Reference of UIImageview layer created in separate class - iphone

Question

Defined resumeLayer and PauseLayer method within the #interface and #end block in h file.
#interface MainViewController : UIViewController
#property (nonatomic, retain) UIToolbar *toolbar;
#property (strong)AVAudioPlayer *audioPlayer;
#property (nonatomic, retain) NSTimer * timer;
- (void)resumeLayer:(CALayer *)layer;
- (void)pauseLayer:(CALayer *)layer;
#end
methods in m file
-(void)pauseLayer:(CALayer*)layer
{
CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
layer.speed = 0.0;
layer.timeOffset = pausedTime;
}
-(void)resumeLayer:(CALayer*)layer
{
CFTimeInterval pausedTime = [layer timeOffset];
layer.speed = 1.0;
layer.timeOffset = 0.0;
layer.beginTime = 0.0;
CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
layer.beginTime = timeSincePause;
}
For calling resumeLayer and PauseLayer method in PlayPauseAction method
-(void)playpauseAction:(id)sender {
if([audioPlayer isPlaying])
{
[sender setImage:[UIImage imageNamed:#"Play Icon.png"] forState:UIControlStateSelected];
[audioPlayer pause];
[self pauseTimer];
[self pauseLayer:ImageView.layer]; // Pause the CALayer of the UIImageView
}else{
[sender setImage:[UIImage imageNamed:#"pause.png"] forState:UIControlStateNormal];
[audioPlayer play];
[self resumeTimer];
if(isFirstTime == YES){
self.timer = [NSTimer scheduledTimerWithTimeInterval:11.0
target:self
selector:#selector(displayviewsAction:)
userInfo:nil
repeats:NO];
isFirstTime = NO;
}
}
}
ImageView is defined in class named Third
- (void)viewDidLoad
{
// Displays UIImageView
UIImageView* ImageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 5, 300, 235)];
self.view.backgroundColor = [UIColor brownColor];
// load all the frames of our animation
ImageView.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:#"3a.png"],
[UIImage imageNamed:#"3b.png"],
nil];
// all frames will execute in 24 seconds
ImageView.animationDuration = 24;
// start animating
[ImageView startAnimating];
ImageView.layer.borderWidth = 2;
ImageView.layer.borderColor = [[UIColor whiteColor]CGColor];
[ImageView.layer setMasksToBounds:YES];
[ImageView.layer setCornerRadius:15.0f];
[self.view addSubview:ImageView]; }
I want to get reference of this ImageView.layer in MainViewController class to use in
[self pauseLayer:ImageView.layer];
to pause imageview.layer animation
Now how can i get reference of this ImageView using
UIImageView *myImageView = [OtherClass getTheImageView];
to use following in playpauseAction to pause and resume Imageview layer animation
[self pauseLayer:myImageView.layer]; // Pause the CALayer of the UIImageView
Any one can help me with thisHow to reference ImageView.layer in MainviewController

Answer 1

Either you add a property to MainviewController and let ImageView set its value when it's ready, or you use NSNotificationCenter to send a notification from MainViewController to ImageView;
In ImageView:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(pauseMyLayer) name:kPauseLayerNotif object:nil];
In MainViewController:
[[NSNotificationCenter defaultCenter] postNotificationName:kPauseLayerNotif object:self];
The notification mechanism provides you a very loose coupling between the two classes and it is very easy to use.