直播軟體開發，漸變色任務進度條實現的相關程式碼

 [_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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