Where is my variable ? objective-c - objective-c

Question

I initialize a view(Image) through:
Image *myImageView = [[Image alloc]init];
myImageView.myId = randomImageNumber;
[myImageView initWithImage:myImage];
At the Image class I do a Log(LOG1) and get the previously set randomImageNumber.
Later on, in the very same Class, I do a second Log(LOG2).
Why does my second log have no value anymore ?
Here my implementation-file of the Class Image:
#synthesize myId;
-(id) initWithImage: (UIImage *) anImage
{
NSLog(#"LOG1%d",myId);
if ((self = [super initWithImage:anImage]))
{
self.userInteractionEnabled = YES;
}
return self;
}
}
-(void)touchesBegan...
....
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(#"LOG2%d",myId);
}
The "return self" empties myId which i declared in the header-file and which was set at the initialisation.
How do I prevent that ?
my Headerfile looks like this:
#interface Image : UIImageView
{
int myId;
}
#property (assign) int myId;
#end

Answer 1

I think I found it:
https://www.google.com/maps/place/Variable/#53.626739,10.025728,17z/data=!3m1!4b1!4m2!3m1!1s0x47b1885360fab615:0x584b82c7dfb5f612
Can you check if this Variable is yours?
besties
phil

Answer 2

Couple things in your code. NEVER call init more than once on an object, that just screws up your object.
Change it to this:
Image *myImageView = [[Image alloc] initWithImage:myImage];
myImageView.myId = randomImageNumber;
That is your problem, by default when initializing a subclass of NSObject, all properties are set to 0 (or nil if they are pointers).
If you need to have a default value for myId then do this:
// Image.m
#implementation
// other code
-(id) initWithImage:(UIImage *) image
{
if (self = [super initWithImage:image])
{
self.myId = randomImageNumber;
}
return self;
}
// other code
#end