Fixed the immediate value's calculation.

Author: devedbox

AXAnimationChain/Classes/CoreAnimation/CAAnimation+ImmediateValue.m

@@ -84,11 +84,13 @@ - (id)immediateValueAtTime:(CFTimeInterval)time {
 #endif
 @implementation CAKeyframeAnimation (ImmediateValue)
 - (id)immediateValueAtTime:(CFTimeInterval)time {
+    if (time >= self.duration) return self.values.lastObject;
+    
     NSUInteger allFramesCount = self.values.count;
     CGFloat pt = time/self.duration;
 
     NSUInteger index = ceil(pt * allFramesCount);
-    if (index > self.values.count-1) return nil;
+    if (index > self.values.count-1) return self.values.lastObject;
 
     id value = self.values[index];
     return value;