IPad development: Add button dynamically

I am new to iPad development. I need to write down what I recently used so that I can forget to find it again later.

You can click an existing button to automatically create a new button and add an event to the new button. A prompt box is displayed.

1. Run Xcode 4.2 and create a Single View Application project named DynamicButton:

2. Open ViewController. xib, drag a button to the view, and set the button name to "add a button ".

3. Select this button, press Ctrl, and drag the button to the specified position of ViewController. h file:

Release the mouse and enter the following information in the pop-up window:

Add the RESPONSE event addButton for this button.

4. Open ViewController. m, find the addButton function, and add the following code:

 
 
 
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-(IBAction) addButton :( id) sender {
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// Add a button dynamically
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CGRect frame = CGRectMake (300,300,300, 50 );
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UIButton * button = [UIButton buttonWithType: UIButtonTypeRoundedRect];
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Button. frame = frame;
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[Button setTitle: @ "newly added dynamic button" forState: UIControlStateNormal];
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Button. backgroundColor = [UIColor clearColor];
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Buttons. tag = 2000;
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[Button addTarget: self action: @ selector (buttonClicked :) forControlEvents: UIControlEventTouchUpInside];
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[Self. view addSubview: button];
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}
 
 
5. Add a function after the addButton function:
 
 
 
 
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// This is the response function of the new button.
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-(IBAction) buttonClicked :( id) sender {
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UIAlertView * alert = [[UIAlertView alloc] initWithTitle: @ "prompt"
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Message: @ "click the Dynamic Button! "
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Delegate: self
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CancelButtonTitle: @ "OK"
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OtherButtonTitles: nil];
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[Alert show];
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[Alert release];
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} 6. Compile and run:

 

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