1.旋转
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
//默认是顺时针效果，若将fromValue和toValue的值互换，则为逆时针效果
animation.fromValue = [NSNumber numberWithFloat:M_PI *2];
animation.toValue = [NSNumber numberWithFloat: 0.f];
animation.duration = 1.5; //一次时间
animation.autoreverses = NO; //是否自动回倒
animation.fillMode =kCAFillModeForwards;
animation.removedOnCompletion = NO; //设置进入后台动画不停止
animation.repeatCount = CGFLOAT_MAX ; //重复次数
animation.delegate = self; //动画代理
[gifImageView.layer addAnimation:animation forKey:nil];
2.放大
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
animation.toValue = [NSNumber numberWithFloat:1.5f];
CABasicAnimation *ani1 = [CABasicAnimation animationWithKeyPath:@"opacity"];
ani1.toValue = [NSNumber numberWithFloat:0.1f];
CAAnimationGroup *anGroup = [CAAnimationGroup animation];
anGroup.animations = @[animation,ani1];
anGroup.duration = 1.f;
anGroup.autoreverses = NO;
anGroup.repeatCount = CGFLOAT_MAX;
anGroup.removedOnCompletion = NO; //设置进入后台动画不停止
[imageView1.layer addAnimation:anGroup forKey:@"a"];
[UIView animateWithDuration:0.5 animations:^{
imageView2.alpha = 1.0f;
}completion:^(BOOL finished) {
[imageView2.layer addAnimation:anGroup forKey:@"b"];
}];
