最近在學(xué)Swift，也是剛剛開(kāi)始。這里對(duì)自己最近所學(xué)做個(gè)簡(jiǎn)單的總結(jié)：視頻和代碼都在下面

http://pan.baidu.com/s/1sjHd5qX

1.String和NSString的不同

1 Swift的String類(lèi)型是值類(lèi)型。如果你創(chuàng)建了一個(gè)新的字符串值，那么當(dāng)其進(jìn)行常量、變量賦值操作或在函數(shù)/方法中傳遞時(shí)，會(huì)進(jìn)行值拷貝。 2 3 在不同的情況下，都會(huì)對(duì)已有字符串值創(chuàng)建新的副本，并對(duì)該新副本進(jìn)行傳遞或賦值。 4 5 這和OC中的NSString不同，當(dāng)您在OC創(chuàng)建了一個(gè)NSString實(shí)例，并將其傳遞給一個(gè)函數(shù)/方法,或者賦給一個(gè)變量，您永遠(yuǎn)都是傳遞或賦值同一個(gè)NSString實(shí)例的一個(gè)引用。 6 7 除非您特別要求其進(jìn)行值拷貝，否則字符串不會(huì)進(jìn)行賦值新副本操作。

2.異步獲取數(shù)據(jù)

1 NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler:{(response:NSURLResponse!, data:NSData!, error:NSError!)->Void in 2 var jsonResult:NSDictionary = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary 3 //why just miss an excalmatory mark, the code isn't compile 4 //self.delegate?.didRecieveResults(jsonResult) 5 })

3.UI焦點(diǎn)的易操作

在UI的界面種可以直接在View上點(diǎn)擊鼠標(biāo)右鍵，并拖入相應(yīng)的Controller的代碼中，且生成@IBOutlet和@IBAction。代碼都不用手寫(xiě)了，很方便。

4.視圖之間的跳轉(zhuǎn)，傳參，回跳

1 //頁(yè)面跳轉(zhuǎn)時(shí)，將數(shù)據(jù)傳過(guò)去 2 override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) { 3 var channelC:ChannelController = segue.destinationViewController as ChannelController 4 channelC.delegate = self// What TODO 5 channelC.channelData = self.channelData 6 } 1 //點(diǎn)擊事件 2 func tableView(tableView:UITableView!, didSelectRowAtIndexPath indexPath:NSIndexPath!) { 3 //what is do this 4 var rowData:NSDictionary = self.channelData[indexPath.row] as NSDictionary 5 let channelId:AnyObject = rowData["channel_id"] as AnyObject 6 let channel:String = "channel=\(channelId)" 7 delegate?.onChangeChannel(channel) 8 self.dismissViewControllerAnimated(true, completion: nil) 9 }

5.MP3在線播放

1 //定義一個(gè)播放器 2 var audioPlayer:MPMoviePlayerController = MPMoviePlayerController() 3 4 //設(shè)置音樂(lè) 5 func onSetAudio(url:String) { 6 timer?.invalidate() 7 timeLabel.text = "00:00" 8 9 self.audioPlayer.stop() 10 self.audioPlayer.contentURL = NSURL(string:url) 11 self.audioPlayer.play() 12 timer = NSTimer.scheduledTimerWithTimeInterval(0.4 , target : self, selector : "onUpdate", userInfo: nil, repeats :true) 13 14 playBtn.removeGestureRecognizer(tap) 15 logo.addGestureRecognizer(tap) 16 playBtn.hidden = true 17 }

6.TableView列表Item的出現(xiàn)動(dòng)畫(huà)

1 func tableView(tableView: UITableView!, willDisplayCell cell: UITableViewCell!, forRowAtIndexPath indexPath: NSIndexPath!) { 2 cell.layer.transform = CATransform3DMakeScale(0.1, 0.1, 1) 3 UIView.animateWithDuration(0.25, animations:{cell.layer.transform=CATransform3DMakeScale(1, 1, 1)}) 4 }

?7.UI控件匯總

1 UIViewController 2 UITableViewDataSource 3 UITableViewDelegate 4 UIImageView 5 UILabel 6 UIButton 7 UIProgressView 8 UITableView 9 UITapGestureRecognizer 10 UIImage 11 MediaPlayer

?8.最后把代碼貼出來(lái)以供學(xué)習(xí)

