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If I have a NSArray, can I put this into a NSDictionary? If so, how can I do this?
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In Objective-C, the compiler generates code that makes an underlying call to the init(objects:count:) method. id objects[] = { someObject, @"Hello, World!", @42 }; NSUInteger count = sizeof(objects) / sizeof(id); NSArray *array = [NSArray arrayWithObjects:objects count:count];
You have to convert NSDictionary to NSMutableDictionary . You have to user NSMutableDictionary in place of the NSDictionary . After that you can able to change value in NSMutableDictionary .
NSDictionary / NSMutableDictionary copies keys, and holds strong references to values. NSMapTable is mutable, without an immutable counterpart. NSMapTable can hold keys and values with weak references, in such a way that entries are removed when either the key or value is deallocated.
Main Difference is:NSMutableDictionary is derived from NSDictionary, it has all the methods of NSDictionary. NSMutableDictionary is mutable( can be modified) but NSDictionary is immutable (can not be modified).
An NSDictionary can use any objects as values, and any objects that conforms to NSCopyingas keys. So in your case:
NSArray * myArray = [NSArray arrayWithObjects:@"a", @"b", @"c"];
NSDictionary * dict = [NSDictionary dictionaryWithObject:myArray forKey:@"threeLetters"];
NSMutableDictionary * mutableDict = [NSMutableDictionary dictionaryWithCapacity:10];
[mutableDict setObject:myArray forKey:@"threeLetters"];
If you start with myArray:
NSArray *myArray = [NSArray arrayWithObjects:...];
If you want a mutable dictionary:
NSMutableDictionary *myMutableDictionary = [NSMutableDictionary dictionary];
[myMutableDictionary setObject:myArray forKey:@"myArray"];
If you just want a dictionary:
NSDictionary *myDictionary = [NSDictionary dictionaryWithObject:myArray forKey:@"myArray"];
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