NSDictionary，NSMutableDictionary 使用

NSDictionary

key --->value
索引 --->内容
存储键值对

（1）三种创建方式：

NSDictionary *dict = [NSDictionary dictionaryWithObject:@"Jony" forKey:@"name"];

NSArray *keys = @[@"name", @"location"];
NSArray *objects = @[@"Jony", @"China"];
NSDictionary *dict = [NSDictionary dictionaryWithObject:objects forKey:keys];

NSDictionary *dict = @{@"name" : @"Jony", @"location", @"China"};

（2）调用

id obj = [dict objectForKey:@"name"];

id obj = dict[@"name"];

NSMutableDictionary

NSMutableDictionary *dict = [NSMutableDictionary dictionary];

[dict setObject:@"Jony" forKey:@"name"];

//deleate
[dict removeObjectForKey:(id)];

NSMutableDictionary *dict = @{@"name" : @"Jony", @"location", @"China"};

（1）字典遍历方式

NSArray *keys = [dict allKeys];

for (int i = 0; i < dict.count; i++)
{
NSString *key = keys[i];
NSString *object = dict[key];

NSLog(@"%@ = %@", key, object);
}

[dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop)]
{
NSLog(@"%@ -- %@", key, obj);

//Only oneTime
*stop = YES;
}