给需要的朋友，思路还是比较简单，代码比较直接，没有封装，复制粘贴即可看到效果。

屏幕快照 2017-01-09 下午4.00.58.png

- (void)creatText{

    NSArray * colours = [NSArray arrayWithArray:[self getColoures]];
    
    UIColor * colour0 = [UIColor new];
    UIColor * colour1 = [UIColor new];
    UIColor * colour2 = [UIColor new];
    UIColor * colour3 = [UIColor new];

    
#pragma mark- gradientlayer 与 gradientlayer 之间颜色过渡
    colour0 = colours[0];
    colour1 = colours[1];
    colour2 = colours[2];
    colour3 = colours[3];
    
    
    CALayer * layer0 = [CALayer layer];
    layer0.frame = CGRectMake(20, 150, 150, 150);
    [self.view.layer addSublayer:layer0];
    
    CALayer * layer1 = [CALayer layer];
    layer1.frame = CGRectMake(0, 0, 150, 150);
    [layer0 addSublayer:layer1];

#pragma mark-4个gradientlayer颜色渐变
    CAGradientLayer * gradientlayer1 = [CAGradientLayer layer];
    gradientlayer1.frame = CGRectMake(0, 0, 75, 75);
    
    gradientlayer1.colors = @[(__bridge id)colour0.CGColor,
                              (__bridge id)colour1.CGColor];
    
    gradientlayer1.startPoint = CGPointMake(1, 0);
    gradientlayer1.endPoint = CGPointMake(0, 1);
    
    
    CAGradientLayer * gradientlayer2 = [CAGradientLayer layer];
    gradientlayer2.frame = CGRectMake(0, 75, 75, 75);
    
    gradientlayer2.colors = @[(__bridge id)colour1.CGColor,
                              (__bridge id)colour2.CGColor];

    gradientlayer2.startPoint = CGPointMake(0, 0);
    gradientlayer2.endPoint = CGPointMake(1,1);
    
    CAGradientLayer * gradientlayer3 = [CAGradientLayer layer];
    gradientlayer3.frame = CGRectMake(75, 75, 75, 75);
    
    gradientlayer3.colors = @[(__bridge id)colour2.CGColor,
                              (__bridge id)colour3.CGColor];
    
    gradientlayer3.startPoint = CGPointMake(0, 1);
    gradientlayer3.endPoint = CGPointMake(1, 0);

    CAGradientLayer * gradientlayer4 = [CAGradientLayer layer];
    gradientlayer4.frame = CGRectMake(75, 0, 75, 75);
    
    gradientlayer4.colors = @[(__bridge id)colour3.CGColor,
                              (__bridge id)[UIColor whiteColor].CGColor];
    
    gradientlayer4.startPoint = CGPointMake(1, 1);
    gradientlayer4.endPoint = CGPointMake(0, 0);

    [layer1 addSublayer:gradientlayer1];
    [layer1 addSublayer:gradientlayer2];
    [layer1 addSublayer:gradientlayer3];
    [layer1 addSublayer:gradientlayer4];

    
#pragma mark- 把下面代码注释掉，就可以看到4个人gradientlayer颜色过渡效果
    
    //路径
    UIBezierPath * beizierPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(75, 75) radius:70 startAngle: -M_PI/2 endAngle:M_PI*2 -M_PI/2 clockwise:YES];
    CAShapeLayer * shaperLayer = [CAShapeLayer layer];
    shaperLayer.lineCap = kCALineCapRound;
    shaperLayer.fillColor = [UIColor clearColor].CGColor;
    shaperLayer.strokeColor = [UIColor redColor].CGColor;
    shaperLayer.lineWidth = 5.0;
    shaperLayer.strokeStart = 0.01;
    shaperLayer.strokeEnd = 0.99;
    shaperLayer.path = beizierPath.CGPath;
    layer1.mask = shaperLayer;
    
    
    //添加动画
    CABasicAnimation * basicAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    basicAnimation.duration = 1;
    basicAnimation.fromValue = @0.0;
    basicAnimation.toValue = @(M_PI*2);
    basicAnimation.repeatCount = HUGE_VAL;
    
    [layer0 addAnimation:basicAnimation forKey:@"transform.rotation.z"];
}

#pragma mark- 获取颜色
- (NSArray *)getColoures{
    
    NSMutableArray * array = [NSMutableArray new];
    
    UIColor * redcolour = [UIColor colorWithHue:136.0 saturation:1.0 brightness:1.0 alpha:1];

    //同一种颜色的不同饱和度（这里取4种）
    for (int i = 0; i < 4; i++) {
        
        CGFloat hue = 0.0;

        CGFloat saturation = 0.0;
        
        CGFloat brightness = 0.0;
        
        CGFloat alpha = 0.0;

        
        [redcolour getHue:&hue saturation:&saturation brightness:&brightness alpha:&alpha];
        UIColor * newColour = [UIColor colorWithHue:hue saturation: saturation - (i*0.25) brightness:brightness alpha:alpha];
        
        NSLog(@"%f,%f,%f,%f",hue,saturation,brightness,alpha);

        [array addObject:newColour];
    }
    
    return array;
}