Tint image before iOS 13

UIImage+Tint.swift

func tinted(withColor color: UIColor) -> UIImage {
    guard let maskImage = cgImage else {
      return self
    }
    
    let bounds = CGRect(origin: .zero, size: size)
    let renderer = UIGraphicsImageRenderer(size: size)
    
    return renderer.image { context in
      let cgContext = context.cgContext
      cgContext.clip(to: bounds, mask: maskImage)
      color.setFill()
      
      cgContext.fill(bounds)
    }
  }