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To fix this issue, rename ViewController. After renaming the file, the error should disappear. Select Main. Drag a button from the Object Library to the center of the view as shown below. Change the text to Tap Me! Create a UIButton outlet that points to the recently created button. While still in the Main. Press the control key on the keyboard and drag a connector from the button to a line below the greeting variable. Name this outlet helloButton. Define this method in ViewController. Go back to the Main. Build and run the app.

Notice that the button appears off-center on the simulator. Connect the button to its container and enable both vertical and horizontal centering. Run the app again to see the improvements. The following code examples illustrate these limitations:. The Simple DirectMedia Layer is an open source hardware abstraction library used primarily for games or anything that involves high-performance graphics. First download the SDL source from the download page or clone the Mercurial repo with:.

After the download or clone has finished, create a new Single View Application project in Xcode. Scroll down to the Linked Frameworks and Libraries section.

iPhone Open Application Development: Write Native Objective-C Applications for the iPhone

Tidy up the Project Navigator by selecting the newly added frameworks and grouping them using the New Group from Selection contextual menu item. Add a main. It may seem magical to push a button and have Kotlin code running on an iOS device. But there are several tools and scripts behind the scenes that help pull off this illusion.

The the Kotlin team has you covered with Gradle. The script calls the gradlew tool that is part of the Gradle Build System and passes in the build environment and debugging options.

iPhone Apps 101: Create Your First iPhone App with Xcode 5 and Objective-C

Then, gradlew invokes a custom task called copyExecutable , which copies the artifacts that gradlew builds a. Finally, the script includes the artifact in the iOS executable. Gradle uses a build script named build. You can find the build. The Build Phases script and Gradle script are required for building and loading the Kotlin aspect of the project.

There are a couple of files that any iOS project must have. Expand these folders, and you will see two files:.

iOS App with Kotlin/Native: Getting Started

This will show the locations of the Meteorites. Open Main.

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Note : You may or may not have heard of a storyboard when it comes to iOS development. In the Xcode toolbar, click on the Library button. Next, drag the Map Kit View to the phone scene where you just deleted the label. Then, drag the edges of the Map Kit View to take up the full screen. Since you only have one view to worry about, Xcode will set the constraints for you. Select the MKMapview component you added. After that, select Add Missing Constraints. ViewControllers are the heart of most iOS apps.

They are similar to Activities on Android. You are going to create a ViewController in Kotlin. Since Xcode does not understand Kotlin source code, you will have to create an empty file for your ViewController. Right-click on the kotlin folder and select New File….

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  8. In the template window, scroll down to Other section and select Empty and click Next. Name the file MeteoriteMapViewController. Hold on a second! Something is missing, here. Where is the syntax highlighting and code completions? It supports Objective-C, Swift and our friend Kotlin with a plugin. Head over to the AppCode download site to download and install the latest stable version.

    Note : Unfortunately AppCode is not free. There is a day trial of the production version. Now, click on Install JetBrains plugin and then search for kotlin native. Once restarted, select Open Project and navigate to the root folder of your MeteoriteFinder project the one that contains the MeteoriteFinder. Once the project is open, you can expand the folder structure and explore the layout.

    Double-click on MeteoriteMapViewController. Note : At this point, you may see red underlining under super coder. This is a false positive, and you may see more through out this tutorial. The syntax highlighting may also intermittantly not show up fully, due to the beta nature of the plugin. The ObjCOutlet annotation sets the mapView property as an outlet. This allows you to link the MKMapview from the storyboard to this property.

    The mapView property will be initialized at a later time than the ViewController is created, so you use the lateinit keyword. In the viewDidLoad method, add the following under super. CLLocationCoordinate2DMake is from a different module, and you will need to import from the CoreLocation module to make the compiler happy. You can write the import at the top of the file:.

    Android & iOS Apps with Xamarin | .NET

    To conform to the protocol, first implement the method mapViewDidFailLoadingMap , just in case the map fails to load. Add the following under the viewDidLoad method:. Add the following method call to the end of viewDidLoad :. Time to do so! Build the project to make sure no errors are showing, by selecting Run from the toolbar and then Build.

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    Next, you need to connect the ViewController to the layout defined in the storyboard. This means you need to add a reference to your ViewController in the storyboard. AppCode does not support editing storyboards, so this task will need to be done in Xcode. Double-click on Main. Then, click on the ViewController icon above the simulated phone:. Note : In Objective-C and Swift files, Xcode allows you to drag a line from the storyboard view directly to the code and make the connection, automatically.

    In Xcode , right-click on Main. The above code shows how the storyboard knows what views belong to your outlets. The attributes in the outlet tag do all the mapping. Note : To return to the storyboard layout, right-click on Main. Also, Xcode is only being used for editing the storyboard. Feel free to close Xcode before moving to the next section.