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User Interface ObjectsFrom Beginning iPhone 4 Development and The iPhone
Developer’s Cookbook (Chapter 4)
User Interface Elements
Views—visuals, provide canvas, and other interface visual objects.
ViewControllers –provides a way for user to interact with your application. Can send an action (method) to a target (object) when an event (touch or tap) occurs.
Visual Classes
Parent class –UIView ClassAlmost all interface objects
are children of UIView classUIWindow—specialized
container and home for all the views Set screen size Only see one at a time
May have many views within a single window
Visual Quickstart Guide iPhone SDK 3, pg 100
Views that Display Data
UITextView Text box that may be used for
display or user input Limited to single font and font
size
UILabel Read-only text, limited size
UIImageViews Show pictures. Load with UIImage objects May load a sequence of images
rather than single image
Views that Display Data, cont…
UIWebView Display web content (HTML, PDF, etc) May use to present stylized text Support zoom and scroll
MKMapViews Enables maps into application Allow map annotation (MKannotationView
and MKPinAnnotionView)
UIScrollView Display larger than normal content Adds horizontal and/or vertical scrolling Supports zoom
Views for Making Choices
UIAlertViewPop-up windowsMay customize message and buttonsUse when have two to three choices
UIActionSheetMenus that scroll up from bottom of screenServe same function as Alert view.Use when have 4 or more choices
Inputs and Values
UIButtonDisplays a buttonTriggers an event/actionListed as Round Rect
Buttons
UISegmentedControlDisplays a row of equally
sized buttonsBehave as radio buttons
UISwitchOn-off switch display
cont…
UISliderSlider along a horizontal
barSet value for the bar
UIPageControlLets user move between
pages
UITextFieldsOffer single line of text
input
Tables and Pickers
UITableViewScrolling list of choicesOffer rows of information
UIPickerSelect choices by scrolling
individual wheelsUIDatePicker is specialized
picker for dates
Bars
Compact views that extend from one side of screen to the other
Read the Human Interface Guidelines for limits on bar use before you add a specific bar.
UINavigationBar Used for navigation
UITabBar and UISearchBar
UIToolBar Provide a set of actions that act
on current view
Progress and Activity
UIActivityIndicatorViewSpinning wheel while task
is ongoingDoes not state when task
will end
UIProgressViewOffers bar that fills from
left to right
UIView and UIViewControllers
UIView has a visual representation
UIViewControllers have NO visual representationManage viewsLinking views to codeHandle reorientation eventsHandle navigation issues such as switching between
views
UIViewControllers
May be very general to very specific
Introduce functionality without additional programming
Limit or hide direct access to core featuresExample—camera access
Must use UIImagePickerController to snap a photo. Class pre-built GUI and will handle the taking of the photo and saving. After image is saved then pass control back to your application. No direct access to the camera or raw image data.
UIViewController
Parent class of view controllers
Handle reorientation tasks
Set how views look and which subviews are displayed
Handle reaction to views being displayed or dismissed
Handle view changes
UINavigationController
Allow navigate up and down hierarchies
Create navigation bars
Handles push new views and generate back buttons
Handles navigation details and includes a history stack
Other Controllers
UITabBarController
UITableViewController
AddressBookUI.framework--has several controllers that allow access to address book information
UIIMagePickerController—allows access to photo album and to use the camera
MFMailComposeViewcontroller—allows creation of mail message
GKPeerPickerController—provides GUI for discovering and connecting with other iPhones
MPMediaPickerController—media selection GUI
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