swift animation does not go through all keyframes -


i want go through red -> green -> blue, when add 3 colors, go through last 2 colors: 

    var duration = 6.0      uiview.animatekeyframeswithduration(duration, delay: 1.0, options: uiviewkeyframeanimationoptions.repeat | uiviewkeyframeanimationoptions.autoreverse, animations: { () -> void in         self.colortransition.backgroundcolor = uicolor.redcolor()         self.colortransition.backgroundcolor = uicolor.greencolor()         self.colortransition.backgroundcolor = uicolor.bluecolor()      }, completion: nil)

you have call addkeyframewithrelativestarttime each of 3 transitions, specifying when start , how long.

for example:

uiview.animatekeyframeswithduration(duration, delay: 1.0, options: .repeat | .autoreverse, animations: {     uiview.addkeyframewithrelativestarttime(0, relativeduration: 0.33) {         self.colortransition.backgroundcolor = uicolor.redcolor()     }     uiview.addkeyframewithrelativestarttime(0.33, relativeduration: 0.33) {         self.colortransition.backgroundcolor = uicolor.greencolor()     }     uiview.addkeyframewithrelativestarttime(0.66, relativeduration: 0.34) {         self.colortransition.backgroundcolor = uicolor.bluecolor()     } }, completion: nil)

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