字典 -> 自定义对象：
self setValuesForKeysWithDictionary:<#(nonnull NSDictionary<NSString *,id> *)#>
自定义对象 -> 字典：
Person *p = [[Person alloc] init];
p.name = @"小明";
p.age = 20;
NSDictionary *dict = [p dictionaryWithValuesForKeys:@[@"name",@"age"]];
NSLog(@"%@",dict);