While you almost never interact with windows on iOS since they take up the whole screen anyway , windows are key components on the Mac. Historically, Mac applications had multiple windows, each with its own role, very similar to view controllers on iOS. But AppKit has changed, since Mac apps are relying more and more on a single window. It is also part of the responder chain by default.
How to Switch to Cocoa Development as a Cocoa Touch Developer
Just remember that if you target your Mac app to OS X As Mike Ash writes , a good pattern to instantiate windows on the Mac is to have one nib file and one window controller per window type. Instead, each window holds a reference to its top-level view in the contentView property. Instead, events will bubble up through the view tree and then go straight to the window and the window controller.
- Understanding Table Views.
- What’s Different.
- macOS NSTableView Tutorial | ypijinelen.ga.
In this instance, if you want a view controller to handle events, you will have to add it to the responder chain manually. In addition to the difference in the responder chain, AppKit also has a stricter convention as to the method signature of actions.
In AppKit, an action method always looks like this:. Furthermore, in AppKit, controls usually hold a reference to one target and an action pair, whereas you can associate multiple target-action pairs with a control on iOS using the addTarget:action:forControlEvents: method. The view system works very differently on the Mac, for historic reasons.
Swift NSTableView – Different Approaches Sample Code – Knowledge Stack
On iOS, views were backed by Core Animation layers by default from the beginning. But AppKit predates Core Animation by decades. Therefore, the view system heavily relied on the CPU doing the work. By default, AppKit views are not backed by Core Animation layers; layer-backing support has been integrated into AppKit retroactively.
AppKit differentiates between layer-backed and layer-hosting views, and layer backing can be turned on and off on a per-view-tree basis. In contrast to iOS, on the Mac you should treat the backing layers as an implementation detail. This means you should not try to interact with the layers directly, as AppKit owns those layers.
For example, on iOS you could simply say:. If you want to interact with the layer in such ways, then you have to go one step further. Instead, updateLayer will be called during the view update cycle, and this is where you can modify the layer. You can use this, for example, to implement a very simple view with a uniform background color yes, NSView has no backgroundColor property :. The alternative to this would be to simply override the drawRect: method to draw the colored background. Since OS X This can be a good option if you know that you will not need to animate subviews individually.
All subviews that are implicitly layer-backed i. However, subviews that do have wantsLayer set to YES will still have their own backing layer and their drawRect: method will be called, no matter what wantsUpdateLayer returns. This resembles the behavior of non-layer-backed views, but it might be detrimental to animation performance if a drawing step is introduced for each frame of the animation. This way, you have control over when the layer contents need to be redrawn.
Creating the Table View
A frame change will not automatically trigger a redraw anymore; you are now responsible for triggering it by calling -setNeedsDisplay:. This allows you to specify how the existing layer content will be mapped into the layer as it is resized. There is a whole different option to work with Core Animation layers — called layer-hosting views. In short, with a layer-hosting view, you can do with the layer and its sublayers whatever you want. The price you pay for this is that you cannot add any subviews to this view anymore. A layer-hosting view is a leaf node in the view tree. To create a layer-hosting view, you first have to assign a layer object to the layer property, and then set the wantsLayer to YES.
Note that the sequence of these steps is crucial:. In order to receive events for the mouse cursor entering or exiting the view or being moved within the view, you need to create a tracking area. A common pattern looks like this:. AppKit controls have been traditionally backed by NSCell subclasses. These cells should not be confused with table view cells or collection view cells in UIKit. AppKit originally made the distinction between views and cells in order to save resources — views would delegate all their drawing to a more lightweight cell object that could be reused for all views of the same type.
Check out the Cocoa Drawing Guide for more details. As a consequence of the differences in the view system discussed above, animations also work quite differently on the Mac. I could make it work with valueForKeyPath: but that made my skin crawl as it should. Unfortunately for me, the next stop was AppleScript. Which was quite weird and dynamic and surprise! No documentation worth noting besides a few examples and an entire internet of people asking how to do a great deal many specific tasks except the one I needed.
There are a lot of really good frameworks and tools in Cocoa that extend the functionality of Cocoa Touch. The assumption that an iOS developer already knows Mac development is a dangerous one for anyone on the project team to have. We can minimize risk while migrating or developing a new OSX app from scratch by avoiding assumptions about Cocoa based on Cocoa Touch knowledge, and avoid outdated documentation and research topics extensively before committing to a solution.
We can be a part of the solution by contributing to the community; let your struggles in the dark light the way for the developers that follow you. Jenelle is a mobile developer with experience in developing iOS applications and with web technologies for mobile and large, touchscreen kiosks. She has two degrees from Georgia Institute of Technology; a B.
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LinkedIn Twitter. Jenelle Walker Jenelle is a mobile developer with experience in developing iOS applications and with web technologies for mobile and large, touchscreen kiosks.
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