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An enumeration that not only contains the available filters provided in the app, but it also has code related to the them, such as creating the actual CIFilter, getting the parameter names for those filters that need user input, the range of acceptable values of the parameters, and a few more. It implements a few class methods that help in loading an image from and saving back to disk, getting the image size and performing resizing.
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In addition, there are two auxiliary files that contain: The respective ViewModel implementations are contained in the ImageEditorViewModel and ResizeViewModel classes, while the models are the ImageInfo and ImageSize (quite simple) structs. The project contains two view controllers: ImageEditorViewController and ResizeViewController. Note: If you need to read about MVVM in Swift, here is a great tutorial to do so. There is a starter project to download, as most of the business logic has been implemented already. It is going to be capable of letting us open any image from the disk, apply four image filters, resize and save back to disk as a new file. The demo app that we will focus on today is a light image editor. Then we’ll jump straight into the new stuff we have to learn here today. Let’s get started, and let’s have a quick look of the demo app that we’ll be working on.
#MAKE A MAC OS PROGRAM HOW TO#
How to handle a custom window as a sheet.How to show Alerts with different kind of content in them.
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How to present a Save Panel to do the exact opposite and store a file anywhere on the disk.How to present an Open Panel and let users open files of specific types (files with specific extensions).I would recommend to take a look at the Apple’s Human Interface Guidelines about dialogs, alerts and sheets. The common thing with the modal presentation is that the new window stays there until we dismiss it, and it doesn’t allow interaction with any other content underneath. Instead, the new window is sliding in from the top of the current window and looks like it’s a part of it. When presenting a window as a sheet, then there’s no separate window and no dragging can happen. There is a title bar and window can be dragged around in the screen. When presenting as a modal dialog, the new window sits on top of the current window and interaction is allowed with that only. Presenting any of the above can happen in two different ways: Either as a modal dialog, or as a sheet. You can start with the first tutorial if you’re new to macOS app development. Editor’s note: This is the third article of our macOS Programming tutorial series.