Simple way how to achieve Radial Gradient View in Objective-C

RadialGradientView.h

#import <UIKit/UIKit.h>

@interface RadialGradientView : UIView

@end

RadialGradientView.m

#import "RadialGradientView.h"

@implementation RadialGradientView

- (void)drawRect:(CGRect)rect
{
    CGContextRef currentContext = UIGraphicsGetCurrentContext();
  
    CGGradientRef glossGradient;
    CGColorSpaceRef rgbColorspace;
    size_t num_locations = 2;
    CGFloat locations[2] = { 0.0, 1.0 };
    CGFloat components[8] = {
		0.1, 0.1, 0.1, 1,  // Start color
		0.00, 0.00, 0.00, 1   // End color
	};
	
    rgbColorspace = CGColorSpaceCreateDeviceRGB();
    glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);
	
    CGRect currentBounds = self.bounds;
    CGPoint midCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMidY(currentBounds));
	
	CGContextDrawRadialGradient(currentContext, glossGradient, midCenter, 0, midCenter, 400, kCGGradientDrawsBeforeStartLocation);
	
    CGGradientRelease(glossGradient);
    CGColorSpaceRelease(rgbColorspace);
}

@end