show placeholder if downloaded data is not an image

jakemarsh · Oct 24, 2012 · dae7785 · dae7785
1 parent 9522274
commit dae7785
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/JMImageCache.m b/JMImageCache.m
@@ -70,7 +70,9 @@ - (void) _downloadAndWriteImageForURL:(NSURL *)url key:(NSString *)key completio
  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  NSData *data = [NSData dataWithContentsOfURL:url];
  UIImage *i = [[UIImage alloc] initWithData:data];
-
+ // stop process if the method could not initialize the image from the specified data
+ if (!i) return;
+
  NSString *cachePath = cachePathForKey(key);
  NSInvocation *writeInvocation = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:@selector(writeData:toPath:)]];