I want to have a NSDictionary
that maps from UIView
s to something else.
However, since UIViews do not implement the NSCopying
protocol, I can't use them directly as dictionary keys.
You can use an NSValue
holding the pointer to the UIView
and use this as key. NSValues
are copyable. but, if the view is destroyed, the NSValue
will hold a
junk pointer.
Here is the actual code (based on the answer by luvieere and further suggestion by Yar):
// create dictionary
NSMutableDictionary* dict = [NSMutableDictionary new];
// set value
UIView* view = [UILabel new];
dict[[NSValue valueWithNonretainedObject:view]] = @"foo";
// get value
NSString* foo = dict[[NSValue valueWithNonretainedObject:view]];
Although this isn't really what they're intended for, you could whip up a functional dictionary-like interface using Associative References:
static char associate_key;
void setValueForUIView(UIView * view, id val){
objc_setAssociatedObject(view, &associate_key, val, OBJC_ASSOCIATION_RETAIN);
}
id valueForUIView(UIView * view){
return objc_getAssociatedObject(view, &associate_key);
}
You could even wrap this up in a class ThingWhatActsLikeADictionaryButWithKeysThatArentCopyable
*; in that case you might want to retain the views that you use as keys.
Something like this (untested):
#import "ThingWhatActsLikeADictionaryButWithKeysThatArentCopyable.h"
#import <objc/runtime.h>
static char associate_key;
@implementation ThingWhatActsLikeADictionaryButWithKeysThatArentCopyable
- (void)setObject: (id)obj forKey: (id)key
{
// Remove association and release key if obj is nil but something was
// previously set
if( !obj ){
if( [self objectForKey:key] ){
objc_setAssociatedObject(key, &associate_key, nil, OBJC_ASSOCIATION_RETAIN);
[key release];
}
return;
}
[key retain];
// retain/release for obj is handled by associated objects functions
objc_setAssociatedObject(key, &associate_key, obj, OBJC_ASSOCIATION_RETAIN);
}
- (id)objectForKey: (id)key
{
return objc_getAssociatedObject(key, &associate_key);
}
@end
*The name may need some work.
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