I am finding some difficulty in accessing mutable dictionary keys and values in Objective-C.
Suppose I have this:
NSMutableDictionary *xyz=[[NSMutableDictionary alloc] init];
I can set keys and values. Now, I just want to access each key and value, but I don't know the number of keys set.
In PHP it is very easy, something as follows:
foreach ($xyz as $key => $value)
How is it possible in Objective-C?
for (NSString* key in xyz) {
id value = xyz[key];
// do stuff
}
This works for every class that conforms to the NSFastEnumeration protocol (available on 10.5+ and iOS), though NSDictionary
is one of the few collections which lets you enumerate keys instead of values. I suggest you read about fast enumeration in the Collections Programming Topic.
Oh, I should add however that you should NEVER modify a collection while enumerating through it.