UISlider底部滑动条颜色渐变

代码实现- (void)viewDidLoad {    [super viewDidLoad];    self.slider = [[UISlider alloc]initWithFrame:CGRectMake(100, 100, 200, 55)];    [self.view addSubview:self.slider];    UIColor *startColor = [UIColor colorWithRed:190.0/255 green:253.0/255 blue:255.0/255 alpha:1.0];    UIColor *endColor = [UIColor colorWithRed:0.0/255 green:222.0/255 blue:255.0/255 alpha:1.0];    NSArray *colors = @[startColor,endColor];    UIImage *img = [self getGradientImageWithColors:colors imgSize:self.slider.bounds.size];    [self.slider setMinimumTrackImage:img forState:UIControlStateNormal];}-(UIImage *)getGradientImageWithColors:(NSArray*)colors imgSize:(CGSize)imgSize{    NSMutableArray *arRef = [NSMutableArray array];    for(UIColor *ref in colors) {        [arRef addObject:(id)ref.CGColor];    }    UIGraphicsBeginImageContextWithOptions(imgSize, YES, 1);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSaveGState(context);    CGColorSpaceRef colorSpace = CGColorGetColorSpace([[colors lastObject] CGColor]);    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)arRef, NULL);    CGPoint start = CGPointMake(0.0, 0.0);    CGPoint end = CGPointMake(imgSize.width, imgSize.height);    CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    CGGradientRelease(gradient);    CGContextRestoreGState(context);    CGColorSpaceRelease(colorSpace);    UIGraphicsEndImageContext();    return image;}

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