Render gradient image

I shared how to draw a gradient layer before. Recently, there is a need to make a gradient navigation bar. If you draw a gradient layer to the navigation bar, it cannot cover the status bar, so you still need to use it [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"xxx"] forBarMetrics:UIBarMetricsDefault]on the backgroundImageView of the navigation bar. Method. Share a method of rendering a gradient image

- (UIImage*)imageWithColor:(NSArray *)colors withSize:(CGSize)size{
    UIGraphicsBeginImageContextWithOptions(size, YES, 1);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);
    NSMutableArray *ar = [NSMutableArray array];
    for (UIColor *c in colors) {
        [ar addObject:(id)c.CGColor];
    }
    
    CGColorSpaceRef colorSpace = CGColorGetColorSpace([[colors lastObject] CGColor]);
    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)ar, NULL);
    CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(size.width, 0), kCGGradientDrawsBeforeStartLocation|kCGGradientDrawsAfterEndLocation);
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    CGGradientRelease(gradient);
    CGContextRestoreGState(context);
    CGColorSpaceRelease(colorSpace);
    UIGraphicsEndImageContext();
    return theImage;
}

Draw a gradient layer