To make things a little interesting, you are going to add instances of UILabel to the screen at random positions. In BNRHypnosisViewController.m, implement a new method that will draw a given string on the screen twenty times at random positions.
- (void)drawHypnoticMessage:(NSString *)message
{
for (int i = 0; i < 20; i++) {
UILabel *messageLabel = [[UILabel alloc] init];
// Configure the label's colors and text
messageLabel.backgroundColor = [UIColor clearColor];
messageLabel.textColor = [UIColor whiteColor];
messageLabel.text = message;
// This method resizes the label, which will be relative
// to the text that it is displaying
[messageLabel sizeToFit];
// Get a random x value that fits within the hypnosis view's width
int width =
(int)(self.view.bounds.size.width - messageLabel.bounds.size.width);
int x = arc4random() % width;
// Get a random y value that fits within the hypnosis view's height
int height =
(int)(self.view.bounds.size.height - messageLabel.bounds.size.height);
int y = arc4random() % height;
// Update the label's frame
CGRect frame = messageLabel.frame;
frame.origin = CGPointMake(x, y);
messageLabel.frame = frame;
// Add the label to the hierarchy
[self.view addSubview:messageLabel];
}
}
In BNRHypnosisViewController.m, update the textFieldShouldReturn: method to call this new method, passing in the text field’s text, clear the text that the user typed, and then dismiss the keyboard by calling resignFirstResponder.
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSLog(@"%@", textField.text);
[self drawHypnoticMessage:textField.text];
textField.text = @"";
[textField resignFirstResponder];
return YES;
}
Build and run the application, and enter some text into the text field. After tapping the return key, the text should be displayed on instances of UILabel across the view.