彩带条实现

#pragma mark - createLayer
//加上这句 set方法
@property (nonatomic, assign) CGFloat progress;

CAShapeLayer *_progressLayer;
UIBezierPath *_progressPath;
CALayer * _maskLayer;
CAGradientLayer *_gradlayer;

//该方法是在自定义view中实现
- (void)createLayerWithView:(UIView *)view
{
//    _progressLayer = [CAShapeLayer layer];
//    _progressLayer.fillColor = nil;
//    _progressLayer.lineCap = kCALineCapRound;
//    _progressLayer.frame = view.bounds;
//    _progressLayer.lineWidth = 10;
//    _progressLayer.strokeColor = [UIColor orangeColor].CGColor;
//    [view.layer addSublayer:_progressLayer];
//    
//    _progressPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(view.bounds.size.width/2, view.bounds.size.height/2) radius:(view.bounds.size.width - 1)/2+1 startAngle:M_PI endAngle:3*M_PI clockwise:YES];
//    _progressLayer.path = _progressPath.CGPath;
//    _progressLayer.strokeEnd = 1;
//    
//    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
//    pathAnimation.duration = 3.0;
//    pathAnimation.repeatCount = MAXFLOAT;
//    pathAnimation.fromValue = @(0);
//    pathAnimation.toValue = @(1);
//    pathAnimation.removedOnCompletion = NO;
//    pathAnimation.fillMode = kCAFillModeForwards;
//    pathAnimation.autoreverses = NO; // yes 会回到起点
    
//    CABasicAnimation *pathAnimation2 = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
//    pathAnimation2.duration = 7.0;
//    pathAnimation2.repeatCount = MAXFLOAT;
//    pathAnimation2.fromValue = @(0.3);
//    pathAnimation2.toValue = @(1);
//    pathAnimation2.removedOnCompletion = NO;
//    pathAnimation2.fillMode = kCAFillModeForwards;
//    pathAnimation2.autoreverses = NO; // yes 会回到起点
//    pathAnimation2.beginTime = 3.0;
    
//    CAAnimationGroup *group = [CAAnimationGroup animation];
//    group.duration = 10;
//    group.removedOnCompletion = NO;
//    group.fillMode = kCAFillModeForwards;
//    group.repeatCount = MAXFLOAT;
//    group.autoreverses = NO;
//    group.animations = @[pathAnimation];
//    
//    [_progressLayer addAnimation:group forKey:@"circle"];
    
    // 彩带条
    _gradlayer = [CAGradientLayer layer];
    _gradlayer.frame = CGRectMake(0, 0, view.frame.size.width, 10);
    [_gradlayer setStartPoint:CGPointMake(0.0, 0.5)];
    [_gradlayer setEndPoint:CGPointMake(1.0, 0.5)];
    
    NSMutableArray *colorAry = [NSMutableArray array];
    for (NSInteger hue = 0; hue <= 360; hue += 5)
    {
        UIColor *color = [UIColor colorWithHue:1.0*hue/360.0 saturation:1.0 brightness:1.0 alpha:1.0];
        [colorAry addObject:(id)[color CGColor]];
    }
    
    [_gradlayer setColors:[NSArray arrayWithArray:colorAry]];
    
    [view.layer addSublayer:_gradlayer];
    
    _maskLayer = [CALayer layer];
    [_maskLayer setFrame:CGRectMake(0, 0, view.frame.size.width, 10)];
    [_maskLayer setBackgroundColor:[[UIColor blackColor] CGColor]];
    [_gradlayer setMask:_maskLayer];
    
    //Start the animation
    [self performAnimation];
    
    [self performSelector:@selector(gradualProgress) withObject:nil afterDelay:1];
}

- (void)gradualProgress
{
    self.progress += 0.1;
    
    if (self.progress >= 1.0)
    {
        self.progress = 1;
        //        return;
    }
    
    [self performSelector:@selector(gradualProgress) withObject:nil afterDelay:0.3];
}

- (void)layoutSubviews
{
    CGRect maskRect = [_maskLayer frame];
    maskRect.size.width = CGRectGetWidth([self bounds]) * self.progress;
    [_maskLayer setFrame:maskRect];
}

- (void)setProgress:(CGFloat)value
{
    if (_progress != value)
    {
        _progress = MIN(1.0, fabs(value));
        [self setNeedsLayout];
    }
}

- (void)performAnimation
{
    NSMutableArray * colorArray = [[_gradlayer colors] mutableCopy];
    UIColor * lastColor = [colorArray lastObject];
    [colorArray removeLastObject];
    [colorArray insertObject:lastColor atIndex:0];
    NSArray * shiftedColors = [NSArray arrayWithArray:colorArray];
    
    [_gradlayer setColors:shiftedColors];
    
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"colors"];
    [animation setToValue:shiftedColors];
    [animation setDuration:0.08];
    [animation setFillMode:kCAFillModeForwards];
    [animation setDelegate:self];
    [_gradlayer addAnimation:animation forKey:@"animateGradient"];
}

- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)flag
{
    [self performAnimation];
}



//使用方法
#warning CALayer test
    [self createLayerWithView:showMoneyBackView];