Swift之沙盒与数据存储
应用沙盒结构分析
1、应用程序包:包含了所有的资源文件和可执行文件
2、Documents:保存应用运行时生成的需要持久化的数据,iTunes同步设备时会备份该目录
3、tmp:保存应用运行时所需要的临时数据,使用完毕后再将相应的文件从该目录删除。应用没有运行,系统也可能会清除该目录下的文件,iTunes不会同步备份该目录
4、Library/Cache:保存应用运行时生成的需要持久化的数据,iTunes同步设备时不备份该目录。一般存放体积大、不需要备份的非重要数据
5、Library/Preference:保存应用的所有偏好设置,IOS的Settings应用会在该目录中查找应用的设置信息。iTunes同步设备时会备份该目录
IOS中的数据存储
1、存储为plist属性列表
func saveWithFile() { /// 1、获得沙盒的根路径 let home = NSHomeDirectory() as NSString; /// 2、获得Documents路径,使用NSString对象的stringByAppendingPathComponent()方法拼接路径 let docPath = home.stringByAppendingPathComponent("Documents") as NSString; /// 3、获取文本文件路径 let filePath = docPath.stringByAppendingPathComponent("data.plist"); var dataSource = NSMutableArray(); dataSource.addObject("衣带渐宽终不悔"); dataSource.addObject("为伊消得人憔悴"); dataSource.addObject("故国不堪回首明月中"); dataSource.addObject("人生若只如初见"); dataSource.addObject("暮然回首,那人却在灯火阑珊处"); // 4、将数据写入文件中 dataSource.writeToFile(filePath, atomically: true); println("/(filePath)"); }
func readWithFile() { /// 1、获得沙盒的根路径 let home = NSHomeDirectory() as NSString; /// 2、获得Documents路径,使用NSString对象的stringByAppendingPathComponent()方法拼接路径 let docPath = home.stringByAppendingPathComponent("Documents") as NSString; /// 3、获取文本文件路径 let filePath = docPath.stringByAppendingPathComponent("data.plist"); let dataSource = NSArray(contentsOfFile: filePath); println("/(dataSource)"); }
2、使用NSUserDefaults存储数据
func saveWithNSUserDefaults() { /// 1、利用NSUserDefaults存储数据 let defaults = NSUserDefaults.standardUserDefaults(); // 2、存储数据 defaults.setObject("衣带渐宽终不悔", forKey: "name"); // 3、同步数据 defaults.synchronize(); }
func readWithNSUserDefaults() { let defaults = NSUserDefaults.standardUserDefaults(); let name = defaults.objectForKey("name") as NSString; println("/(name)"); }
3、归档存储:对象需要实现NSCoding协议,归档对应encode,反归档对应decode
/** 归档数据 需要实现NSCoding协议 */ func saveWithNSKeyedArchiver() { let home = NSHomeDirectory() as NSString; let docPath = home.stringByAppendingPathComponent("Documents") as NSString; let filePath = docPath.stringByAppendingPathComponent("book.data"); let book = CFAddressBook(name: "Francis", call: "199"); /** * 数据归档处理 */ NSKeyedArchiver.archiveRootObject(book, toFile: filePath); }
/** 反归档数据 */ func readWithNSKeyedUnarchiver() { let home = NSHomeDirectory() as NSString; let docPath = home.stringByAppendingPathComponent("Documents") as NSString; let filePath = docPath.stringByAppendingPathComponent("book.data"); let book = NSKeyedUnarchiver.unarchiveObjectWithFile(filePath) as CFAddressBook; println("/(book.name), /(book.call)"); }
4、SQlite3
5、CoreData