蓝懿教育九月二十日

字典是无序的

创建字典

• NSMutableDictionary *dic=[NSMutableDictionary dictionary];
• NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithObject:@"张三" forKey:@"name"];

字典添加数据

[dic setObject:@"张小三"forKey:@"sonName"];

[dic setObject:@[@"小明",@"小李",@"小张"] forKey:@"firends"];

从字典中取数据

NSString *name = [dic objectForKey:@"sonName"];

NSArray *firendArr = dic[@"firends"];

遍历字典

NSArray *keys = dic.allKeys;

for (NSString *key in keys) {
        NSObject *obj = dic[key];
        NSLog(@"字典中装的是：%@",obj);

}