iPhone - Loading UIView with Custom UI from nib?

Question

I have a UIView and I initialize it from a nib file.

In my nib file I dragged and dropped a UIImageView and I changed the class name to MyImage.

When i load the view it doesn't seem like it's initializing the the image using my custom class, because the init method is not getting called. Any idea what the problem is?

@interface MyView : UIView
@property (nonatomic, retain) IBOutlet MyImage *image;
@end

@implementation MyView
@synthesize image;

- (id)init
{
   self = [super initWithNibName:@"MyView" bundle:nibBundleOrNil];
   return self;
}
@end

Here is MyImage Here is my Image

@interface MyImage : UIImageView
@end

@implementation MyImage
- (id)init
{
   // This doesn't get called 
   self = [super init];
   if (self) 
   {
      // do somethin
   }
   return self;
}
@end

I'm new to iOS so please forgive me for such question. Does really UIView have initWithNibName: bundle initializer? as you've used it in your code snippet. — anonim
– anonim, Commented Jan 13, 2013 at 23:25

Caleb · Accepted Answer · 2011-07-17 19:20:51Z

4

The initializer that's used when loading a view from a nib is -initWithCoder:, not -init. From the UIView reference page:

initWithCoder:—Implement this method if you load your view from an Interface Builder nib file and your view requires custom initialization.

Moreover, if you're instantiating the view programmatically, the usual initializer is -initWithFrame:.

So, change your -init method to -initWithCoder:, or implement -initWithCoder: such that it calls your -init.

edited Jul 17, 2011 at 19:20

answered Jul 17, 2011 at 19:14

Caleb

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4 Comments

aryaxt Over a year ago

Can you explain how to use/override this methos?

user756245 Over a year ago

View Programming Guide for iOS.

aryaxt Over a year ago

Thanks a lot one more thing, If I want to be able to init with code and from nib, am I suppose to implement both methods?

Caleb Over a year ago

The typical thing is to create your own method that has all the initialization code that's common to both -initWithCoder: and -initWithFrame:. You can then call that method from both places so that it runs no matter how you instantiate the view.

user756245 · Accepted Answer · 2011-07-17 19:21:10Z

1

Caleb is right, implement it like so :

-(id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if(self) {
        self.userInteractionEnabled = YES;
        // other stuff
    }
    return self;
}

answered Jul 17, 2011 at 19:21

user756245

1 Comment

user756245 Over a year ago

your -(id)init; method will never get called, do your stuff in -(id)initWithCoder:(NSCoder *)aDecoder;. Your view is 'deserialized' from the nib file.

brian.clear · Accepted Answer · 2012-05-11 14:44:02Z

0

I though awakeFromNib was safer as all outlets wired up correctly

-(id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if(self) {
        //self.userInteractionEnabled = YES;
        // other stuff
    }
    return self;
}

- (void)awakeFromNib
{
    ..setup view
}

Called in order:

initWithCoder
awakeFromNib

answered May 11, 2012 at 14:44

brian.clear

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1 Comment

nesimtunc Over a year ago

Can you write how to call initWithCoder with the parameter?

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