Question

我想从UIImagePickerControllerSourceTypePhotoLibrary获取图像，在从图像库中选择图像之前，我想知道该特定图像的内存大小。我正在使用

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{   

    UIImage * img = [info objectForKey:@"UIImagePickerControllerEditedImage"];
    size_t imageSize = CGImageGetBytesPerRow(img.CGImage) * CGImageGetHeight(img.CGImage);
    printf("\n the image size is :%zd",imageSize);
    [self useImage:img];
    [[picker parentViewController] dismissModalViewControllerAnimated:NO];
    UINavigationController* navController = self.navigationController;
    UIViewController* controller = [navController.viewControllers objectAtIndex:0];
    [controller dismissModalViewControllerAnimated:NO];


}

这里我正在计算的图像尺寸不正确，图像库中的图像尺寸究竟与我正在计算的图像尺寸不同。我想在选择图像之前知道图像大小谁能帮我提前致谢

Answer 1

哟可以用JPEG格式获取所选图像的大小：

UIImage * img = [info objectForKey:@"UIImagePickerControllerEditedImage"];
NSData *imageData = UIImageJPEGRepresentation(img, 1.0);
yourImgSize = [imageData length];

或PNG格式

UIImage * img = [info objectForKey:@"UIImagePickerControllerEditedImage"];
NSData *imageData = UIImagePNGRepresentation(img, 1.0);
yourImgSize = [imageData length];

修改

它将以字节为单位，你可以认为有用的除以1024，直到你得到你想要的单位

如何在选择之前获取UIImage选择器控制器中的图像大小？

1 个答案: