Pulsar is a versatile solution for displaying pulse animations as known from Apple Maps.

Being implemented on CALayer, Pulsar is compatible with just about any UI control thinkable, given that every UIView is backed by a CALayer.

Pulsar consists of a simple category on CALayer making use of the builder pattern for hassle-free customization:

• Custom duration and repeat count.
• Custom line width.
• Custom background and/or border colors. (optional)
• Custom path. (optional)
• Start/stop blocks for attaching a callback. (optional)

While all these attributes can be set, none of them have to be set explicitly.

Pulsar will try to figure out the most likely default colors and paths on its own (inferred from the host layer's properties, such as its border color), unless one supplies it with custom properties via its builder.

For more info take a look at these methods:

    class func defaultBackgroundColorsForLayer(layer: CALayer) -> [CGColor]
    class func defaultBorderColorsForLayer(layer: CALayer) -> [CGColor]
    class func defaultPathForLayer(layer: CALayer) -> CGPathRef

To add a (one-time) pulse using smart default properties to a layer (e.g., the layer of a UIView) simply call addPulse() on it:

layer.addPulse()

Or if you want to set a custom appearance:

layer.addPulse { builder in
	builder.borderColors = [UIColor.redColor().CGColor]
	builder.backgroundColors = []
}

To have a pulse repeat a given number of times set a repeatCount on the builder:

builder.repeatCount = 42 // or Int.max for infinity

Just copy the files in "Pulsar/Classes/..." into your project.

Alternatively you can install Pulsar into your project with CocoaPods. Just add it to your Podfile: pod 'Pulsar'

Pulsar contains a demo app giving you a quick overview of some of the possible use cases.

Pulsar is implemented in Swift 3.

None.

Vincent Esche (@regexident)

Pulsar is available under a modified BSD-3 clause license with the additional requirement of attribution. See the LICENSE file for more info.