A configurable chart that depicts the value of a measurement using a subtle animation.

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

pod "CHCircleGaugeView"

To install manually, just copy everything in the CHCircleGaugeView directory into your Xcode project.

Important: If your project doesn't use ARC you must add the -fobjc-arc compiler flag to all CHCircleGaugeView implementation files in Target Settings > Build Phases > Compile Sources.

Instantiate like any other view and customize it as needed:

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    
    CGRect frame = CGRectMake(0, 0, 200, 200);
    CHCircleGaugeView *circleGaugeView = [[CHCircleGaugeView alloc] initWithFrame:frame];
    [self.view addSubView:circleGaugeView];
    
    [circleGauge setValue:0.5 animated:YES];
}

There is a state property of type CHCircleGaugeViewState that determines how to display a few things.

• CHCircleGaugeViewStateNA: "n/a" is displayed in the center of the circle and the gauge inside the track will not be present. The displayed string can be changed by setting the notApplicableString property on the gauge.
• CHCircleGaugeViewStatePercentSign: "%" is displayed in the center of the circle and the gauge inside the track will not be present. The displayed string can be changed by setting the noDataString property on the gauge.
• CHCircleGaugeViewStateScore: A whole number (with an optional units suffix) is displayed in the center of the circle and the gauge inside the track will represent the value.

Modifying or setting the value property will automatically cause the state to switch to CHCircleGaugeViewStateScore.

To change the value of the gauge you can call setValue:animated: or set value.

The gauge can easily be configured by adjusting public properties:

• trackTintColor: The color shown for the portion of the gauge that is always filled.
• gaugeTintColor: The color shown on top of trackTintColor for the portion of the gauge that varies based on the value property.
• textColor: The color of the text.
• font: The font of the text.
• trackWidth: The width for the portion of the gauge that is always filled. Defaults to a value of 0.5.
• gaugeWidth: The width for the portion of the gauge that varies based on the value property. Defaults to a value of 2.
• unitsString: String that is a suffix on the value. This string is meant to be just a few characters long. Defaults to nil.
• notApplicableString: The text shown when the state of the gauge is CHCircleGaugeViewStateNA. Defaults to "n/a".
• noDataString: The text shown when the state of the gauge is CHCircleGaugeViewStatePercentSign. Defaults to "%".
• gaugeStyle: Determines how the gauge is drawn relative to the track. Defaults to CHCircleGaugeStyleInside.

Pull request are welcomed. To add functionality or to make changes:

1. Fork this repo.
2. Open CHCircleGuageViewExample.xcworkspace in the CHCircleGuageViewExample directory.
3. Make changes to the necessary files in the CHCircleGaugeView group.
4. Ensure new public methods are documented.
5. Submit a pull request.

Created by Osama Ashawa, Matthew Morey, Rogelio Gudino, and other contributors.

CHCircleGaugeView is available under the MIT license. See the LICENSE file for more information. If you're using CHCircleGaugeView in your project, attribution would be nice.