Merge pull request #4 from shu223/2_background-support

background support

Pulsator.podspec

@@ -1,12 +1,12 @@
 Pod::Spec.new do |s|
  s.name = "Pulsator"
- s.version = "0.1.0"
+ s.version = "0.1.1"
  s.summary = "Pulse animation for iOS."
  s.homepage = "https://github.com/shu223/Pulsator"
  s.screenshots = "https://github.com/shu223/Pulsator/blob/master/demo.gif?raw=true"
  s.license = 'MIT'
  s.author = { "shu223" => "[email protected]" }
- s.source = { :git => "https://github.com/shu223/Pulsator.git", :tag => "0.1.0" }
+ s.source = { :git => "https://github.com/shu223/Pulsator.git", :tag => "0.1.1" }
  s.social_media_url = 'https://twitter.com/shu223'
 
  s.platform = :ios, '8.0'

Pulsator/Pulsator.swift

@@ -24,7 +24,7 @@ public class Pulsator: CAReplicatorLayer {
  pulse.backgroundColor = backgroundColor
  let oldAlpha = alpha
  alpha = CGColorGetAlpha(backgroundColor)
- if animationGroup != nil && alpha != oldAlpha {
+ if alpha != oldAlpha {
  recreate()
  }
  }
@@ -83,9 +83,7 @@ public class Pulsator: CAReplicatorLayer {
  /// The value of this property should be ranging from @c 0 to @c 1 (exclusive).
  public var keyTimeForHalfOpacity: Float = 0.2 {
  didSet {
- if animationGroup != nil {
- recreate()
- }
+ recreate()
  }
  }
 
@@ -179,6 +177,7 @@ public class Pulsator: CAReplicatorLayer {
  // MARK: - Internal Methods
 
  internal func recreate() {
+ guard animationGroup != nil else { return } // Not need to be recreated.
  stop()
  let when = dispatch_time(DISPATCH_TIME_NOW, Int64(0.2 * double_t(NSEC_PER_SEC)))
  dispatch_after(when, dispatch_get_main_queue()) { () -> Void in