1 import UIKit 2 import MediaPlayer 3 import QuartzCore 4 5 class ViewController: UIViewController ,UITableViewDataSource, UITableViewDelegate, HttpProtocol, ChannelProtocol{ 6 7 @IBOutlet var logo: UIImageView 8 @IBOutlet var timeLabel: UILabel 9 @IBOutlet var buttonNext: UIButton 10 @IBOutlet var progressBar: UIProgressView 11 @IBOutlet var itemLayout: UITableView 12 //開(kāi)始點(diǎn)擊事件 13 @IBOutlet var tap: UITapGestureRecognizer = nil //這里必須為空，否則報(bào)錯(cuò) 14 15 @IBOutlet var playBtn: UIImageView 16 17 18 //to cache the picture of songs 19 var imageCache = Dictionary<String, UIImage>() 20 21 var eHttp:HttpController = HttpController() 22 //主界面 23 var tableData:NSArray = NSArray() 24 //頻道列表 25 var channelData:NSArray = NSArray() 26 //定義一個(gè)播放器 27 var audioPlayer:MPMoviePlayerController = MPMoviePlayerController() 28 29 var timer:NSTimer? 30 31 @IBAction func onTap(sender: UITapGestureRecognizer) { 32 if sender.view == playBtn { 33 playBtn.hidden = true 34 audioPlayer.play() 35 playBtn.removeGestureRecognizer(tap) 36 logo.addGestureRecognizer(tap) 37 } else if sender.view == logo{ 38 playBtn.hidden = false 39 audioPlayer.pause() 40 playBtn.addGestureRecognizer(tap) 41 logo.removeGestureRecognizer(tap) 42 } 43 } 44 45 override func viewDidLoad() { 46 super.viewDidLoad() 47 //視圖加載完之后，獲取數(shù)據(jù) 48 eHttp.delegate = self 49 eHttp.onSearch("http://www.douban.com/j/app/radio/channels") 50 eHttp.onSearch("http://douban.fm/j/mine/playlist?channel=0") 51 progressBar.progress = 0.0 52 logo.addGestureRecognizer(tap) 53 54 } 55 56 override func didReceiveMemoryWarning() { 57 super.didReceiveMemoryWarning() 58 // Dispose of any resources that can be recreated. 59 } 60 61 62 func tableView(tableView: UITableView!, willDisplayCell cell: UITableViewCell!, forRowAtIndexPath indexPath: NSIndexPath!) { 63 cell.layer.transform = CATransform3DMakeScale(0.1, 0.1, 1) 64 UIView.animateWithDuration(0.25, animations:{cell.layer.transform=CATransform3DMakeScale(1, 1, 1)}) 65 } 66 67 68 69 //TODO 70 override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) { 71 var channelC:ChannelController = segue.destinationViewController as ChannelController 72 channelC.delegate = self// What TODO 73 channelC.channelData = self.channelData 74 } 75 76 func onChangeChannel(channelId:String) { 77 let url:String = "http://douban.fm/j/mine/playlist?\(channelId)" 78 eHttp.onSearch(url) 79 } 80 81 func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int { 82 return tableData.count 83 } 84 //列表展示 85 func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! { 86 let cell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "songs") 87 let rowData:NSDictionary = self.tableData[indexPath.row] as NSDictionary 88 cell.text = rowData["title"] as String 89 cell.detailTextLabel.text = rowData["artist"] as String 90 //默認(rèn)圖片 91 cell.image = UIImage(named:"detail.jpg") 92 //縮略圖 93 let url = rowData["picture"] as String 94 let image = self.imageCache[url] as? UIImage 95 if !image?{// why do this 96 let imgURL:NSURL = NSURL(string:url) 97 let request:NSURLRequest = NSURLRequest(URL:imgURL) 98 NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response:NSURLResponse!, data:NSData!, error:NSError!) -> Void in 99 let img = UIImage(data:data) 100 cell.image = img 101 //緩存圖片 102 self.imageCache[url] = img 103 }) 104 } else {// if no this else, the item will be default image 105 cell.image = image 106 } 107 108 return cell 109 } 110 111 func didRecieveResults(results:NSDictionary) { 112 //println(results); 113 if(results["channels"]) { 114 self.channelData = results["channels"] as NSArray 115 //self.itemLayout.reloadData() 116 } else if(results["song"]) { 117 self.tableData = results["song"] as NSArray 118 self.itemLayout.reloadData() 119 120 let firDict:NSDictionary = self.tableData[0] as NSDictionary 121 let audioUrl:String = firDict["url"] as String 122 onSetAudio(audioUrl) 123 let imgUrl:String = firDict["picture"] as String 124 onSetImage(imgUrl) 125 } 126 127 } 128 129 130 131 func tableView(tableView:UITableView!, didSelectRowAtIndexPath indexPath:NSIndexPath!) { 132 let rowData:NSDictionary = self.tableData[indexPath.row] as NSDictionary 133 let audioUrl:String = rowData["url"] as String 134 onSetAudio(audioUrl) 135 let imgUrl:String = rowData["picture"] as String 136 onSetImage(imgUrl) 137 } 138 139 140 //設(shè)置音樂(lè) 141 func onSetAudio(url:String) { 142 timer?.invalidate() 143 timeLabel.text = "00:00" 144 145 self.audioPlayer.stop() 146 self.audioPlayer.contentURL = NSURL(string:url) 147 self.audioPlayer.play() 148 timer = NSTimer.scheduledTimerWithTimeInterval(0.4 , target : self, selector : "onUpdate", userInfo: nil, repeats :true) 149 150 playBtn.removeGestureRecognizer(tap) 151 logo.addGestureRecognizer(tap) 152 playBtn.hidden = true 153 } 154 155 func onUpdate() { 156 let c = audioPlayer.currentPlaybackTime 157 if c > 0.0 { 158 let t = audioPlayer.duration 159 let p:CFloat=CFloat(c/t) 160 161 progressBar.setProgress(p, animated: true) 162 163 let allSecond:Int = Int(c) 164 let s:Int = allSecond%60 165 let m:Int = Int(allSecond/60) 166 var time:String = "" 167 if(m < 10) { 168 time = "0\(m)" 169 } else { 170 time = "\(m)" 171 } 172 if(s < 10) { 173 time += ":0\(s)" 174 } else { 175 time += ":\(s)" 176 } 177 timeLabel.text = time 178 179 } 180 } 181 182 183 //設(shè)置圖片 184 func onSetImage(url:String) { 185 let image = self.imageCache[url] as? UIImage 186 if !image?{// why do this 187 let imgURL:NSURL = NSURL(string:url) 188 let request:NSURLRequest = NSURLRequest(URL:imgURL) 189 NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response:NSURLResponse!, data:NSData!, error:NSError!) -> Void in 190 let img = UIImage(data:data) 191 self.logo.image = img 192 //緩存圖片 193 self.imageCache[url] = img 194 }) 195 } else {// if no this else, the item will be default image 196 self.logo.image = image 197 } 198 199 } 200 201 }

