Category Archives: ios uiview

Ios uiview

Views define a portion of a window that you want to fill with some content. For example, you might have views that display images, text, shapes, or some combination thereof.

You can also use views to organize and manage other views. Every application has at least one window and one view for presenting its content. UIKit and other system frameworks provide predefined views that you can use to present your content. These views range from simple buttons and text labels to more complex views such as table views, picker views, and scroll views.

In places where the predefined views do not provide what you need, you can also define custom views and manage the drawing and event handling yourself. A view is an instance of the UIView class or one of its subclasses and manages a rectangular area in your application window.

Views are responsible for drawing content, handling multitouch events, and managing the layout of any subviews. A view responds to touch events in its rectangular area either by using gesture recognizers or by handling touch events directly.

In the view hierarchy, parent views are responsible for positioning and sizing their child views and can do so dynamically. This ability to modify child views dynamically lets your views adjust to changing conditions, such as interface rotations and animations.

You can think of views as building blocks that you use to construct your user interface. Rather than use one view to present all of your content, you often use several views to build a view hierarchy.

Each view in the hierarchy presents a particular portion of your user interface and is generally optimized for a specific type of content. For example, UIKit has views specifically for presenting images, text and other types of content. Windows work with views and their owning view controllers to manage interactions with, and changes to, the visible view hierarchy. After the window is created, it stays the same and only the views displayed by it change. If an external display is connected to the device, applications can create a second window to present content on that screen as well.

Animations provide users with visible feedback about changes to your view hierarchy. The system defines standard animations for presenting modal views and transitioning between different groups of views. However, many attributes of a view can also be animated directly.

For example, through animation you can change the transparency of a view, its position on the screen, its size, its background color, or other attributes. Using Interface Builder, you assemble your views and place them in a nib filewhich is a resource file that stores a freeze-dried version of your views and other objects.

When you load a nib file at runtime, the objects inside it are reconstituted into actual objects that your code can then manipulate programmatically.

Because views are very sophisticated and flexible objects, it would be impossible to cover all of their behaviors in one document. However, other documents are available to help you learn about other aspects of managing views and your user interface as a whole. A view controller presides over all of the views in a single view hierarchy and facilitates the presentation of those views on the screen.

Views are the key recipients of gesture and touch events in your application. For more information about using gesture recognizers and handling touch events directly, see Event Handling Guide for iOS.

Custom views must use the available drawing technologies to render their content. For information about using these technologies to draw within your views, see Drawing and Printing Guide for iOS.

In places where the standard view animations are not sufficient, you can use Core Animation. All Rights Reserved.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

This subview has corners which aren't rounded. How can I make them round? Note: If you are trying to apply rounded corners to a UIViewController 's view, it should not be applied in the view controller's constructor, but rather in -viewDidLoadafter view is actually instantiated. You can also use the User Defined Runtime Attributes feature of interface builder to set the key path layer. Make sure you include the QuartzCore library though.

This trick also works for setting layer. You will not be able to see the effects in the storyboard because these parameters are evaluated at runtime. Now you can use a swift category in UIView code bellow the picture in with IBInspectable to show the result at the storyboard If you are using the category, use only cornerRadius and not layer.

If you have come to this answer, you have probably already seen enough to solve your problem. I'm adding this answer to give a bit more visual explanation for why things do what they do. You can give it round corners by changing the cornerRadius property of the view's layer.

This might be enough to solve your problem right there. However, sometimes a view can have a subview or a sublayer that goes outside of the view's bounds. For example, if I were to add a sub view like this. Both clipsToBounds and masksToBounds are equivalent.

ios uiview

As described in this blog posthere is a method to round the corners of a UIView:. You can use following custom UIView class which can also change border color and width.

ios uiview

As this is IBDesignalbe You can change the attributes in interface builder as well. For example of this question:. Note that there is no more diamond like radius, so even if you set the cornerRadius more than half of the heightit will round smoothly. Learn more. Asked 10 years, 7 months ago. Active 30 days ago. Viewed k times. Is there any way to do it inside my xib?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Below is a gif showing the behavior I am encountering: when I click the cyan button on the right, nothing happens the background of the view on the left is supposed to change color.

When I click the green button on the left, it correctly receives the touch event, the attached TouchDown action fires and the color of the view changes. This "app" is obviously not a real app and is just meant to illustrate the behavior I'm encountering. Really what I'm after is learning how to implement the common "slide out menu" pattern that you see in many apps; usually with an accompanying hamburger button.

In many of these apps, it looks like the main application content is moved aside to reveal the menu, "hiding" underneath the app, as it were. I am trying to replicate that same behavior here. Any portion of subview that is outside of its superview 's bounds won't receive touch events. Touch events will only be passed along and recognized by portions of the subview that are within the bounds of its superview This is why your cyan button won't "fire" when you tap it.

