iOS - Smooth Color Change Transition/Animation

Question

I want to have a smooth color transition that goes across the entire spectrum (i.e. red, blue, green, yellow, orange, etc.)

Also want to be able to have smooth transitio

Answer 1

Use following code for color transition in iOS, it gives you various configureable options:
1) Delay before starting animation
2) Callback on animation completion
3) Options for animation

[UIView animateWithDuration:1.0 delay:0.2 options:0 animations:^{
        view.backgroundColor = [UIColor greenColor];
    } completion:^(BOOL finished)
     {
         NSLog(@"Color transformation Completed");
     }];

For Detailed description of different animations please visit:
UIView Tutorial for iOS: How To Use UIView Animation