My Background Assets extension arranges to download image resources, as follows:
NSURL *assetURL = [NSURL URLWithString:@"https://***.png”];
NSUInteger assetSize = 6849;
switch (contentRequest) {
case BAContentRequestInstall:
case BAContentRequestUpdate:
{
BAURLDownload *essentialDownload = [[BAURLDownload alloc] initWithIdentifier:@"YYBADAsset"
request:[NSURLRequest requestWithURL:assetURL]
essential:true
fileSize:assetSize
applicationGroupIdentifier:appGroupIdentifier
priority:BADownloaderPriorityDefault];
[downloadsToSchedule addObject:essentialDownload];
break;
}
}
At the same time, the finishedWithFileURL method is implemented as follows:
- (void)backgroundDownload:(BADownload *)download finishedWithFileURL:(NSURL *)fileURL
{
NSLog(@"BackgroundAssetsTest extension finishedWithFileURL:%@ forDownlad:%@",fileURL,download.identifier);
NSLog(@"BackgroundAssetsTest extension finishedWithManifestURLExist:%@",@([[NSFileManager defaultManager] fileExistsAtPath:fileURL.absoluteString]));
}
And then use tools to trigger events,
xcrun backgroundassets-debug --app-bundle-id com.luph.mytest --device-id 00008020-000A04xxF0002E --simulate --app-install
The following log is observed through the console:
BackgroundAssetsTest extension finishedWithFileURL:file:///private/var/mobile/Containers/Shared/AppGroup/1D051E06-E597-4670-969A-38ECA52C4F7A/Library/C aches/com.apple.BackgroundAssets/BAFile-5152AFB2.tmp forDownlad:YYBADAsset
BackgroundAssetsTest extension finishedWithManifestURLExist:0
What's the problem? Did I set the size of BAURLDownload to be different from the actual download size? Or the wrong way to determine the existence of the file?
Instead of:
[[NSFileManager defaultManager] fileExistsAtPath:fileURL.absoluteString]
Use:
[[NSFileManager defaultManager] fileExistsAtPath:fileURL.path]
absoluteString will create a string that includes the URL's scheme (i.e. file:///path/to/file), which will not work with [NSFileManager fileExistsAtPath].
