The following is the source code:
//
// ViewController.m
//
// Created by YouXianMing on 14/11/26.
// Copyright (c) 2014年 YouXianMing. All rights reserved.
//
#import "ViewController.h"
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self runAnimateKeyframes];
}
- (void)runAnimateKeyframes {
/**
* when the relativeDuration animation starts
* relativeStartTime the duration of the animation
*/
[UIView animateKeyframesWithDuration:6.f
delay:0.0
options:UIViewKeyframeAnimationOptionCalculationModeLinear
animations:^{
[UIView addKeyframeWithRelativeStartTime:0.0 // Time relative to the start of 6 seconds (start animation at 0 seconds)
relativeDuration:1/3.0 // Relative to the duration of the 6 second animation (the animation lasts 2 seconds)
animations:^{
self.view.backgroundColor = [UIColor redColor];
}];
[UIView addKeyframeWithRelativeStartTime:1/3.0 // Time relative to the start of 6 seconds (the animation starts at the 2nd second)
relativeDuration:1/3.0 // Relative to the duration of the 6 second animation (the animation lasts 2 seconds)
animations:^{
self.view.backgroundColor = [UIColor yellowColor];
}];
[UIView addKeyframeWithRelativeStartTime:2/3.0 // Time relative to the start of 6 seconds (the animation starts at the 4th second)
relativeDuration:1/3.0 // Relative to the duration of the 6 second animation (the animation lasts 2 seconds)
animations:^{
self.view.backgroundColor = [UIColor greenColor]; }];
}
completion:^(BOOL finished) {
[self runAnimateKeyframes];
}];
}
@end
Details:
