直播软件开发，渐变色任务进度条

直播软件开发，渐变色任务进度条实现的相关代码

   [_slider setMinimumTrackImage:getGradientImageWith(@[LightBlue3,BLUECOLOR], CGRectMake(0, 0, ScreenWidth - 75 * rectScale(), 10 * rectScale()), CGPointMake(0, 0.5), CGPointMake(1, 0.5)) forState:UIControlStateNormal];
UIImage* getGradientImageWith(NSArray *colors,CGRect rect,CGPoint start,CGPoint end){
    if (!colors.count || CGRectEqualToRect(rect, CGRectZero)) {
        return nil;
    }
    
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    
    gradientLayer.frame = rect;
    gradientLayer.startPoint = start;
    gradientLayer.endPoint = end;
    NSMutableArray *mutColors = [NSMutableArray arrayWithCapacity:colors.count];
    for (UIColor *color in colors) {
        [mutColors addObject:(__bridge id)color.CGColor];
    }
    gradientLayer.colors = [NSArray arrayWithArray:mutColors];
    
    UIGraphicsBeginImageContextWithOptions(gradientLayer.frame.size, gradientLayer.opaque, 0);
    [gradientLayer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return outputImage;
}

​ 

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