anarchist
发表于 2025-3-25 06:28:49
Image Analysis and Processing IIAlmost every app needs to display and accept data from the user. The simplest way to display data is through a label, but sometimes you need to display data and give the user a way to respond. In that case, you need to use an alert controller.
吸气
发表于 2025-3-25 10:37:00
Xiaotian Yan,Fang Meng,Hongbin ZhaSince the iPhone and iPad come in different screen sizes, every iOS app needs to adapt to these different screen sizes depending on the type of iOS device it’s running on. To define the position and spacing of different user interface objects, you can use constraints.
opportune
发表于 2025-3-25 11:55:56
Danilo Avola,Luigi Cinque,Giuseppe PlacidiOnly the simplest apps consist of a single view such as the Calculator app. Most apps usually need two or more views to display information. While you could create buttons and link them to different views, this can be a clumsy solution. A far better solution is to organize related views together.
绕着哥哥问
发表于 2025-3-25 17:11:01
Martin Horn,Michael R. BertholdLike a Navigation Controller, a Tab Bar Controller also groups related view controllers together. The main difference is that a Navigation Controller can only display view controllers in sequential order. On the other hand, a Tab Bar Controller can jump to another view controller directly.
过于平凡
发表于 2025-3-25 22:24:14
Elisa Ricci,Samuel Rota Bulò,Nicu SebeOne unique way to display the contents of two or more view controllers is through a Page View Controller, which lets users swipe left and right. Each swipe displays a different view controller like swiping through pages in an e-book.
向下五度才偏
发表于 2025-3-26 02:22:58
Understanding iOS Programming,All programming involves the same task of writing commands for a computer to follow. To learn iOS programming, you need to learn three different skills:
连系
发表于 2025-3-26 07:33:08
Using Common User Interface Objects,A user interface must display information to the user. In addition, a user interface must also allow the user to input data such as text or numbers. Finally, a user interface must allow the user to control the app. Displaying data, accepting data, and accepting commands form the heart of any user interface.
nautical
发表于 2025-3-26 09:01:45
Steppers, Sliders, Progress Views, and Activity Indicator Views,Labels, text fields, and buttons are the three most common types of user interface objects, but they aren’t the only ones used to display information, allow input, and allow interaction from the user. Four other user interface objects that can display information, allow input, and allow interaction in different ways include
外表读作
发表于 2025-3-26 14:38:30
Buttons, Switches, and Segmented Controls,Besides displaying data or letting users input data, the second most important purpose of a user interface is to allow users to control an app. At the simplest level, users can use buttons where each button represents a single command. Of course if you want to display multiple options, displaying multiple buttons on the screen can get crowded.
胎儿
发表于 2025-3-26 17:06:19
Touch Gestures,Allowing the user to control an app through buttons, switches, or segmented controls is handy, but all of these controls take up space on the screen. To eliminate the need for extra objects on the user interface, your app can also detect and respond to touch gestures that allow direct manipulation of items displayed on the screen.