将NSArray插入NSDictionary

Question

如果我有NSArray，我可以把它放到NSDictionary中吗？ 如果是这样，我该怎么做？

Answer 1

NSDictionary可以将任何对象用作值，并将符合NSCopying的任何对象用作键。所以在你的情况下：

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

如果您从myArray开始：

NSArray *myArray = [NSArray arrayWithObjects:...];

如果你想要一个可变字典：

NSMutableDictionary *myMutableDictionary = [NSMutableDictionary dictionary];
[myMutableDictionary setObject:myArray forKey:@"myArray"];

如果你只想要一本字典：

NSDictionary *myDictionary = [NSDictionary dictionaryWithObject:myArray forKey:@"myArray"];

Answer 3

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