Android引导页

Gudie引导页，判断版号privatefunctoNewFeature()->Bool{//根据版本号来确定是否进入新特性界面letcurrentVersion=NSBundle.mainBundle().infoDictionary!["CFBundleShortVersionString"]as!StringletoldVersion=NSUserDefaults.standardUserDefaults().objectForKey(XCBundleShortVersionString)??""