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Settings screen composing framework
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davdroman Merge pull request #44 from Argent/subclassing
Expose subclassing header files
Latest commit 883ac77 Feb 22, 2016


Bohr allows you to set up a settings screen for your app with three principles in mind: ease, customization and extensibility.


By default, Bohr supports multiple setting types such as strings, booleans or times. However, this framework has been built with extensibility in mind, meaning you can build your own custom classes to support any kind of setting type you want.

Why "Bohr"?

"Bohr" comes from Niels Bohr, conceiver of an atomic model which introduces the concept of electronic configuration, a way to organize electrons by layers around the atom nucleus.

True story.



github "DavdRoman/Bohr"


pod 'Bohr'


Drag and copy all files in the Bohr folder into your project.

At a glance

Basic setup

The settings screen you're going to set up is represented by a UITableViewController subclass called BOTableViewController. Such controller manages BOTableViewSection instances, and each one of those manages a set of BOTableViewCell instances.

Here's an example of a really simple setup included in the demo project. Please check it out to see the full implementation. Please notice the code below belongs inside the setup method of a subclassed BOTableViewController.

- (void)setup {
	[self addSection:[BOTableViewSection sectionWithHeaderTitle:@"Section 1" handler:^(BOTableViewSection *section) {
		[section addCell:[BOSwitchTableViewCell cellWithTitle:@"Switch 1" key:@"bool_1" handler:nil]];

Built-in BOTableViewCell's

There's a bunch of built-in BOTableViewCell subclasses ready to be used:

  • BOSwitchTableViewCell: manages BOOL values through a UISwitch control.
  • BOTextTableViewCell: manages NSString values through a UITextField control.
  • BONumberTableViewCell: manages NSNumber values through a UITextField control.
  • BODateTableViewCell: manages NSDate values representing a certain date. A revealing UIDatePicker is used to set the time.
  • BOTimeTableViewCell: manages NSDate values representing a certain time. A revealing UIDatePicker is used to set the time.
  • BOChoiceTableViewCell: manages NSInteger values (which you can understand as "options" from a NS_ENUM) through taps on the cell itself.
  • BOOptionTableViewCell: manages a single NSInteger value (which you can understand as an "option" from a NS_ENUM), by default depending on its position in its table view section but the setting value can be overridden. When selected, a checkmark appears on the right side.
  • BOButtonTableViewCell: allows the user to perform an action when the cell is tapped.
  • BOStepperTableViewCell: allows the user to change numeric values by tapping on a +- control.

Subclassing BOTableViewCell

Building a BOTableViewCell subclass is fairly straightforward.

First of all, the framework contains a header file called BOTableViewCell+Subclass.h. You must import that header in your subclass implementation file:

#import <Bohr/BOTableViewCell+Subclass.h>

That way you'll be able to access all the possible elements for you to implement in your subclass.

Please take a look to some of the built-in cells for a more detailed demonstration on how to subclass BOTableViewCell.


Bohr is available under the MIT license.

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