?

1 import UIKit 2 3 4 protocol HttpProtocol { 5 func didRecieveResults(results:NSDictionary) 6 } 7 8 class HttpController : NSObject { 9 10 var delegate:HttpProtocol? 11 12 func onSearch(url:String) { 13 var nsUrl:NSURL = NSURL(string:url) 14 var request:NSURLRequest = NSURLRequest(URL:nsUrl) 15 //1.Closure Expression Syntax 16 //2.異步獲取數(shù)據(jù) 17 18 NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler:{(response:NSURLResponse!, data:NSData!, error:NSError!)->Void in 19 var jsonResult:NSDictionary = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary 20 //why just miss an excalmatory mark, the code isn't compile 21 //self.delegate?.didRecieveResults(jsonResult) 22 }) 23 } 24 }

?

1 import UIKit 2 import QuartzCore 3 4 protocol ChannelProtocol { 5 func onChangeChannel(channelId:String)// why is String, is not NSString 6 } 7 8 class ChannelController: UIViewController, UITableViewDataSource, UITableViewDelegate { 9 10 @IBOutlet var listLayout: UITableView 11 12 var channelData:NSArray = NSArray() 13 var delegate:ChannelProtocol? 14 15 override func viewDidLoad() { 16 super.viewDidLoad() 17 // Do any additional setup after loading the view, typically from a nib. 18 } 19 20 override func didReceiveMemoryWarning() { 21 super.didReceiveMemoryWarning() 22 // Dispose of any resources that can be recreated. 23 } 24 25 26 func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int { 27 return 10 28 } 29 30 func tableView(tableView: UITableView!, willDisplayCell cell: UITableViewCell!, forRowAtIndexPath indexPath: NSIndexPath!) { 31 cell.layer.transform = CATransform3DMakeScale(0.1, 0.1, 1) 32 UIView.animateWithDuration(0.25, animations:{cell.layer.transform=CATransform3DMakeScale(1, 1, 1)}) 33 } 34 35 func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! { 36 let cell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "channel") 37 let rowData:NSDictionary = self.channelData[indexPath.row] as NSDictionary 38 cell.text = rowData["name"] as String 39 return cell 40 } 41 42 func tableView(tableView:UITableView!, didSelectRowAtIndexPath indexPath:NSIndexPath!) { 43 //what is do this 44 var rowData:NSDictionary = self.channelData[indexPath.row] as NSDictionary 45 let channelId:AnyObject = rowData["channel_id"] as AnyObject 46 let channel:String = "channel=\(channelId)" 47 delegate?.onChangeChannel(channel) 48 self.dismissViewControllerAnimated(true, completion: nil) 49 } 50 51 52 }

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轉(zhuǎn)載于:https://www.cnblogs.com/royi123/p/3980012.html

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