Lan Yi Education September 20

Dictionaries are unordered.

Create a dictionary

• Nsmutabledictionary *dic=[nsmutabledictionary Dictionary];

• *dic = [ nsmutabledictionary dictionarywithobject : @ " Zhang San " forkey @ "Name" ";

Dictionary Add data

[dic setobject:@ " Zhangxiao "forkey:@ " Sonname "];

[dic SetObject:@[@"Xiao Ming",@"Xiao Li",@"Xiao Zhang"] Forkey:@ "Firends"];

Fetch data from the dictionary

NSString *name = [dic objectforkey:@ "Sonname"];

Nsarray *firendarr = dic[@ "firends"];

Traverse Dictionary

nsarray *keys = dic. AllKeys ;

for (NSString *key inch keys) {
NSObject *obj = Dic[key];
NSLog(@"the dictionary is loaded with:%@", obj);

}

Lan Yi Education September 20