button objective-c

   //// General Declarations
    CGContextRef context = UIGraphicsGetCurrentContext();
    //// Color Declarations
    UIColor *color = [UIColor colorWithRed:0.306 green:0.678 blue:0.604 alpha:1.0];
    UIColor *shadowColor = [UIColor colorWithRed:0.20 green:0.200 blue:0.200 alpha:1.0];

    NSShadow *shadow;
    shadow.shadowColor = [shadowColor colorWithAlphaComponent:0.72];
    shadow.shadowOffset = CGSizeMake(0.1, -0.1);
    shadow.shadowBlurRadius = 5;
    
    //// Rectangle Drawing
    CGRect rectangleRect = CGRectMake(52, 35, 140, 37);
    UIBezierPath *rectanglePath = [UIBezierPath bezierPathWithRoundedRect:rectangleRect cornerRadius:15];
    CGContextSaveGState(context);
    
    CGContextSetShadowWithColor(context, shadow.shadowOffset, shadow.shadowBlurRadius, shadowColor.CGColor);
    [color setFill];
    [rectanglePath fill];
    CGContextRestoreGState(context);
    
    NSString *rectangleTextContent = @"Take a picture";
    NSMutableParagraphStyle *rectangleStyle = (NSMutableParagraphStyle *)[[NSParagraphStyle defaultParagraphStyle]mutableCopy];
    rectangleStyle.alignment=NSTextAlignmentCenter;
    
    NSDictionary *rectangleFontAttributes = [[NSDictionary alloc] initWithObjectsAndKeys: [UIFont fontWithName:@"Range-SemiBold" size:15], NSFontAttributeName, [UIColor whiteColor], rectangleStyle, nil];
    CGFloat rectangleTextHeight = ([rectangleTextContent boundingRectWithSize:CGSizeMake(rectangleRect.size.width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:rectangleFontAttributes context:nil]).size.height;
    CGContextSaveGState(context);
    
    CGContextClipToRect(context, rectangleRect);
    [rectangleTextContent drawInRect:CGRectMake(rectangleRect.origin.x, rectangleRect.origin.y + (rectangleRect.size.height - rectangleTextHeight) / 2, rectangleRect.size.width, rectangleTextHeight) withAttributes:rectangleFontAttributes];
    CGContextRestoreGState(context);