在这一课中,你会继续在FoodTracker菜谱的场景工作.你会重新安排现有的UI元素并使用图像采集器添加到照片用户界面.当你完成,你的应用程序将是这个样子: 学习目标 在课程结束时,你将能够: 了解视图控制器的生命周期,如viewDidLoad,viewWillAppear和viewDidAppear这些回调函数在视图控制器之间传递数据让一个视图控制器消失使用手势识别生成一个事件预测的基于UIView/ UIControl类层次的对象行为使用asset目录,添加图像资源到项目中 理解视图控制器…

Resource Management in View Controllers 视图控制器的资源管理 View controllers are an essential part of managing your app’s resources. View controllers allow you to break your app up into multiple parts and instantiate only the parts that are needed. But more t…

Creating Custom Content View Controllers 自定义内容视图控制器 Custom content view controllers are the heart of your app. You use them to present your app’s unique content. All apps need at least one custom content view controller. Complex apps divide the workl…

iOS Programming Autorotation, Popover Controllers, and Modal View Controllers  自动旋转,Popover 控制器,Modal view controller  1.  In this chapter, you are going to make four changes to Homepwner's behavior that will tailor the app's behavior to whatever dev…

Resource Management in View Controllers View controllers are an essential part of managing your app’s resources. View controllers allow you to break your app up into multiple parts and instantiate only the parts that are needed. But more than that, a…

Creating Custom Content View Controllers 创建自定义内容视图控制器 Custom content view controllers are the heart of your app. You use them to present your app’s unique content. All apps need at least one custom content view controller. Complex apps divide the wor…

今天在优化app时,发现程序出现这种警告:“ Presenting view controllers on detached view controllers is discouraged <CallViewController: 0x14676e240>. ” 首先说明一下,我是在判断无网络时,要弹出一个提示框时出现的这个问题 在网上查资料时,又说是当前控制器已present一个视图,再present一个视图时,就会出现这个错误.但是在我的项目中当前页面根本就没有第二个present了,因此…

iew controllers 通常是 iOS 项目中最大的文件,并且它们包含了许多不必要的代码.所以 View controllers 中的代码几乎总是复用率最低的.我们将会看到给 view controllers 瘦身的技术,让代码变得可以复用,以及把代码移动到更合适的地方. 你可以在 Github 上获取关于这个问题的示例项目. 把 Data Source 和其他 Protocols 分离出来 把 UITableViewDataSource 的代码提取出来放到一个单独的类中,是为 view…

参考:http://www.cnblogs.com/patientAndPersist/p/3279645.html Using View Controllers in Your App Whether you are working with view controllers provided by iOS, or with custom controllers you’ve created to show your app’s content, you use a similar set o…

Assigning View Controller Class In the first tutorial, we simply create a view controller that serves as the detail view of recipe in the Storyboard editor. The view controller is assigned with the UIViewController class by default. Default View Cont…