One way to solve it is instead of manipulating the view 's frame, use a secondary subview call it overlayView to overlay and cover the containerViewand manipulate its frame. Make sure at least some portion both views are within the bounds of the main view so they may receive touch events.

You need to keep the main view large enough to receive events. Use self. However, this is an odd and fragile solution to whatever you're trying to do. You should not be shifting the frame of the main view. That has to remain covering the entire UIWindownothing more, nothing less. And think about why you want to move your central control buttons, and your central label, making an unusably 'jumpy' interface.

One fragility is doing layout calculations in viewDidLoadwhich is too early in the ViewController lifecycle. See: wrong frame size in viewDidLoad. The right way is a good bit more work: constrain a custom UIView subclass to fill your main view, and then if you must do non-Storyboard in-code layout calculations, do that within an overridden layoutSubviews method of that custom subclass -- at which point correct geometry is available.

Things get a lot easier if your main view needn't move.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to convert a UIView to an image and save it in my app. Can someone please tell me how to take screenshot of a view or convert it to an image and what is the best way to save it in an app Not camera roll?

Here is the code for the view:. Check out WWDC16 session for more details image rendering begins around the mark. To be sure that it works on every device, use available with a fallback to earlier versions of iOS:. For example if I have a view of size: 50 50 atI can use the following to take a screenshot:.

I implemented Naveed J. For view contains blurred subview e. ViJay Avhad's answer is correct for this case. Learn more. Asked 4 years, 11 months ago. Active 2 months ago. Viewed 73k times.

Sameer Hussain Sameer Hussain 1, 5 5 gold badges 17 17 silver badges 34 34 bronze badges. Also relevant: stackoverflow. Active Oldest Votes. An extension on UIView should do the trick.

John Montgomery 4, 7 7 gold badges 30 30 silver badges 50 50 bronze badges. Naveed J. This should be marked as the correct answer.The UIView class is a rectangular area on the screen that is responsible for displaying content and handling user interactions with that content.

It can also contain other views, allowing the developer to create complex interactive controls. UIView can thus be used as either a standalone control, or as a full screen of content built from many other independent UIViews. UIViews can handle touch events in two ways.

View Programming Guide for iOS

Developers use the high-level gesture recognizer API to detect and handle gestures, or roll their own event handling by using the low-level interface that provides detailed touch events as they happen: every time a finger touches the screen or is lifted as well as motion of those fingers.

Both are covered below. Event delivery can be turned off either by setting the UserInteractionEnabled to false or you can disable them temporarily at the application level by calling BeginIgnoringInteractionEvents. In both cases, events destined for the view are dropped and are not delivered to the views.

Events are disabled while animation are playing back. Interacting with touch interfaces has lead to a series of common gesture idioms that are used everywhere. Gestures like swiping, panning, long-presses, pinching rotating and tapping. These are objects that inherit from the UIGestureRecognizer class and can detect various standard gesture idioms.

The built-in recognizers include:. In addition, developers can create their own custom gesture recognizer by subclassing UIGestureRecognizer. Developers use the recognizer by creating an instance of the specific kind of recognizer that is needed, optionally setting some parameters, and adding it to the view by calling AddGestureRecognizer.

ios uiview

It is possible to attach multiple gesture recognizers to a single view. For example, the following code creates a gesture recognizer that detects a panning gesture and assigns it to myView:.

AddGestureRecognizer recognizer ; The parameter passed to the lambda the "g" parameter in the above code is an instance of the gesture recognizer that detected the gesture. The developr can query the parameters of the recognized query by looking at the properties in the recognizer; the State property contains the recognizer state. Although Gesture Recognizers provide a high-level and convenient way of capturing many touch events, they do not cover every possibility.

For those cases, developers should subclass UIView and override one or more of the following methods inherited from UIResponder:. UIViews by default only handle a single touch event at once. If you want your view to handle multiple touches, you must set the MultipleTouchEnabled to true. The UIEvent encapsulates all of the touches that are taking place on the screen at this point, even those that do not belong to this view.

UIViews are typically created by invoking the constructor that takes a frame as its parameter the frame is of type RectangleFfor example:. The section below on subclassing UIView has more information on how to do this. The developer should configure the AutoresizingMask property, which determines how the view will be resized when SetNeedsLayout is invoked or when the geometry of the view container changes for example, in response to a device rotation.Views are the fundamental building blocks of your app's user interface, and the UIView class defines the behaviors that are common to all views.

A view object renders content within its bounds rectangle and handles any interactions with that content. The UIView class is a concrete class that you can instantiate and use to display a fixed background color. You can also subclass it to draw more sophisticated content.

