iOS开发——项目实战Swift篇&swift 2.0项目开发总结一（开发常用）

 1 let versionStr = "CFBundleShortVersionString"
 2     let cureentVersion = NSBundle.mainBundle().infoDictionary![versionStr] as! String
 3     let oldVersion = (NSUserDefaults.standardUserDefaults().objectForKey(versionStr) as? String) ?? ""
 4 
 5     if cureentVersion.compare(oldVersion) == NSComparisonResult.OrderedDescending {
 6     NSUserDefaults.standardUserDefaults().setObject(cureentVersion, forKey: versionStr)
 7     NSUserDefaults.standardUserDefaults().synchronize()
 8     return LeadpageViewController()
 9     }
10  

 1 if self.childViewControllers.count > 0 {
 2       let vc = self.childViewControllers[0]
 3 
 4       if self.childViewControllers.count == 1 {
 5           backBtn.setTitle(vc.tabBarItem.title!, forState: .Normal)
 6       } else {
 7           backBtn.setTitle("返回", forState: .Normal)
 8       }
 9 
10       viewController.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: backBtn)
11       viewController.hidesBottomBarWhenPushed = true
12   }
13 
14   super.pushViewController(viewController, animated: animated)
15  
16