UIBarButtonItem -背景图像，drawInRect和setBackgroundImage - Swift

Question

我试图将UIBarButtonItem的背景图像设置为我已经在应用程序中的其他地方成功显示的图像，但我得到了一个奇怪的伸展，我似乎无法解决。同时，我正试着把照片裁剪成一个圆圈。

下面是我的代码：

        var profileView : UIView = self.profilePhoto.valueForKey("view") as UIView
        var profileImage = (user.valueForKey("profile_photo") as UIImage)
        var width = profileView.bounds.size.width
        var size = CGSize(width: width, height: width)

        UIGraphicsBeginImageContextWithOptions(size, false, 1.0)
        UIBezierPath(roundedRect: profileView.bounds, cornerRadius: width / 2).addClip()
        profileImage.drawInRect(profileView.bounds)

        println("width: \(profileImage.size.width), height: \(profileImage.size.height)")
        // Show image without any cropping
        //self.profilePhoto.setBackgroundImage(profileImage, forState: UIControlState.Normal, barMetrics: UIBarMetrics.Default)
        self.profilePhoto.setBackgroundImage(UIGraphicsGetImageFromCurrentImageContext(), forState: UIControlState.Normal, barMetrics: UIBarMetrics.Default)
        UIGraphicsEndImageContext()

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Answer 1

尝尝这个

   self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIGraphicsGetImageFromCurrentImageContext(), style: UIBarButtonItemStyle.Plain, target: nil, action: nil)