动画组合(uber启动时的等待效果)

by 伍雪颖

- (void)startAnimation
{

self.layer.masksToBounds
=
0;

self.layer.cornerRadius
=
50;

if (self.layer.sublayers
==
nil) {

[self
setUpAnimation];

}

self.layer.speed
=
1;

}

- (void)setUpAnimation {

CABasicAnimation *posAnim = [CABasicAnimation
animationWithKeyPath:@"transform.scale"];

posAnim.fromValue
=
@(0.01);

posAnim.toValue
=
@(1);

posAnim.duration
=
1;

posAnim.timingFunction
= [CAMediaTimingFunction
functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CABasicAnimation *opacity = [CABasicAnimation
animationWithKeyPath:@"opacity"];

opacity.fromValue
=
@(1);

opacity.toValue
=
@(0);

opacity.duration
=
1;

opacity.timingFunction
= [CAMediaTimingFunction
functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CAAnimationGroup *animGroup = [CAAnimationGroup
animation];

animGroup.animations
= [NSArray
arrayWithObjects:posAnim, opacity,
nil];

animGroup.duration
=
1;

animGroup.repeatCount
=
HUGE;

[self.layer
addAnimation:animGroup
forKey:nil];

}

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