CODEWITHSUNDEEP
iphone
user1452248
user1452248

Reputation: 767

How to call a method within another method

I placed resumeLayer and PauseLayer method definitions 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;
 }

Now want to call 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: CALayer];

}
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;
    }
   } 
  }

Now when i call 

[self PauseLayer:CALayer];

&

[self resumeLayer:CALayer];

gets message in red that unexpected interface name CALayer expected expression.

Anyone can please tell how to call PauseLayer and resumeLayer method in playpauseAction method.

Thanks for help.

Upvotes: 0

Views: 258

Answers (3)

jake_hetfield
jake_hetfield

Reputation: 3398

This line does not make sense:

[self pauseLayer:CALayer];

because CALayer is a class. The compiler expects you to send in an object of type CALayer. You need to do something like:

//Get a reference to your UIImageView somehow
UIImageView *myImageView = [yourOtherClass getTheImageView];

[self pauseLayer:myImageView.layer]; // Pause the CALayer of the UIImageView

To explain why, compare with this code, lets say you have a method like this one to add a number from an NSNumber to an int "totalValue" that is stored inside a class:

/** Adds the number to totalValue **/
-(int)addNumber:(NSNumber)number {
    totalValue = totalValue + [number intValue]; 

    return totalValue;
}

The correct way to call this method would be for example:

// Store the value 10 into an NSNumber
NSNumber *numberToAdd = [NSNumber numberWithInt:10];
[self addNumber:numberToAdd]; // Add number 10 to totalValue

But this is what you are trying to do:

[self addNumber:NSNumber]; // WRONG, 'NSNumber' is not a value!

The compiler complains because CALayer is not a value, just like NSNumber is not a value. You can not do an operation like 10 + NSNumber. The code above wants an object, an instance of the class NSNumber, not a reference to the NSNumber class itself.

Upvotes: 1

M.Othman
M.Othman

Reputation: 5310

you need to put an instant not a class when you can your methods ..

so instead of calling it like this 

[self PauseLayer:CALayer];

do something like 

[self PauseLayer:(UIButton*)sender.layer];

Upvotes: 1

Alejo
Alejo

Reputation: 116

Try changing the P on -(void)pauseLayer:(CALayer*)layer {

to uppercase or the way around.

Upvotes: 0

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