雷达扫描搜索视图实现

最近项目需求，有个蓝牙搜索扫描的功能，美工给予了一张静态的搜索视图，而需要的效果是实现模仿雷达转动扫描的效果，下面的两种实现的方案

效果图:

搜索图片

方案一:

CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.fromValue = @0.0f;
rotationAnimation.toValue = @(2 * M_PI);
rotationAnimation.speed = 0.5;
rotationAnimation.duration = 1.0;
rotationAnimation.repeatCount = HUGE_VALF;

_serchTipLable.hidden = NO;

[self.radarImageView.layer addAnimation:rotationAnimation forKey:@"radarAnimation"];

方案二:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI / 2.0 ];
    rotationAnimation.duration = .5;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = MAXFLOAT;

    [_rotatingImageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
});