CODEWITHSUNDEEP
iphoneobjective-cioscocoa-touch
pengfei
pengfei

Reputation: 1

How to in a viewClass notify another View class

My first view PageView.m like this

PageView.m

albumListView = [[AlbumListView alloc] initWithFrame:CGRectMake(0, 0, 45, 480)];
albumListView.tag = 1001;
[self addSubview:albumListView];
albumListView.hidden = YES;
[albumView release];

I want when my CameraView moved set albumListView.hidden = NO. How to do it!

CameraView.m

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
}

How to use delegate or other ways? Thank you!

Upvotes: 0

Views: 79

Answers (1)

aslı
aslı

Reputation: 8914

Assuming that PageView class is where the CameraView instance is created, you can do sthg like this:

In your CameraView class, define a protocol like this:

@class CameraView;
@protocol CameraViewDelegate <NSObject>

@optional
- (void)cameraViewMoved:(CameraView *)view;
@end

Then, in the same class implement a property to hold your delegate:

@property (nonatomic, assign) id<CameraViewDelegate> delegate;

In your CameraView implementation file, call your delegate's cameraViewMoved method when you want to notify it, like this:

if ([self.delegate respondsToSelector:@selector(cameraViewMoved:)]) {
        [self.delegate cameraViewMoved:self];
}

Make your PageView class a delegate of your CameraView, by putting sthg like this in your PageView.h file:

@interface PageView : <CameraViewDelegate>

And in PageView.m class, first set yourself as the delegate of your cameraView by doing sthg like cameraView.delegate = self; Then, implement the protocol method cameraViewMoved. Inside this method, you can do what you need.

Upvotes: 1

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