UIView Class

To display labels, images, buttons, and other interface elements commonly found in apps, use the view subclasses provided by the UIKit framework rather than trying to define your own. Because view objects are the main way your application interacts with the user, they have a number of responsibilities. Here are just a few:. Use Auto Layout to define the rules for resizing and repositioning your views in response to changes in the view hierarchy. A view is a subclass of UIResponder and can respond to touches and other types of events.

Views can be nested inside other views to create view hierarchies, which offer a convenient way to organize related content. Nesting a view creates a parent-child relationship between the child view being nested known as the subview and the parent known as the superview.

A parent view may contain any number of subviews but each subview has only one superview. Use the clips To Bounds property to change that behavior. The geometry of each view is defined by its frame and bounds properties. The frame property defines the origin and dimensions of the view in the coordinate system of its superview. The bounds property defines the internal dimensions of the view as it sees them and is used almost exclusively in custom drawing code.

The center property provides a convenient way to reposition a view without changing its frame or bounds properties directly. Normally, you create views in your storyboards by dragging them from the library to your canvas.

You can also create views programmatically. When creating a view, you typically specify its initial size and position relative to its future superview. For example, the following example creates a view and places its top-left corner at the point 10, 10 in the superview's coordinate system once it is added to that superview.

You may add any number of subviews to a view, and sibling views may overlap each other without any issues in iOS. You can also exchange the position of already added subviews using the exchange Subview at: with Subview At: method.

After creating a view, create Auto Layout rules to govern how the size and position of the view change in response to changes in the rest of the view hierarchy. For more information, see Auto Layout Guide. View drawing occurs on an as-needed basis. When a view is first shown, or when all or part of it becomes visible due to layout changes, the system asks the view to draw its contents.

When the actual content of your view changes, it is your responsibility to notify the system that your view needs to be redrawn.

These methods let the system know that it should update the view during the next drawing cycle. Because it waits until the next drawing cycle to update the view, you can call these methods on multiple views to update them at the same time.

Subscribe to RSS

For detailed information about the view drawing cycle and the role your views have in this cycle, see View Programming Guide for iOS. Changes to several view properties can be animated—that is, changing the property creates an animation starting at the current value and ending at the new value that you specify. The following properties of the UIView class are animatable:. To animate your changes, create a UIView Property Animator object and use its handler block to change the values of your view's properties.

The UIView Property Animator class lets you specify the duration and timing of your animations, but it performs the actual animations. You can pause a property-based animator that is currently running to interrupt the animation and drive it interactively.The host mode support means that UI-View can be used with a wide range of packet hardware and allows up to 16 RF ports to be used. UI-View uses bitmap images for its maps. Download PMapServer.

Precision Mapping 8 could use PMapServer 7. With open architecture, UI-View is designed to make it easy for software authors to write add-on applications that provide additional functionality.

The 16 bit version will work on Windows 3. It is supplied as "registration-ware". An unregistered copy is almost fully functional. See the registration link below. It is for registered users only, and has many extra features compared to UI-View If you are unfamiliar with UI-View32, you can try UI-View 16but unless your hardware doesn't meet the minimum specs for UI-View32, the 32 bit version is recommended.

If you run it on anything less than that, then it will be very slow. Don't expect to be able to run PMapServer7 on a P Undertow's own "minimum spec" is for a MHz Pentium, but you will get better performance by running it on a more capable machine. A MHz machine will run PMapServer7 a lot more smoothly than one that only just meets the minimum requirements.

It will run fine on Windows Vista, Windows 7, Windows 8. The amateur radio community lost a great friend on that day. He will be remembered as a true ham. Most of us only knew him through the UI-View support group, but some UI-View users were fortunate enough to have met him. He was ever-present on the list answering questions that had usually been asked before, but always courteous and always helpful.

Even in the middle of the night, he often posted replies. He leaves behind a legacy that will be useful to thousands of hams world-wide for years to come, and his loving wife Dee, his son Steven and his daughter Kate. Please ignore the registration instructions in the UI-View Help. Enter your callsign and name and then click on the registrar that lives the closest to you. WinPack can be downloaded from Andy's site. The old WinPack site www. UI-View v2. If you are using the 16 bit UI-View v2.

If you are using a version of UI-View earlier than v2. Unless there is a reason to use the older 16 bit version, choose UI-View32 v2. A few screenshots can be viewed here on this site. It is supplied as a single file, self-extracting installer 32full UI-View32 V2. TXT for details of all the changes that have been made since V1. User Access Control. The operating system doesn't like programs writing to files below Program Files.

UI-View saves settings in the file uiview


thoughts on “Ios uiview

Leave a Reply

Your email address will not be published. Required fields are marked *