UIImagePickerControllerEditedImage得到nil

时间:2013-12-09 06:23:34

标签: ios objective-c uiimagepickercontroller

嘿伙计们我正在使用UIImagePickerController进行一些图像编辑。以下是imagePickerController:didFinishPickingMediaWithInfo中的一些代码:

    UIImage *editedImg = [info objectForKey:UIImagePickerControllerEditedImage];
    UIImageView *imgView = [[UIImageView alloc] initWithImage:editedImg];
    CGRect imgFrm = imgView.frame;
    float rate = imgFrm.size.height / imgFrm.size.width;
    imgFrm.size.width = size;
    imgFrm.size.height = size * rate;
    imgFrm.origin.x = 0;
    imgFrm.origin.y = (size - imgFrm.size.height) / 2;
    [imgView setFrame:imgFrm];

    UIView *cropView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size, size)];
    [cropView setBackgroundColor:[UIColor blackColor]];
    [cropView addSubview:imgView];

    UIImage *croppedImg = [MyUtil createUIImageFromUIView:cropView];

以上是在尺寸*尺寸视图中设置图像,并在拾取器返回的图像高度小于尺寸时从视图中绘制图像。

以下是createUIImageFromUIView:(UIView*)view的代码:

+ (UIImage *)createUIImageFromUIView:(UIView *)view
{

    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 2.0);

    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:ctx];

    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return viewImage;
}

我的问题是:调试时,'editedImg'(在第一行中定义)只显示'nil'。但是,以下代码运行良好。我得到了corpView(也显示'nil')正确并获得裁剪图像,并可以将其编码为base64编码的字符串,以便发送到服务器端。 我只是想知道为什么editedImg是nil(由[info objectForKey:UIImagePickerControllerEditedImage]返回),但是当我选择在调试模式下打印信息时,控制台中的输出不是nil? < / p>

3 个答案:

答案 0 :(得分:1)

editdImg获取nil,尝试:

UIImage *editedImg = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

获取文件大小:

- (long long) fileSizeAtPath:(NSString*) filePath{
  NSFileManager* manager = [NSFileManager defaultManager];
  if ([manager fileExistsAtPath:filePath]){
      return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
  }
  return 0;
}

祝福!

答案 1 :(得分:0)

您可以通过

获取裁剪的图像尺寸
UIImage *croppedImg = [MyUtil createUIImageFromUIView:cropView];
NSData *dataForImage = UIImagePNGRepresentation(croppedImg);

现在你可以检查长度

if (dataForImage.length)
{

}

答案 2 :(得分:0)

经过一番搜索,我偶然发现了这个:string value always shows nil in objective-c

这就是为什么我总是在调试模式下看到'nil'而代码运行良好的原因。