// // SecondViewController.h demodelegate in Software Get barcode 39 in Software // // SecondViewController.h demodelegate barcodes for visual

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// // SecondViewController.h demodelegate generate, create none none on none projectsbarcode generating c# #import <UIKit/UIKit.h> none for none ; @protocol SecondViewControllerDelegate -(void) sum: (int) val1 secondparam: (int) val2; @optional -(void) multiply: (int) x secondvalue: (int) y; @end @interface SecondViewController : UIViewController { IBOutlet UITextField *value1; IBOutlet UITextField *value2; id <SecondViewControllerDelegate> delegate; } @property (nonatomic, retain) UITextField *value1; @property (nonatomic, retain) UITextField *value2; @property (nonatomic, retain) id <SecondViewControllerDelegate> delegate; -(IBAction) add:(id)sender; -(IBAction) multiply:(id)sender; @end. ISO Specification In this code block, we also define two UITextField class instance variables: value1 and value2 and mark them as outlets. These two outlets, value1 and value2, will be connected to the two Text Field controls that we will be adding to the View..

[ 46 ]. 3 . A delegate property is also none none created by defining an instance variable called delegate of type <SecondViewControllerDelegate>. All instance variables are defined as properties with the two attributes: retain and nonatomic, so that their accessors and mutators are generated automatically when synthesized. We also see that the previous code block includes two action methods: add and multiply, which will be connected to the two Round Rect Button controls that we will be placing in the View.

After adding this code, save the header file.. Defining the SecondViewController class and connecting controls 1. Open the SecondViewContro none none ller.xib file in the Interface Builder.

2. Drag the controls from the Library window and drop them into the View window. 3.

Double-click the two Label controls and change the text to First value and Second value.. The next step is to add two Label controls, two Text Field controls, and two Round Rect Button controls to the View of AddNameController class. Follow these steps:. 4. Double-click the two Roun none for none d Rect Button controls and change the button text to Add and Multiply. 5.

To connect the value1 outlet to the Text Field control in the View, select the File"s Owner icon in the Documents window and open the Connections Inspector window. All the outlets and action methods we defined in the header file will be visible in the Connections Inspector window under the headings Outlets and Received Actions respectively. 6.

Select the circle to the right of the value1 outlet: Keeping the mouse button pressed, drag it to the Text Field control in the View. Repeat the procedure for connecting the value2 outlet with the other Text Field control. 7.

To connect the multiply action method to the Round Rect Button control, select the circle to the right of the multiply action method. Keeping the mouse button pressed, drag it to the Multiply Round Rect Button control in the View window and release the mouse button..

[ 47 ]. Understanding Objective-C Protocol and Table View 8. Select the Touch Up Insid e from the menu that appears, as shown in the following screenshot. Repeat the procedure to connect the add action method to the Add Round Rect Button control.

. Invoking delegate methods from the SecondViewController.m implementation file We need to add code to the S econdViewController.m file that invokes the correct action method when the Add or Multiply control is pressed. The following shows the code that we will write in the ViewController class implementation file:.

// // SecondViewController.m demodelegate #import "SecondViewControlle r.h" @implementation SecondViewController @synthesize value1,value2,delegate; -(IBAction) add:(id)sender { [delegate sum: [value1.text intValue] secondparam:[value2.

text intValue]]; [self dismissModalViewControllerAnimated:YES]; [ 48 ]. 3 } -(IBAction) multiply:(i none none d)sender { [delegate multiply: [value1.text intValue] secondvalue:[value2.text intValue]]; [self dismissModalViewControllerAnimated:YES]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn"t have a superview.

[super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren"t in use. } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.

g. self.myOutlet = nil; } - (void)dealloc { [super dealloc]; } @end.

Our first action is to gener ate the value1, value2, and delegate IBOutlets, which generate their respective accessor and mutator methods. In the Add action method, we have added code that invokes the sum method of the demodelegateViewController delegate class. We then pass the user-entered numerical values to the appropriate method.

The two Text Fields in the View are connected to the value1 and value2 outlets. We then dismiss the modal View of the SecondViewController class, so that the View of the demodelegateViewController root view controller appears at the top of the display. Similarly, the Multiply action method invokes the multiply method of the delegate class and the values entered in the Text Field controls are passed to this method via outlets value1 and value2.

. The numerical values entered none for none in the Text Field controls are converted into integer format when passed to the sum and multiply methods.. [ 49 ].
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