12.Swift JSON 和 PList

Swift JSON 和 PList

解析PList

NSJSONSerialization

解析PList

PList文件的Root节点只能是Array或者Dictionary类型。IOS对PList的解析是十分简洁、方便的。由于Root节点只能是Array或者Dictionary类型，所以可以直接用NSArray或者NSDictionary的构造方法就能完成解析。

在NSArray的扩展构造方法中能找到一个便利构造方法
public convenience init?(contentsOfURL url: NSURL)

在NSDictionary的扩展构造方法中能找到一个便利构造方法
public convenience init?(contentsOfURL url: NSURL)

待解析的dictPList.plist

待解析的arrayPList.plist

ViewController.swift

class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. // 解析Root为Array的PList let arrayPList:NSArray = NSArray(contentsOfURL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("arrayPList", ofType: "plist")!))! // 解析Root为Dictionary的PList let dictPList:NSDictionary = NSDictionary(contentsOfURL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("dictPList", ofType: "plist")!))! NSLog("\(arrayPList)") NSLog("\(dictPList)") } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }

如果要生成PList文件的话，同样的办法，将NSArray或者NSDictionary传入NSData的构造方法中，最后调用NSData的writeToFile(path: String, atomically useAuxiliaryFile: Bool) -> Bool。

NSJSONSerialization

IOS提供的NSJSONSerialization，可用于将普通数据转换为JSON格式的NSData、解析JSON文件。当数据通过NSJSONSerialization转换为JSON格式的NSData时，NSData又自带了writeToFile(path: String, atomically useAuxiliaryFile: Bool) -> Bool将自身保存为文件；解析JSON的话，需要NSJSONSerialization的JSONObjectWithData(data: NSData, options opt: NSJSONReadingOptions) throws -> AnyObject方法，将.json文件转换为AnyObject类型，再通过AnyObject的objectForKey(aKey: AnyObject) -> AnyObject?去获取其中的内容。

解析JSON
NSJSONSerialization.JSONObjectWithData(data: NSData, options opt: NSJSONReadingOptions) throws -> AnyObject

生成JSON格式的NSData
NSJSONSerialization.JSONObjectWithData(data: NSData, options opt: NSJSONReadingOptions) throws -> AnyObject

mjson.json

{"name":"CaMnter","sign":"Save you from anything"}

ViewController.swift

class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. self.parseJSON() self.exportJSON() } // 解析JSON文件，生成JSONObject func parseJSON(){ do { // JSONObjectWithData解析JSON文件 let json:AnyObject? = try NSJSONSerialization.JSONObjectWithData(NSData(contentsOfURL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("mjson", ofType: "json")!))!, options: NSJSONReadingOptions.AllowFragments) if let name: AnyObject = json?.objectForKey("name"){ NSLog("\(name)") } if let sign: AnyObject = json?.objectForKey("sign"){ NSLog("\(sign)") } }catch let error as NSError { NSLog("\(error.localizedDescription)") } } // NSData生成JSONObject func exportJSON(){ let dict = ["name":"CaMnter","sign":"Save you from anything"] do{ // dataWithJSONObject生成JSON格式的NSData let jsonData:NSData! = try NSJSONSerialization.dataWithJSONObject(dict, options: NSJSONWritingOptions.PrettyPrinted) let jsonString:NSString = NSString(data: jsonData, encoding: NSUTF8StringEncoding)! NSLog("\(jsonString)") }catch let error as NSError { NSLog("\(error.localizedDescription)") } } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } $(function () { $('pre.prettyprint code').each(function () { var lines = $(this).text().split('\n').length; var $numbering = $('').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i