UIView gradient inner border drawRect:

gistfile1.m

- (void)drawRect:(CGRect)rect
{
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:rect];
    //To create a 1.0f borderWidth
    CGRect innerRect = rect;
    innerRect.origin.x += 1.0f;
    innerRect.origin.y += 1.0f;
    innerRect.size.width -= 2.0f;
    innerRect.size.height -= 2.0f;
    UIBezierPath *innerPath = [UIBezierPath bezierPathWithRect:innerRect];
    
    [path appendPath:innerPath];
    path.usesEvenOddFillRule = YES;
    [path addClip];
    
    CGGradientRef gradient;
    CGColorSpaceRef colorspace;
    size_t num_locations = 2;
    CGFloat locations[2] = { 0.0, 1.0 };
    CGFloat components[8] = { 1.0, 0.0, 0.0, 1.0,  // Start color
        0.0, 1.0, 0.0, 1.0 }; // End color
    
    colorspace = CGColorSpaceCreateDeviceRGB();
    gradient = CGGradientCreateWithColorComponents (colorspace, components, locations, num_locations);
    CGContextAddPath(ctx, path.CGPath); 
    CGContextClip(ctx);        
    CGContextDrawLinearGradient (ctx, gradient, CGPointMake(-1.0f, 0.0f), CGPointMake(0.0f, 480.0f), 0);
    CGGradientRelease(gradient);
}