iOS library to create elegant, interactive clocks.
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BEMAnalogClock makes it easy to create and customize clocks for iOS.

Table of Contents

Project Details

Learn more about the BEMAnalogClock project requirements, licensing, and contributions.


  • Requires iOS 6 or later. The sample project is optimized for iOS 7.
  • Requires Automatic Reference Counting (ARC).
  • Optimized for ARM64 Architecture


See the License. You are free to make changes and use this in either personal or commercial projects. Attribution is not required, but it is appreciated. A little Thanks! (or something to that affect) would be much appreciated. If you use BEMAnalogClock in your app, let us know.


Any contribution is more than welcome! You can contribute through pull requests and issues on GitHub.

Sample App

The iOS Sample App included with this project demonstrates how to correctly setup and use BEMAnalogClock. You can refer to the sample app for an understanding of how to use and setup BEMAnalogClock.


Gitter chat
Join us on Gitter if you need any help or want to talk about the project.


All methods, properties, types, and delegate methods available on the BEMAnalogClock class are documented below. If you're using Xcode 5 with BEMAnalogClock, documentation is available directly within Xcode (just Option-Click any method for Quick Help).


The easiest way to install BEMAnalogClock is to use CocoaPods. To do so, simply add the following line to your Podfile:

pod 'BEMAnalogClock'

The other way to install BEMAnalogClock, is to drag and drop the Classes folder into your Xcode project. When you do so, check the "Copy items into destination group's folder" box.


Setting up BEMAnalogClock in your project is simple. Follow the steps below to get everything up and running.

  1. Import "BEMAnalogClockView.h" to the header of your view controller:

     #import "BEMAnalogClockView.h"
  2. Implement the BEMAnalogClockDelegate to the same view controller:

     @interface YourViewController : UIViewController <BEMAnalogClockDelegate>
  3. BEMAnalogClockView can be initialized in one of two ways. You can either add it directly to your interface (storyboard file) OR through code. Both ways provide the same initialization, just different ways to do the same thing. Use the method that makes sense for your app or project.

    Interface Initialization
    1 - Add a UIView to your UIViewController
    2 - Change the class type of the UIView to BEMAnalogClockView
    3 - Link the view to your code using an IBOutlet. You can set the property to weak and nonatomic.
    4 - Select the Connect the BEMAnalogClockView in your interface. Connect the delegate property to your ViewController.

    Code Initialization
    Just add the following code to your implementation (usually the viewDidLoad method).

    BEMAnalogClockView *myClock = [[BEMAnalogClockView alloc] initWithFrame:CGRectMake(105, 100, 100, 100)];
    myGraph.delegate = self;
    [self.view addSubview:myClock];

Setting up the time on the clock

By default, the clock will display 10:10. There are two ways to initialize the clock with a custom time.

By directly attributing values to the time properties
The easiest way is to change the values of the NSInteger properties hours, minutes and seconds. For example in viewDidLoad, the time on the clock could be set up this way:

self.myClock.hours = 7;
self.myClock.minutes = 37;
self.myClock.seconds = 10;

By conforming to the BEMAnalogClockDelegate protocol
The other way to set up the time on the clock is by using the delegate methods timeForClock: and dateFormatterForClock:. timeForClock: should return a string containing the time you want the clock to be set up at. dateFormatterForClock: should return the date format (string) used by the string for the time. Here is an example on how these methods are used on a ViewController:

- (NSString *)timeForClock:(BEMAnalogClockView *)clock {
    return @"11, 03 1982 07:37:10"; // The string containing the time

- (NSString *)dateFormatterForClock:(BEMAnalogClockView *)clock {
    return @"MM, dd yyyy HH:mm:ss"; // The date format used by the string in “timeForClock”.

Reloading the clock

BEMAnalogClock has a reloadClock method. Calling it will completely reload/reinitialize the clock. layoutSubviews will be called again as well as all of the properties. The clock will be entirely redrawn.

- (void)anyMethodInYourOwnController {
    // Change clock properties
    [self.myClock reloadClock]; // Reload the clock

Updating the time on the clock

The method updateTimeAnimated: is here to change the time on the clock after it’s been initialized. The parameter animated controls if the hands on the clock should go to the new position with an animation or simply “jump” there. Here is an example of how to use it:

-(void)anyMethodInYourOwnController {
  // Update the time on the clock
  self.myClock.hours = arc4random() % 12 // Random value between 1 and 12
  self.myClock.minutes = arc4random() % 60 // Random value between 1 and 60 
  self.myClock.seconds = arc4random() % 60 // Random value between 1 and 60
  [self.myClock updateTimeAnimated:YES] // Update the time on the clock

Current time

BEMAnalogClock makes it possible to set the time on the clock to the time of the user’s device. There are two ways to do so. When initializing the clock, you can set the property currentTime to YES (default value is NO).

myClock.currentTime = YES;

Or you can call the method setClockToCurrentTimeAnimated:. The parameter animated is similar to the one of updateTimeAnimated. It controls if the hands of the clock should move with an animation to the new position or not.

