将NSArray插入NSDictionary

Question

If I have a NSArray, can I put this into a NSDictionary? If so, how can I do this?

Answer 1

An NSDictionary can use any objects as values, and any objects that conforms to NSCopying as 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"];

Answer 2

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"];

Answer 3

也许你应该读这个： http ： //developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Collections/Collections.html#//apple_ref/doc/uid/10000034i