CHAPTER 4 EXERCISE SOLUTIONS
Answer to Question 1
mySecondViewController = [[MySecondViewController alloc] initWithNibName:@“MySecondViewController” bundle:nil];
Answer to Question 2
- (void)viewDidLoad { //---create a CGRect for the positioning--- CGRect frame = CGRectMake(20, 10, 280, 50); //---create a Label view--- label = [[[UILabel alloc] initWithFrame:frame] autorelease]; label.textAlignment = UITextAlignmentCenter; label.font = [UIFont fontWithName:@“Verdana” size:20]; label.text = @“This is a label”; //---create a Button view--- frame = CGRectMake(20, 60, 280, 50); button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = frame; [button setTitle:@“OK” forState:UIControlStateNormal]; button.backgroundColor = [UlColor clearColor]; //---add the views to the View window--- [self.view addSubview:label]; [self.view addSubview:button]; [super viewDidLoad]; }
Answer to Question 3
//---add the action handler and set current class as target--- [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside]; ... ... -(IBAction) buttonClicked: (id) sender{ //--add implementation here-- }
Answer to Question 4
In the HelloWorldViewController.m file, add the following code:
-(IBAction) buttonClicked: (id) sender{ UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@“Button Clicked!” message:@“Button was clicked!” delegate:self cancelButtonTitle:@“OK” otherButtonTitles:nil]; [alert show]; [alert release]; }
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