The most flexible and powerful way to build a form on iOS.

Form came out from our need to have a form that could share logic between our iOS apps and our web clients. We found that JSON was the best way to achieve this.

Form includes the following features:

• Multiple groups: For example, you can have a group for personal details and another one for shipping information
• Field validations: We support required, max_length, min_length, min_value, max_value and format (regex). We also support many field types, like text, number, phone_number, email, date, name, count and more
• Custom sizes: Total width is handled as 100% while height is handled in chunks of 85 px
• Custom fields: You can register your custom fields, and it's pretty simple (our basic example includes how to make an image field)
• Formulas or computed values: We support fields that contain generated values from other fields
• Targets: hide, show, update, enable, disable or clear a field using a target. It's pretty powerful, and you can even set a condition for your target to run
• Dropdowns: Generating dropdowns is as easy as adding values to your field, values support default flags, targets (in case you want to trigger hiding a field based on a selection), string and numeric values or showing additional info (in case you want to hint the consequences of your selection).

Form works both on the iPhone and the iPad.

You can try one of our demos by running this command in your Terminal:

pod try Form

This are the required steps to create a basic form with a first name field.

[
  {
    "id":"group-id",
    "title":"Group title",
    "sections":[
      {
        "id":"section-0",
        "fields":[
          {
            "id":"first_name",
            "title":"First name",
            "type":"name",
            "size":{
              "width":30,
              "height":1
            }
          }
        ]
      }
    ]
  }
]

AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Don't forget to set your style, or use the default one if you want
    [FORMDefaultStyle applyStyle];

    //...
}

Subclass

Make sure that your UICollectionViewController is a subclass of FORMViewController.

Targets are one of the most powerful features of form, and we support to hide, show, update, enable, disable or clear a field using a target. You can even set a condition for your target to run!

In the following example we show how to hide or show a field based on a dropdown selection.

[
  {
    "id":"group-id",
    "title":"Group title",
    "sections":[
      {
        "id":"section-0",
        "fields":[
          {
            "id":"employment_type",
            "title":"Employment type",
            "type":"select",
            "size":{
              "width":30,
              "height":1
            },
            "values":[
              {
                "id":0,
                "title":"Part time",
                "default":true,
                "targets":[
                  {
                    "id":"bonus",
                    "type":"field",
                    "action":"hide"
                  }
                ]
              },
              {
                "id":1,
                "title":"Full time",
                "targets":[
                  {
                    "id":"bonus",
                    "type":"field",
                    "action":"show"
                  }
                ]
              }
            ]
          },
          {
            "id":"bonus",
            "title":"Bonus",
            "type":"number",
            "size":{
              "width":30,
              "height":1
            }
          }
        ]
      }
    ]
  }
]

Groups have two JSON based collapsibility options: collapsed and collapsible

The collapsed option accepts true or false and defines the default state for the group it is added to. The default is false.

The collapsible option also accepts true or false but defines whether or not a group can be collapsed at all. Defining this option as false, prevents a group from being collapsed on click or with collapseAllGroupsForCollectionView. The default is true.

In your application code, you can also call collapseAllGroupsForCollectionView on the data source to collapse all groups in a collection view.

To make quick and easy integer adjustments without popping up a keyboard, you can use the count field. It works just like a number field but provides a minus button in the UITextField's leftView and a plus button in the rightView. A tap on either will decrease or increase, respectively, the number by a value of one.

{
  "groups":[
    {
      "id":"counter",
      "title":"Counter Example",
      "sections":[
        {
          "id":"counter-example",
          "fields":[
            {
              "id":"guests",
              "title":"Present Guests",
              "info":"Press minus to decrease, plus to increase",
              "type":"count",
              "value":0,
              "size":{
                "width":25,
                "height":1
              },
              "validations":{
                "required":true,
                "min_value":0,
                "max_value":100
              }
            }
          ]
        }
      ]
    }
  ]
}

FORMField *targetField = [dataSource fieldWithID:@"display_name" includingHiddenFields:YES];
id value = targetField.value;
// Do something with value

NSDictionary *initialValues = @{@"email" : @"hi@there.com",
                                @"companies[0].name" : @"Facebook",
                                @"companies[0].phone_number" : @"1222333"};

FORMDataSource *dataSource = [[FORMDataSource alloc] initWithJSON:JSON
                                                   collectionView:nil
                                                           layout:nil
                                                           values:initialValues
                                                         disabled:NO];
NSDictionary *values = dataSource.values;
// Do something with values

Form is available through CocoaPods. To install it, simply add the following line to your Podfile:

use_frameworks!

pod 'Form'

Please check our playbook for guidelines on contributing.

Hyper made this. We’re a digital communications agency with a passion for good code and delightful user experiences. If you’re using this library we probably want to hire you (we consider remote employees too, the only requirement is that you’re awesome).

Form is available under the MIT license. See the LICENSE.