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Navigation Bar with a Segmented Button in the middle

Posted: April 15th, 2010 | Author: | Filed under: Objective-C | Tags: , , , | No Comments »

We can change the buttons on a navigation bar on the left and right sides, but how do we add a button in the middle of the Navigation Bar? The trick is to use the “titleView” property of navigationItem, and to assign it the customView of our just created segmented control. For more clarity look at the code below. Feel free to comment!

  1.  
  2. NSArray *itemArray = [NSArray arrayWithObjects: @"All", @"Some", nil];
  3. chooseAllORSome = [[UISegmentedControl alloc] initWithItems:itemArray];
  4. chooseAllORSome = CGRectMake(0,0,150, 32);
  5. chooseAllORSome.segmentedControlStyle = UISegmentedControlStyleBar;
  6. chooseAllORSome.selectedSegmentIndex = 0;
  7. [chooseAllORSome addTarget:self action:@selector(pickOne:)  forControlEvents:UIControlEventValueChanged];
  8. UIBarButtonItem *segmentBarItem = [[UIBarButtonItem alloc] initWithCustomView: chooseAllORSome];
  9. self.navigationItem.titleView = segmentBarItem.customView;
  10. self.navigationItem.title = @"";
  11. [segmentBarItem release];
  12.  

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Two straightforward actions: Rotate and Animate UIViews

Posted: April 7th, 2010 | Author: | Filed under: Objective-C | Tags: , , | No Comments »

When adding subviews to a superview doing addSubview and then bringSubviewToFront, I have found that subviews do not autorotate accordingly, therefore I needed to do it programmatically. The next piece of code does a landscape rotation of a UIView to the left or to the right. Note that the UIView has to be resized and located accordingly. For that, I set up the bounds to 480×320 because I always expect a +90 or -90 degrees rotation.

  1.  
  2. #define DegreesToRadian(__ANGLE__) ((__ANGLE__) / 180.0 * M_PI)
  3.  
  4. void rotateLandscape(UIView *viewToRotate, BOOL left) {
  5. viewToRotate.transform = CGAffineTransformIdentity;
  6. if (left) viewToRotate.transform = CGAffineTransformMakeRotation(DegreesToRadian(-90));
  7. else      viewToRotate.transform = CGAffineTransformMakeRotation(DegreesToRadian(+90));
  8. viewToRotate.bounds = CGRectMake(0.0, 0, 480, 320);//resize the view
  9. viewToRotate.center = CGPointMake(160.0f, 240.0f); //set the position of the view
  10. }
  11.  

An example on how to use it is:

  1. rotateLanscape(appDelegate.mapController.view,TRUE);

The second common action, dealing with UIViews’ transitions on iPhone development, is to be able to set up an animation in the transition between views. The next code do that:

  1. void setUpAnimation(UIView *animateWindow, UIViewAnimationTransition transitionType, float duration) {
  2.  
  3. [UIView beginAnimations:@"Animation" context:nil];
  4. [UIView setAnimationDuration:duration ];
  5. [UIView setAnimationCurve:UIViewAnimationCurveLinear];
  6. [UIView setAnimationTransition: transitionType forView:animateWindow  cache:YES];
  7. [UIView commitAnimations];
  8. }

An example on how to use it is:

  1. setUpAnimation(appDelegate.window, UIViewAnimationTransitionCurlDown, 0.5);

Embedding these two actions into functions sounds like a good idea since they will be repeated throughout your application many times. Also these are basic versions, they could allow more complex animations and rotations but I leave that for another day.

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