CAKeyframeAnimation，CABasicAnimation，CAAnimationGroup动画使用

苹果的组合动画实现方式有很多，今天主要看看CABasicAnimation，CAKeyframeAnimation，CAAnimationGroup这几个动画专用类的实现！

1.  位移动画

CAKeyframeAnimation *anima1 = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    NSValue *value0 = [NSValue valueWithCGPoint:CGPointMake(0, SCREEN_HEIGHT/2-50)];
    NSValue *value1 = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH/3, SCREEN_HEIGHT/2-50)];
    NSValue *value2 = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH/3, SCREEN_HEIGHT/2+50)];
    NSValue *value3 = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH*2/3, SCREEN_HEIGHT/2+50)];
    NSValue *value4 = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH*2/3, SCREEN_HEIGHT/2-50)];
    NSValue *value5 = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH, SCREEN_HEIGHT/2-50)];
    anima1.values = [NSArray arrayWithObjects:value0,value1,value2,value3,value4,value5, nil];

 2.缩放动画

CABasicAnimation *anima2 = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    anima2.fromValue = [NSNumber numberWithFloat:0.8f];
    anima2.toValue = [NSNumber numberWithFloat:2.0f];

  3.旋转动画

CABasicAnimation *anima3 = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    anima3.toValue = [NSNumber numberWithFloat:M_PI*4];

实现组合动画---可以单独添加，也可直接使用CAAnimationGroup

//组动画
    CAAnimationGroup *groupAnimation = [CAAnimationGroup animation];
    groupAnimation.animations = [NSArray arrayWithObjects:anima1,anima2,anima3, nil];
    groupAnimation.duration = 4.0f;
    
    [_demoView.layer addAnimation:groupAnimation forKey:@"groupAnimation"];

[_demoView.layer addAnimation:anima1 forKey:@"aa"];
 [_demoView.layer addAnimation:anima2 forKey:@"bb"];
 [_demoView.layer addAnimation:anima3 forKey:@"cc"];

如果位移动画，只是一个点，到另一个点的话，也可使用CABasicAnimation

CABasicAnimation *anima1 = [CABasicAnimation animationWithKeyPath:@"position"];
    anima1.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, SCREEN_HEIGHT/2-75)];
    anima1.toValue = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT/2-75)];
    anima1.beginTime = currentTime;
    anima1.duration = 1.0f;
    anima1.fillMode = kCAFillModeForwards;
    anima1.removedOnCompletion = NO;
    [_demoView.layer addAnimation:anima1 forKey:@"aa"];

 byzqk