A single action for multiple iPad / iPhone buttons, and animation

Archive - Originally posted on "The Horse's Mouth" - 2012-03-11 21:25:48 - Graham Ellis

How do we add animation to an iPad / iPhone app? How do we share one action routine across a whole lot of similar buttons? These are amongst the questions that we looked at, and answered, in the little demonstration below during today's iOS / iPad / iPhone "Geekfest" ;-).

Here is the header file ViewController.h:

  #import 

 

  @interface ViewController : UIViewController{

    UIButton *goUp;

    UIButton *goDown;

    UIImageView *crewe;

  }

 

  @property(nonatomic, retain) IBOutlet UIButton *goUp;

  @property(nonatomic, retain) IBOutlet UIButton *goDown;

  @property(nonatomic, retain) IBOutlet UIImageView *crewe;

 

  -(IBAction)movingImage:(id)sender;

@end

And the changes to ViewController.m:

  @synthesize goUp;

  @synthesize goDown;

  @synthesize crewe;

With the added action routine:

  -(IBAction)movingImage:(id)sender {

   

    if (sender == goUp) {

   

    [UIView beginAnimations:@"moveitup" context:NULL];

    [crewe setFrame:CGRectOffset([crewe frame],0,-400)];

    [UIView commitAnimations];

       

    } else {

 

    [UIView beginAnimations:@"moveitdown" context:NULL];

    [UIView setAnimationDuration:5.0];

        // Should really have used animateWithDuration 

    [crewe setFrame:CGRectOffset([crewe frame],0,400)];

    [UIView commitAnimations];

   

    }

  }

Results:

Main Content

A single action for multiple iPad / iPhone buttons, and animation