- (void)anyMethodInYourOwnController {
    [self.myClock setClockToCurrentTimeAnimated:YES]; // Set the time on the clock to the one on the user's device

Real time

The clock can be updated in real time. Meaning that the second hand will move every second, the minute one every minute and the hour one every hour. To do so, you can either set the property realTime to YES (default value is NO) when initializing the graph.

myClock.realTime = YES;

Or you can use the methods startRealTime and stopRealTime to start/stop the real time feature:

[self.myGraph startRealTime]; // The clock will start being updated in real time.
[self.myGraph stopRealTime]; // The clock will stop being updated in real time.

The property realTimeIsActivated (read only) reports if the clock is currently using the real time feature or not.

Time reporting

The method currentTimeOnClock: is here to get the time currently displayed on the clock. It gets called every time the clock is updated. The parameters hours, minutes and seconds are strings of the hours, minutes and seconds currently displayed on the clock.
Here is an example on how to use the method:

- (void)currentTimeOnClock:(BEMAnalogClockView *)clock Hours:(NSString *)hours Minutes:(NSString *)minutes 
    NSLog(@"Hours: %@", hours); // The hours currently displayed on the clock by the hour hand.
    NSLog(@"Minutes: %@", minutes); // The minutes currently displayed on the clock by the minute hand.
    NSLog(@"Seconds: %@", seconds); // The seconds currently displayed on the clock by the second hand.

Adjusting the time on the clock via touch

The BOOL property setTimeViaTouch, when set to YES, provides a way to adjust the time on the clock via touch input. The minute hand will follow the user's finger around the clock. The default value of this property is NO.


Thankfully, BEMAnalogClock is highly customizable.

Customization of the hands

Different properties are here to customize the hands of a clock created with BEMAnalogClock.
hourHandColor, minuteHandColor and secondHandColor control the color of the hands.
hourHandAlpha, minuteHandAlpha and secondHandAlpha control the alpha of the hands.
hourHandWidth, minuteHandWidth and secondHandWidthcontrol the width of the hands.
hourHandLength, minuteHandLength and secondHandLength control the length of the hands.
hourHandOffsideLength, minuteHandOffsideLength and secondHandOffsideLength control the length of the back of the hands.
If enableShadows is set to YES, the hands are going to cast a shadow.

Customization of the clock's face

Here are the properties used to customize the clock's face:
faceBackgroundColor defines the background color of the clock.
faceBackgroundAlpha defines the background alpha of the clock.
borderColor defines the color of the border.
borderAlpha defines the alpha of the border.
borderWidth defines the width of the border.

Customization of the graduations

Five methods make it easy to customize the graduations of the clock. They all control a parameter (color, alpha, width, length, offset) at a specific graduation. Each graduation is defined by an index going from 0 to 59.

  1. graduationColorForIndex: controls the color of the graduations.
  2. graduationAlphaForIndex: controls the alpha of the graduations.
  3. graduationWidthForIndex: controls the width of the graduations.
  4. graduationLengthForIndex: controls the length of the graduations.
  5. graduationOffsetForIndex: controls the distance from the border of the graduations.

Here is an example on how to use the graduationLengthForIndex: method:

- (CGFloat)analogClock:(BEMAnalogClockView *)clock graduationLengthForIndex:(NSInteger)index {
    if (index == 30) { 
    return 50; // The length of 30th graduation will be 50.
    } else if (!(index % 5) == 1){
    return 20; // The length of one graduation in every five graduation will be 20.
    } else {
    return 5; // The length of the rest of the graduations will be 5.

And here is the result of the above example. The 30th graduation of the clock is longer than the other ones. One graduation in every five graduation is also longer than the rest.

You can use the BOOL property enableGraduations to activate or deactivate the graduations on the clock. If it is set to YES the graduations will be visible, if set to NO, they won't (default value is YES).

Displaying digits on the clock's face

BEMAnalogClock gives you the option to display 12 digits on the clock's face (see above image). To do so, simply set the BOOL property `enableDigit` to YES.
self.myClock.enableDigit = YES;

Three properties are here to customize this feature: digitColor, digitFont and digitOffset.

self.myClock.digitColor = [UIColor whiteColor]; // The color of the digits displayed on the clock.
self.myClock.digitFont = [UIFont fontWithName:@"HelveticaNeue-Thin" size:17]; // The font of the digits displayed on the clock.
self.myClock.digitOffset = 10; // The offset for the position of the digits from the center of the clock.

Military Time (24 Hours)

The BOOL property militaryTime gives the option to use the clock with military time.

self.myClock.militaryTime = YES; //Defaults to NO

Status reporting

When the clock starts or completes loading it will call a delegate method. When it begins reloading the clockDidBeginLoading: method is called. When loading is finished, the clockDidFinishLoading: method is called (please note that as of now, the animation is not complete when this delegate method is called).

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