Попробуй это. Это работает, если вы используете заголовки сегментов, вам может потребоваться изменить его, если вы используете изображения.
segControl.segmentedControlStyle = UISegmentedControlStyleBar;
[segControl addTarget:self action:@selector(changeColors:) forControlEvents:UIControlEventValueChanged];
-(IBAction)changeColors:(UISegmentedControl *)sc{
for (int i=0; i<sc.numberOfSegments; i++) {
// reset all the titles in the segmented control
[sc setTitle:[NSString stringWithFormat:@"%i", i] forSegmentAtIndex:i];
}
if (sc.selectedSegmentIndex < 0 || sc.selectedSegmentIndex >= sc.numberOfSegments) {
return;
}
CGFloat width = sc.frame.size.width / sc.numberOfSegments - 1;
CGRect rect = CGRectMake(0, 0, width, sc.frame.size.height - 2);
UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);
CGContextRef ctx = UIGraphicsGetCurrentContext();
// background gradient
UIColor *colorOne = [UIColor colorWithWhite:0.6 alpha:1.0]; //top of gradient
UIColor *colorTwo = [UIColor colorWithWhite:0.4 alpha:1.0]; //bottom of gradient
NSArray *colors = [NSArray arrayWithObjects:(id)colorOne.CGColor, (id)colorTwo.CGColor, nil];
CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
CGGradientRef gradient = CGGradientCreateWithColors(space, (__bridge CFArrayRef)colors, NULL);
CGContextDrawLinearGradient(ctx, gradient, CGPointMake(0,0), CGPointMake(0,rect.size.height), 0);
// black shadow at the top
colors = [NSArray arrayWithObjects:(id)[UIColor colorWithWhite:0.0 alpha:0.3].CGColor, (id)[UIColor clearColor].CGColor, nil];
gradient = CGGradientCreateWithColors(space, (__bridge CFArrayRef)colors, NULL);
CGContextDrawLinearGradient(ctx, gradient, CGPointMake(0,0), CGPointMake(0,2.0), 0);
UILabel * title = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, sc.frame.size.height - 4)];
title.text = [sc titleForSegmentAtIndex:sc.selectedSegmentIndex];
title.font = [UIFont fontWithName:@"Helvetica-Bold" size:12.0];
title.textAlignment = UITextAlignmentCenter;
title.textColor = [UIColor whiteColor];
title.backgroundColor = [UIColor clearColor];
title.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
title.shadowOffset = CGSizeMake(0, -0.5);
[title.layer renderInContext:ctx];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[sc setImage:img forSegmentAtIndex:sc.selectedSegmentIndex];
}