diff options
| -rw-r--r-- | platform/darwin/src/MGLMapSnapshotter.mm | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLMapSnapshotter.mm b/platform/darwin/src/MGLMapSnapshotter.mm index 73db8ea151..a63fbfb0a2 100644 --- a/platform/darwin/src/MGLMapSnapshotter.mm +++ b/platform/darwin/src/MGLMapSnapshotter.mm @@ -108,6 +108,11 @@ const CGFloat MGLSnapshotterMinimumPixelSize = 64; - (void)startWithQueue:(dispatch_queue_t)queue completionHandler:(MGLMapSnapshotCompletionHandler)completion { + if (!mbgl::Scheduler::GetCurrent()) { + [NSException raise:NSInvalidArgumentException + format:@"startWithQueue:completionHandler: must be called from a thread with an active run loop."]; + } + if ([self isLoading]) { [NSException raise:NSInternalInconsistencyException format:@"Already started this snapshotter."]; |