Question

我正在尝试在我的应用程序中拍摄照片并将它们保存到有两个日期的路径中（以指定拍摄照片的时间）。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image;
    image = [info objectForKey:UIImagePickerControllerOriginalImage];
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); //save to photo album
    NSString *pathString = [NSString stringWithFormat:@"Photos/%@/%@.png",timeStarted,[NSDate date]]; //create path
    NSString *savePath = [NSHomeDirectory() stringByAppendingPathComponent:pathString];
    //write the files!
    [UIImagePNGRepresentation(image) writeToFile:savePath atomically:YES];
}

当我检查文件夹@"Photos/%@",timeStarted时，它显示为空。我究竟做错了什么？

修改：

以下是我用于测试目的的新代码：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //Create the image and save it to the photo album
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

    //Create the directory and add the file name to it
    NSString *fileName = @"Test.png";
    NSString *directory = [NSHomeDirectory() stringByAppendingPathComponent:@"Photos"];
    NSString *fullPath = [directory stringByAppendingPathComponent:fileName];
    NSLog(@"Full path: %@", fullPath);

    //Save "image" to the file path
    [UIImagePNGRepresentation(image) writeToFile:fullPath atomically:YES];

    //START CHECKING : Log to check if anything was saved
    NSError *error;
    NSFileManager *fileMgr = [NSFileManager defaultManager];
    NSLog(@"Photos directory: %@", [fileMgr contentsOfDirectoryAtPath:directory error:&error]);
    //END CHECKING

    [camera dismissModalViewControllerAnimated:YES];
}

我的NSLog读到：

[640:707] Full path: /var/mobile/Applications/3EEDBD68-5496-458D-9EF0-062746847C83/Photos/Test.png
[640:707] Photos directory: (null)

Answer 1

您的pathString包含无效路径。如果NSLog你的路径字符串，它将看起来像这样

Photos/2011-11-16 20:16:16 +0000/2011-11-16 20:16:16 +0000.png

尝试使用常规路径（例如Photo.png）进行保存。如果这有效，则表明路径存在问题。在此之后尝试使用NSDateFormatter将日期输出为有效路径的字符串。

在应用程序保存中拍照

1 个答案: