我正在构建一个iOS应用,该应用允许用户通过记录或从“相机胶卷”中选择视频来从UIImagePickerController上传视频,以及播放所选视频。我的问题是,我该如何继续参考以这种方式选择的视频?我想这样做,以便如果设备上仍然存在视频,我可以使用本地文件,而不是流式传输上传的文件。
什么时候
imagePickerController:didFinishPickingMediaWithInfo:
返回,URL在:
[info objectForKey:UIImagePickerControllerMediaURL];
格式为:“file:// localhost / private / var / mobile / Applications / /tmp//trim.z2vLjx.MOV”
我认为“/ tmp /”目录是临时的,因此不适合保存该位置的URL。
我可以通过ALAssetsLibrary在设备上获取所有视频,但是由于我无法区分它们,所以这对我没有帮助。我一直在尝试使用:
[result valueForProperty:ALAssetPropertyDate];
为了区分视频,但我需要一种从UIImagePickerController获取创建日期的方法,以使其有用。
最佳答案
我终于设法找到一个解决方案:
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];
if(CFStringCompare((CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
{
//Dismiss the media picker view
[picker dismissModalViewControllerAnimated:YES];
//Get the URL of the chosen content, then get the data from that URL
NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
NSData *webData = [NSData dataWithContentsOfURL:videoURL];
//Gets the path for the URL, to allow it to be saved to the camera roll
NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum (moviePath))
{
ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];
//The key UIImagePickerControllerReferenceURL allows you to get an ALAsset, which then allows you to get metadata (such as the date the media was created)
[lib assetForURL:[info objectForKey:UIImagePickerControllerReferenceURL] resultBlock:^(ALAsset *asset) {
NSLog(@"created: %@", [asset valueForProperty:ALAssetPropertyDate]);
} failureBlock:^(NSError *error) {
NSLog(@"error: %@", error);
}];
}
}
通常,通过更彻底地阅读文档来找到解决方案。希望这会在某些时候帮助别人。
关于ios - 如何跟踪UIImagePickerController创建/选择的媒体?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/8474058/