NSDictionary使用小结

int main(int argc, const char * argv[])
{

@autoreleasepool {    //创建字典    NSDictionary *dic1 = [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];    NSLog(@"dic1 :%@", dic1);    //创建多个字典    NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:                          @"value1", @"key1",                          @"value2", @"key2",                          @"value3", @"key3",                          @"value4", @"key4",                          nil];    NSLog(@"dic2 :%@", dic2);    //根据现有的字典创建字典    NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2];    NSLog(@"dic3 :%@", dic3);    //根据key获取value    NSLog(@"key3 value :%@", [dic3 objectForKey:@"key3"]);    //获取字典数量    NSLog(@"dic count :%d", dic3.count);    //所有的键集合    NSArray *keys = [dic3 allKeys];    NSLog(@"keys :%@", keys);    //所有值集合    NSArray *values = [dic3 allValues];    NSLog(@"values :%@", values);    NSMutableDictionary *mutableDic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:                                       @"mvalue1", @"mkey1",                                       @"mvalue2", @"mkey2", nil];    //添加现有的字典数据    [mutableDic addEntriesFromDictionary:dic3];    NSLog(@"mutableDic :%@",mutableDic);    //添加新的键值对象    [mutableDic setValue:@"set1" forKey:@"setKey1"];    NSLog(@"set value for key :%@",mutableDic);    //以新的字典数据覆盖旧的字典数据    [mutableDic setDictionary:dic2];    NSLog(@" set dictionary :%@",mutableDic);    //根据key删除value    [mutableDic removeObjectForKey:@"key1"];    NSLog(@"removeForkey :%@",mutableDic);    //快速遍历    for(id key in mutableDic) {        NSLog(@"key :%@  value :%@", key, [mutableDic objectForKey:key]);    }    //枚举遍历    NSEnumerator *enumerator = [mutableDic keyEnumerator];    id key = [enumerator nextObject];    while (key) {        NSLog(@"enumerator :%@", [mutableDic objectForKey:key]);        key = [enumerator nextObject];    }    //根据key数组删除元素    [mutableDic removeObjectsForKeys:keys];    NSLog(@"removeObjectsForKeys :%@",mutableDic);    [mutableDic removeAllObjects];    //删除所有元素    NSLog(@"remove all :%@", mutableDic);}return 0;

}

//打印——————————————————————————
dic1 :{
key = value;
}
dic2 :{
key1 = value1;
key2 = value2;
key3 = value3;
key4 = value4;
}
dic3 :{
key1 = value1;
key2 = value2;
key3 = value3;
key4 = value4;
}
key3 value :value3
dic count :4
keys :(
key2,
key3,
key1,
key4
)
values :(
value2,
value3,
value1,
value4
)
mutableDic :{
key1 = value1;
key2 = value2;
key3 = value3;
key4 = value4;
mkey1 = mvalue1;
mkey2 = mvalue2;
}
set value for key :{
key1 = value1;
key2 = value2;
key3 = value3;
key4 = value4;
mkey1 = mvalue1;
mkey2 = mvalue2;
setKey1 = set1;
}
set dictionary :{
key1 = value1;
key2 = value2;
key3 = value3;
key4 = value4;
}
removeForkey :{
key2 = value2;
key3 = value3;
key4 = value4;
}
key :key4 value :value4
key :key2 value :value2
key :key3 value :value3
enumerator :value4
enumerator :value2
enumerator :value3
removeObjectsForKeys :{
}
remove all :{
}