Storyboards Tutorial for iOS: Part 1 | index-art.info
Select another file (which isn't an Interface Builder type) in the current I haven't been able to determine what causes the problem, but in every. 1) What you must do is to delete index-art.infooard (select throw to Trash) Once you find it, you can use an editor (vim or perhaps emacs) to view the actual file. Enable “Safe Area Layout Guides” on storyboard. What we need to do next is to update the top constraint of Label-A by setting up a relationship between Label-A .Top and Safe Area. you will be able to see that Label-A magically positioned itself to the correct . Mental Models I Find Repeatedly Useful.
Now to create the real Ratings app with several view controllers. This can be done by clicking on View Controller in the Document Outline and pressing the delete key. You can zoom in and out by double-clicking the canvas, or set the zoom scale by ctrl-clicking the canvas and selecting the zoom level.
The new Tab Bar Controller comes pre-configured with two additional view controllers — one for each tab. UITabBarController is a so-called container view controller because it contains one or more other view controllers.
Storyboards Tutorial for iOS: Part 1
The container Relationship is represented by the arrows between the Tab Bar Controller and the view controllers it contains. An embed Relationship in particular is signified by the icon seen below in the middle of the arrow body. This makes it possible to move them around together. Selected scenes have a thin blue outline. This allows you to see something happen when you switch between the tabs. Build and run the app.
In the canvas, an arrow now points at the Tab Bar Controller: Now you can see a tab bar and can switch between the two view controllers: To change the initial view controller, you can also drag the arrow between view controllers.
Xcode comes with a template for building a tabbed app called the Tabbed Application template. If you connect more than five scenes to the Tab Bar Controller, it automatically gets a More… tab when you run the app. Click on the first view controller in the Document Outline to select it, then delete it. Drag a new Table View Controller into the canvas where the previous scene used to be: Next, you want to place the Table View Controller inside a navigation controller.
First, select the Table View Controller. This adds another controller to the canvas: You could have dragged in a Navigation Controller from the Object Library and embedded the table view, but this Embed In command is a nice time saver for a common action. Since the Navigation Controller is also a container view controller just like the Tab Bar Controllerit has a relationship arrow pointing to the Table View Controller. You can also see these relationships in the Document Outline: Notice embedding the Table View Controller gave it a navigation bar.
When you let go, a small popup menu appears. Choose the Relationship Segue — view controllers option: This creates a new relationship arrow between the two scenes. This is also an embed Relationship as you saw with the other controllers contained by the Tab Bar Controller. The Tab Bar Controller has two embed relationships, one for each tab. For this app, you want this new scene to be the first tab, so drag the tabs around to change their order: Build and run the app to try it out.
The first tab now contains a table view inside a navigation controller. Before you put some actual functionality into this app, you need to clean up the storyboard a little.
Next, rename the Tab Bar Item for the second tab to Gestures the same way you did above. A well-designed app should also put icons on these tabs. The resources for this tutorial contains a subfolder named Images. Drag that folder into the Assets. A view controller embedded inside a Navigation Controller has a Navigation Item used to configure the navigation bar.
Alternatively, you can double-click the navigation bar and change the title there. You should double-click the simulated navigation bar in the Table View Controller, not the actual Navigation Bar object in the Navigation Controller. Now marvel at your pretty tab bar, created without writing a single line of code! Prototype Cells Prototype cells allow you to easily design a custom layout for your table view cells directly within the storyboard editor.
The Table View Controller comes with a blank prototype cell. Click the cell to select it and in the Attributes inspector set the Style option to Subtitle. This immediately changes the appearance of the cell to include two labels. With so much stackable content on a storyboard, it can sometimes be difficult to click on exactly what you want. One is you can select the item in the Document Outline to the left of the canvas. The second is a handy hotkey: A popup will appear allowing you to select any element directly under your cursor.
All prototype cells must have a reuse identifier so you can refer to them in code. Build and run the app, nothing has changed. Add a new file to the project. Uncheck Also create XIB file. Choose the Swift language and hit Next followed by Create. This is an essential step for hooking up a scene from the storyboard with your custom view controller subclass.
Now when you run the app the table view controller from the storyboard is an instance of the PlayersViewController class. Replace the code in Player. Player is simply a container object for these three properties: Next, create a new file using the Swift File template named SampleData.
Replace the contents of SampleData. If not, it will automatically allocate a prototype cell and return it to you.
All you need to do is supply the re-use identifier you set on the prototype cell in the storyboard editor — in this case PlayerCell.
Build and run the app, the table view has players in it! It takes just a few lines of code to use these prototype cells. If your table needs to display different kinds of cells you can add additional prototype cells to the storyboard. Make sure to give each cell its own re-use identifier!
Solution for “No Selection” in Xcode Interface Builder | Embraceware Blog
The default labels now disappear. First make the cell a little taller. Either change the Row Height value in the Size inspector after checking Custom or drag the handle at the bottom of the cell. Make the cell 60 points high.
Drag two Label objects from the Objects Library into the cell and place them roughly where the standard labels were previously. Just play with the font and colors in the Attributes Inspector and pick something you like. Set the text of the top label to Name and the bottom label to Game. Stack views were introduced in in iOS 9 and are brilliant for easily laying out collections of views. Smaller storyboards also make the projects structure more maintainable because files can be named in a meaningful way like Address.
To go one step further we could even put all relevant designs and classes in a folder named Address. It is possible to make an architectural mistake, especially when a project evolves with additional unplanned features. So what if we already made a giant and hairy storyboard? Fortunately, Xcode supports splitting it into smaller pieces.
It will create for you a new Storyboard file with all selected items in it. Also, your segues are still there, but they target a Storyboard Reference!
Cutting also helps to make development faster because massive SBs become painfully slow in Xcode. Styling Every elegant User Interface follows the basic principle of using a consistent theme all over the app. Furthermore, if a color of one element changes, we need to go through the whole app and hunt for all instances to apply a new styling happily Xcode 8 supports searching in IB files. A simple solution to that inconvenience could be writing a custom class for reusable UI controls.
Such class could define values of mutual appearance attributes.
Here is an example of UIButton subclass: We can create a button in IB, set up its constraints and title. To apply styling we need to specify the class in Identity Inspector. An example of such architecture could be an extension to the UIView: To manage colors we could use a struct containing all reusable colors: Or more sophisticated solution like Chameleon lib.
Presented solution may not be sufficient in all scenarios.
- interface builder was unable to determine the type of "Main.storyboardc"
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What if there are buttons that run the same action, but look different? That could be addressed by additional subclassing and protocols. Another useful tool is UIAppearance protocol. It changes the appearance of controls globally. As an example, we can define the background and text color of ActionButton in AppDelegate. Unfortunately, some things are not possible e.
Here is how it can look like in practice: It saves time for switching between files and keeps things organized and in one place. Unfortunately, it might be problematic as some important properties of UIView are not exposed to Interface Builder.
An excellent example is CALayer. As a part of Core Animation library, it allows manipulating on borders, corners, masks, shadows and much more. To overcome that, we can use User Defined Runtime Attributes providing a mechanism for configuring any key-value coded property in IB which makes it a powerful tool. On the other hand, the type and value of an attribute need to be set separately for each item, without any autocompletion or hinting, which makes it clumsy.
IBInspectable properties solve this problem in an elegant way. Properties marked as inspectable are exposed to a developer in Attributes Inspector. Personally, I suggest adding inspectable properties directly to UIView class carefully.
They can quickly flood Attributes Inspector so we will have to scroll through a long list of properties to find the one we are looking for. Runtime errors Have you ever made a typo in a segue or reusable identifier name? I guess that not once or twice.