currentTime

AVAudioPlayerDelegate
audioPlayer didFinish...

定时器

timer.invalidata( 
)            定时器不用了一定要停掉

####页面跳转

页面：UIViewController或它的子类
弹出新页面：已经弹出的页面.presentViewController(viewCtrl, animate: true, completion: nil)
消失：self.dismissView....