Another interesting point is the object hierarchy and the actual contained objects in the Document Outline pane. One would expect to find there only the popup buttons, the label and the push button along with their constraints. However, if you start expanding the objects tree you will notice that there are more objects than those we specifically added. Apart from the menu items of the popups which is fine to be found there since a menu item is actually another Cocoa control created automatically , you will also find a cell object going in pair with each control. All those subclasses inherit from the same ancestor, NSCell , which implements several common properties and methods regarding the appearance and behaviour of controls.
Even though we will be interacting with the popup buttons, the label and the push button objects directly in this app, behind the scenes any visual changes and updates will be handled by the matching cell subclasses.
Just one general warning: make sure to connect IBOutlet properties to the actual controls and not their cell counterparts. In the first two lines we remove all default items from the two popup buttons. In the other two lines we empty the default text of the label, and we center it. Next step is to populate the first popup button with actual values: All font families existing in the Mac.
We will achieve that by getting to know a new class called NSFontManager. It is responsible for several things including the Font panel and Font menu found in many apps, keeping record of the currently selected font, triggering font changes, and more. NSFontManager is used through a shared instance programmatically.
A property named availableFontFamilies can give us what we need: A collection array with all the available font families! Right next we define a new method that uses the NSFontManager class and adds the found family names as items to the fontFamiliesPopup :. Now, both of methods we implemented above have to be called once the app is started, and before the view gets appeared.
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Go right after the viewDidLoad method and add the following:. Run the app and open the first popup, you will find all available font families in it! NSFontManager class seems to be quite useful, as there are more interesting properties and methods to explore and use. One such method that is particularly interesting is called availableMembers ofFontFamily:.
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It returns an array where each item is another array [[Any]] with four distinct values:. An item-array is called a member of the font family. The following example taken from Apple Documentation illustrates what availableMembers ofFontFamily: returns:. Putting the above in different words, with availableMembers ofFontFamily: we can get all font variations that a font family supports, and display them on the fontTypesPopup popup button.
What we need to do now is to make it possible to keep the selected font family and get its contained members every time the fontFamiliesPopup selection gets changed. At first, we get the title of the item that gets selected in the fontFamiliesPopup ; it matches to the font family name. We keep it in the selectedFontFamily property. Next, we get all available members of the selected font family using the availableMembers ofFontFamily: method of the NSFontManager class. Those members are kept in the fontFamilyMembers class property. However, just keeping the selected font family name and its members makes no real difference.
We need to populate them to the fontTypesPopup so we see and use the font variations of each family. Add the next one to the ViewController class:. You might want to run the app now and see the available font variations after having selected a font family first. Do it, and soon enough you will end up to an unpleasant result: The fontTypesPopup does not get any value at all!
But why? Well, the previous method does, indeed, populate the available members of a font family to the fontFamiliesPopup , but where exactly is it called? Nowhere yet! Great, now you can run the app, select a font family, and then see the available members in the second popup! So far so good, but we still have some more distance to run and get to finish line. When selecting a font member from the second popup, an actual sample should be shown in the sampleLabel label. We can make that happen if we update the font of the sample label every time a font variation is selected.
And here is a new thing: How can we create a font a NSFont object using the data we have so far? If you think about it, we have values for all parameters, as traits and weight are parts of the font member data that we keep in the fontFamilyMembers collection. Also, the selected font family is also kept to the selectedFontFamily property. Run the app again, and this time you will have both a sample of the selected font, and its PostScript name too! Our small app is working, but there are a few details left untouched.
Moreover, no font members are contained in the fontTypesPopup popup button until we update the selected font family. To get around that, we will go back to one of the first methods created here, the populateFontFamilies. To make the sample label show the font sample of the first member found in the fontTypesPopup popup button automatically, we need to update the updateFontTypesPopup method as shown in the next snippet:. First, we auto-select the first item in the popup. Lastly, one more detail that will show us a general technique beyond the demo app specifics….
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Our small application is working perfectly at this point and all steps presented so far have already shown some important how-to stuff regarding macOS programming. This will give us the chance to explore and talk about more things that will make this post more complete and valuable. That might not sound such a big deal given that we can already see them one by one through the popup buttons we have. By doing that though, we will learn:.
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Back to Main. You will notice that along with the window controller, an attached view controller is added as well! At first, click on the new window and then show the Identity Inspector. And now, switch to the Attributes Inspector. A new section has been added to the top, named Panel!
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The default value in the Style popup is Regular Panel , which means the normal window appearance. Two more panel types are supported:. Both of them are meant to exist as auxiliary windows that contain supplementary options or information to the content shown on the main window.
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A HUD panel is similar to a Utility panel, with the obvious graphical difference. You are encouraged to read the Human Interface Guidelines about panels here. One last thing before we move to the next step. You will see in a while why we need that. Along with the window controller, a new view controller was added too to the project.
That brings us to the need to create a new NSViewController subclass that we will connect to that new view controller. Get finished with the creation of the new file. Again to the Main. Next, click on the main view of the view controller, and show the Size Inspector. We will use the textview to display all available font members of a font family formatted. The button will be used to close the window.
In the FontsDisplayViewController. Finally, in the Main. Once there, you name the app and make a few selections to set up this project. For this simple app, you can turn off all of the options at the bottom like the Notification Scene, Glance Scene, etc.
For this project, the iOS app will be left blank. Your first iOS App in Swift.