Getting Started (ObjectiveC)

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201

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Computer Science

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Jan 9, 2024

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docx

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1. Start the Xcode application. If can be found in the task bar, as shown below: 2. If the Xcode application is not available on the task bar, start Xcode by selecting Launchpad from the task bar, then typing “Xcode” into the search bar, then click the “Xcode” icon. OR you can search for it using the Spotlight application located on the top-right corner of your menu bar, or by using the Command + Space hotkey: 3. In the Xcode startup dialog, click the Create a new Xcode project button. 4. Clicking the button opens the Choose a template for your new project dialog box. This is used to specify the type of project you want to create. Under the iOS templates select Single View Application , and then click Next .

5. The Choose options for your new project dialog box will now appear so that you can specify your project name and options. Select Objective-C for the language, make your selections and the click Next .

6. A dialog box will appear to specify the location where the project will be saved. Select the location and then click the Finish button to finish creating your project. 7. The first thing that we are going to do is add the necessary LEADTOOLS frameworks that we need into our project. To start, select the project file in the project navigator pane to open up the project settings. Under the General tab, scroll down to the bottom and click the + button under the Embedded Binaries section. 8. Click the Add Other… button to browse the system for the LEADTOOLS frameworks. The iOS frameworks will be located in the Xcode/Frameworks/iOS subdirectory of the location where you installed the LEADTOOLS SDK. Once you have located the frameworks, add the following to your project:  Leadtools.framework  Leadtools.Controls.framework  Leadtools.Converters.framework  Leadtools.ImageProcessing.Color.framework  Leadtools.ImageProcessing.Utilities.framework 9. Next we need to add the LEADTOOLS license and key file to our project that was installed with the SDK. To do this, highlight the Supporting Files group and select File -> Add Files to … menu item, or by using the Option + Command + A hotkey. The license and key files were installed to the Examples/Resources/License subdirectory of your LEADTOOLS install. 10. After adding the license and key file, click on the ViewController.h file to edit it. After opening the file, copy and paste the following code after the UIKit import: #import <Leadtools/Leadtools.h> #import <Leadtools.Converters/Leadtools.Converters.h> #import <Leadtools.Controls/Leadtools.Controls.h> #import <Leadtools.ImageProcessing.Color/Leadtools.ImageProcessing.Color.h>

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11. In your project’s build settings, modify the following build setting: Framework Search Paths = “<Path to your iOS frameworks>”) 12. Now that we have all of that configured, you should be able to build your project without any issues ( Project -> Build or Command + B ). Doing this makes Xcode compile all of the LEADTOOLS frameworks for use in all of the other files. 13. Next we are going to create our UI. To start, open up the file titled Main.storyboard . Using the Object Library in the bottom right-hand corner, drag and drop a UIView onto our view controller. Using the resizing handling, resize the view so that it occupies the entire controller except for 50 pixels on the bottom. Still having the new view highlighted, open the Identity Inspector and change the class type to LTImageViewer : 14. Next, we are going to pin this view so that it will resize accordingly with different screen sizes/resolutions. To do this, click the Pin icon in the bottom right-hand corner of the toolbar and select the following pin options:

15. Next, add three UIButton instances onto the bottom of the view controller named Load , Flip , and Invert . These buttons should be in the bottom-left, bottom-center, and bottom-right corners (respectively). After adding them to the view, select the following pin and align options: Load : Flip :

Invert :

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These are all of the constraints that you need in order to have the viewer resize itself according to the device screen size/resolution. 16. Next, we are going to add references of these objects to the ViewController class as well as hook up action methods for the buttons. To do this, first open the Assistant Editor ( View -> Assistant Editor -> Show Assistant Editor ). Once you have this open, select the ViewController.h file from the top of the Assistant Editor Pane. 17. Now that everything is set up, control drag (Hold Control key and click) from the LTImageViewer in your storyboard to the ViewController class in the Assistant Editor. Upon releasing, you will be shown a dialog allowing you to create and connect an outlet. Give your outlet a name, and then click connect:

18. Repeat the same step for each button only this time, change the connection type from Outlet to Action : The actions for the buttons should have the following names: Load : loadImageFromAlbum Flip: flipImage Invert: invertImage 19. Next add a new method declaration with the following signature: - (void)showError:(NSError *)error; 20. Lastly, add conformance to the following protocols for your ViewController class:  UIImagePickerControllerDelegate  UINavigationControllerDelegate 21. Next, open up your ViewController.m file and replace the class implementation with the following code: @synthesize imageViewer; - (void)viewDidLoad { [super viewDidLoad]; NSError *error = nil; NSString *developerKey = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"LEADTOOLS.LIC" ofType:@"key"] encoding:NSUTF8StringEncoding error:&error]; NSString *licenseFile = [[NSBundle mainBundle] pathForResource:@"LEADTOOLS" ofType:@"LIC"]; if (error != nil) { [self showError:error]; return; } [LTRasterSupport setLicenseFile:licenseFile developerKey:developerKey error:&error]; if (error != nil)

[self showError:error]; self.imageViewer.newImageResetOptions = LTImageViewerNewImageResetOptionsNone; self.imageViewer.sizeMode = LTImageViewerSizeModeFitHeight; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; [self.imageViewer freeRasterImage]; } - (IBAction)loadImageFromAlbum:(id)sender { if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) { UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Warning" message:@"Your device does not allow using the Photo Library" preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:nil]]; [self presentViewController:alert animated:YES completion:nil]; return; } UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; imagePicker.delegate = self; imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [self presentViewController:imagePicker animated:YES completion:nil]; } - (IBAction)flipImage:(id)sender { if (self.imageViewer.image == nil) // Nothing to do return; NSError *error = nil; LTRasterImage *rasterImage = [LTRasterImageConverter convertFromImage:self.imageViewer.image options:LTConvertFromImageOptionsNone error:&error]; if (rasterImage == nil) { // Error occurred [self showError:error]; return; } LTFlipCommand *command = [[LTFlipCommand alloc] initWithHorizontal:NO]; BOOL success = [command run:rasterImage error:&error]; if (!success) {

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[self showError:error]; return; } self.imageViewer.rasterImage = rasterImage; } - (IBAction)invertImage:(id)sender { if (self.imageViewer.image == nil) // Nothing to do return; NSError *error = nil; LTRasterImage *rasterImage = [LTRasterImageConverter convertFromImage:self.imageViewer.image options:LTConvertFromImageOptionsNone error:&error]; if (rasterImage == nil) { // Error occurred [self showError:error]; return; } LTInvertCommand *command = [[LTInvertCommand alloc] init]; BOOL success = [command run:rasterImage error:&error]; if (!success) { [self showError:error]; return; } self.imageViewer.rasterImage = rasterImage; } - (void)showError:(NSError *)error { NSString *message = error != nil ? [NSString stringWithFormat:@"Error\ nReason: %@\nDescription: %@\nCode: %ld", error.localizedDescription, error.localizedFailureReason, error.code] : nil; UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Error" message:message preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:nil]]; [self presentViewController:alert animated:YES completion:nil]; } - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [picker dismissViewControllerAnimated:YES completion:nil]; } - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {

self.imageViewer.image = (UIImage *)info[UIImagePickerControllerOriginalImage]; [picker dismissViewControllerAnimated:YES completion:nil]; } 22. Now, you can run your project with the ability to load, flip, and invert images:

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