简单旋转动画

// 某电商app首页的tableViewCell中有这种效果.
// 挺好玩的
// 做旋转动画的图片
UIImageView *ggIV = [[UIImageView alloc] init];
ggIV.frame = CGRectMake(78, 38, 19, 35);
ggIV.image = [UIImage imageNamed:@"gg"];
// 改锚点到top中间
ggIV.layer.anchorPoint = CGPointMake(0.5, 0.0);
[V addSubview: ggIV];
self.ggIV = ggIV;

// 围绕z轴 旋转动画
CABasicAnimation *momAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
momAnimation.fromValue = [NSNumber numberWithFloat:-M_PI_4];
momAnimation.toValue = [NSNumber numberWithFloat:M_PI_4];
momAnimation.duration = 0.7;
momAnimation.repeatCount = CGFLOAT_MAX;
// 自动反转
momAnimation.autoreverses = YES;
// 给个旋转动画
[self.ggIV.layer addAnimation:momAnimation forKey:@"animateLayer"];

某电商旋转动画

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// 雷达动画
// 某外卖类app的首页效果不错
// 用工具分析界面构成并提取出图片资源模仿之
- (void)Addradar
{
    UIView *containerV = [[UIView alloc] init];
    containerV.frame = CGRectMake(100, 200, 220, 220);
    containerV.backgroundColor = [UIColor grayColor];
    [self.view addSubview: containerV];
    
    // 背景图 有两个圆圈的
    UIImageView *bg = [[UIImageView alloc] init];
    bg.frame = containerV.bounds;
    bg.image = [UIImage imageNamed: @"radar_bg"];
    [containerV addSubview: bg];
    
    // 放大缩小的4个点图
    UIImageView *i1 = [[UIImageView alloc] init];
    i1.frame = CGRectMake(53, 58, 11, 15);
    i1.image = [UIImage imageNamed: @"icon1"];
    i1.transform = CGAffineTransformScale(i1.transform, 0.1, 0.1);
    [containerV addSubview: i1];
    [self iconScaleWithImageView: i1 beginTime: 0.8];
    
    UIImageView *i2 = [[UIImageView alloc] init];
    i2.frame = CGRectMake(125, 80, 11, 15);
    i2.image = [UIImage imageNamed: @"icon2"];
    i2.transform = CGAffineTransformScale(i1.transform, 0.1, 0.1);
    [containerV addSubview: i2];
    [self iconScaleWithImageView: i2 beginTime: 0.2];
    
    UIImageView *i3 = [[UIImageView alloc] init];
    i3.frame = CGRectMake(60, 155, 11,15);
    i3.image = [UIImage imageNamed: @"icon3"];
    i3.transform = CGAffineTransformScale(i1.transform, 0.1, 0.1);
    [containerV addSubview: i3];
    [self iconScaleWithImageView: i3 beginTime: 0.6];
    
    UIImageView *i4 = [[UIImageView alloc] init];
    i4.frame = CGRectMake(155, 130, 11, 15);
    i4.image = [UIImage imageNamed: @"icon4"];
    i4.transform = CGAffineTransformScale(i1.transform, 0.1, 0.1);
    [containerV addSubview: i4];
    [self iconScaleWithImageView: i4 beginTime: 0.4];
    
    // 中间旋转的雷达指针图片
    UIImageView *radarIV = [[UIImageView alloc] init];
    radarIV.frame = CGRectMake(0, 0, 220, 220);
    radarIV.image = [UIImage imageNamed: @"radar_s"];
    [containerV addSubview:radarIV];
    // 给个旋转动画
    CABasicAnimation *radarRotation = [CABasicAnimation animation];
    radarRotation.keyPath = @"transform.rotation";
    radarRotation.toValue = @(2 * M_PI);
    radarRotation.duration = 2.8;
    radarRotation.repeatCount = MAXFLOAT;
    radarRotation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    [radarIV.layer addAnimation:radarRotation forKey:@"radarRotation"];
}

// 4个点的放大缩小动画
- (void)iconScaleWithImageView:(UIImageView *)IV beginTime:(CGFloat)beginTime
{
    CABasicAnimation *scaleA = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    scaleA.fromValue = @0.1;
    scaleA.toValue = @1.0;
    scaleA.autoreverses = YES;
    scaleA.repeatCount = MAXFLOAT;
    scaleA.duration = 0.8;
    scaleA.removedOnCompletion = NO;
    scaleA.fillMode = kCAFillModeForwards;
    scaleA.beginTime = CACurrentMediaTime() + beginTime;
    [IV.layer addAnimation:scaleA forKey:@"IV"];
}

某外卖旋转动画

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// 网易新闻的下拉刷新动画 缩放+移动
UIView *containerV = [[UIView alloc] init];
containerV.frame = CGRectMake(100, 200, 50, 30);
[self.view addSubview:containerV];

UIImageView *bgIV = [[UIImageView alloc] init];
bgIV.frame = CGRectMake(10, 0, 30, 30);
bgIV.image = [UIImage imageNamed:@"refresh_sphere"];
[containerV addSubview:bgIV];

UIImageView *circleIV = [[UIImageView alloc] init];
circleIV.frame = CGRectMake(0, 8, 50, 15);
circleIV.image = [UIImage imageNamed:@"refresh_circle"];
[containerV addSubview:circleIV];

// 绽放动画
CABasicAnimation *scaleBA = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
scaleBA.fromValue = [NSNumber numberWithFloat:0.5];
scaleBA.toValue = [NSNumber numberWithFloat:1.0];
scaleBA.repeatCount = MAXFLOAT;
scaleBA.autoreverses = YES;
scaleBA.duration = 0.7;

// Y值动画
CABasicAnimation *transBA = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
transBA.fromValue = [NSNumber numberWithFloat:-8.];
transBA.toValue = [NSNumber numberWithFloat:8.];
transBA.repeatCount = MAXFLOAT;
transBA.autoreverses = YES;
transBA.duration = 1.4;

CAAnimationGroup *group = [[CAAnimationGroup alloc] init];
group.animations = @[scaleBA, transBA];
group.repeatCount = MAXFLOAT;
group.duration = 2.8;
[circleIV.layer addAnimation:group forKey:@"GROUP"];

网易新闻的下拉刷新动画 缩放+移动
http://i12.tietuku.com/58ab081217e557b2.gif

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参考资料
1: https://github.com/EnjoySR/ESRefreshControl