Swiftで空のimageViewをadd

        //空のImageViewを貼る
        var frame = CGRectMake(0,0,1000,1000)
        UIGraphicsBeginImageContext(frame.size)
        var context = UIGraphicsGetCurrentContext();
        CGContextSetFillColorWithColor(context,UIColor.whiteColor().CGColor);
        let uiImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        self.imageView = UIImageView(image:uiImage)
        self.baseUiView.addSubview(self.imageView)