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…

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…

本文转载至 http://www.xuebuyuan.com/2117943.html Presenting view controllers on detached view controllers is discouraged <UINavigationController: 0x14642710>.的解决方法: [self.view.window.rootViewControllerpresentViewController:controlleranimated:YEScompletio…

遇到这个警告后找了一下网络资源,基本上只说通过 [self.view.window.rootViewController presentViewController:controller animated:YEScompletion:nil]; 可以消除该警告,但是我是不满足于仅仅消除警告的,得搞清楚怎么会出现这个.于是在 stackoverflow 上看到一条回答 应该就是这个原因了,于是从头找起,由于使用了IIViewController这个作为逻辑上的根控制器,而程序实际的根控制器是模版自…

原因: 是某个viewController的生命周期控制出现了错误,所以尽量避免一个controller的view去addsubview另一个controller的view,这样会破坏层级关系,导致第一controller不能控制另一个controller的生命周期. 解决办法: 在presentViewController,需要添加 [mainVC addChildViewController:VC]; //先添加到主控制器 [self addChildViewController:vc];…

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…

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…

About View Controllers View controllers are a vital link between an app’s data and its visual appearance. Whenever an iOS app displays a user interface, the displayed content is managed by a view controller or a group of view controllers coordinating…

iOS Programming View Controllers  视图控制器  1.1  A view controller is an instance of a subclass of UIViewController. 一个view controller 是一个UIViewController的子类. A view controller manages a view hierarchy. 一个view controller 管理一个视图树. It is responsible for c…

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…