我使用此方法将图像调整为原始尺寸的两倍:-(UIImage*)doubleSizeImage:(UIImage*)image{CGSizenewSize=CGSizeMake(image.size.width*2,image.size.height*2);UIGraphicsBeginImageContext(newSize);CGContextSetInterpolationQuality(UIGraphicsGetCurrentContext(),kCGInterpolationHigh);[imagedrawInRect:CGRectMake(0,0,newSize.width,

尝试使用以下代码将图像调整为缩略图，出现错误:Useofunresolvedidentifier对于kCGInterpolationHigh@IBActionfuncdropPhoto(sender:AnyObject){presentViewController(imagePicker,animated:true,completion:nil)}funcimagePickerController(picker:UIImagePickerController,didFinishPickingImageimage:UIImage,editingInfo:[String:AnyObject