沙箱用SBElementArray打破了NSPredicate

Question

我正试图在沙盒应用程序中使用脚本桥从iTunes中过滤出一组曲目。以下代码在应用程序未被沙箱保护时有效，但在沙箱保护时无效：

if(!self.iTunes){
    self.iTunes = [SBApplication applicationWithBundleIdentifier:@"com.apple.iTunes"];
    self.library = [[[[self.iTunes sources] get] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"kind == %i", iTunesESrcLibrary]] objectAtIndex:0];
    iTunesLibraryPlaylist *libraryPlaylist = [[[[self.library playlists] get] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"specialKind == %i", iTunesESpKMusic]] objectAtIndex:0];
    self.musicTracks = [libraryPlaylist tracks];
}

// Create the playlist in iTunes
NSString *playlistName = selectedEquation.name;
iTunesPlaylist *playlist = [[[self.iTunes classForScriptingClass:@"playlist"] alloc] init];
[[self.library userPlaylists] insertObject:playlist atIndex:0];
[playlist setName:playlistName];


// Use persistent id to match between iTunesLibrary and ScriptingBridge
NSArray* iDArray = [self.tableTracks valueForKey:@"persistentID"];
for (NSNumber *decID in iDArray){
    NSString* hexID = [NSString stringWithFormat:@"%llx", (long long)[decID integerValue]];
    hexID = [hexID uppercaseString];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K == %@", @"persistentID", hexID];
    [[[self.musicTracks filteredArrayUsingPredicate:predicate] objectAtIndex:0] duplicateTo:playlist];
}

这是一个bug，还是我漏掉了什么？如果我在运行筛选器之前将self.musicTracks转换为NSArray，它将会起作用。然而，这会极大地减慢速度，以至于它实际上无法使用。

编辑:这是我的授权文件。我当然可以添加播放列表和曲目--只是过滤不再起作用了。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.security.app-sandbox</key>
    <true/>
    <key>com.apple.security.assets.music.read-write</key>
    <true/>
    <key>com.apple.security.scripting-targets</key>
    <dict>
        <key>com.apple.iTunes</key>
        <array>
            <string>com.apple.iTunes.library.read-write</string>
        </array>
    </dict>
</dict>
</plist>

Answer 1

看，一个变通方法！

NSArray* sbIDs = [self.musicTracks arrayByApplyingSelector:@selector(persistentID)];
// Use persistent id to match between iTunesLibrary and ScriptingBridge
NSArray* iDArray = [self.tableTracks valueForKey:@"persistentID"];
for (NSNumber *decID in iDArray){
    NSString* hexID = [NSString stringWithFormat:@"%llx", (long long)[decID integerValue]];
    hexID = [hexID uppercaseString];
    // Persistent ID's have to have 16 characters in them.  Prepend zeros to make it so.
    while ([hexID length]<16) {
        hexID = [NSString stringWithFormat:@"%@%@", @"0", hexID];
    }
    NSInteger sbIndex = [sbIDs indexOfObject:hexID];
    [[self.musicTracks objectAtIndex:sbIndex] duplicateTo:playlist];
}

这不应该是答案，但它是有效的，而且很快。