title: iOS App: Terminated due to memory issue [Related to swiftSlowAlloc or UIImage]
body: <p>Currently I am facing a memory issue problem in building iOS app. I checked for Memory leaks using Instruments. I found that there is one kind of leaks that keeps on showing up named swift_slowAlloc, which I don't have idea about. An snippet of the error is given below. </p>
  
  <p><a href="https://i.stack.imgur.com/JBe1r.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/JBe1r.jpg" alt="Memory Leaks"></a></p>
  
  <p>Another reason I think could happen is due to loading of several UIImages in my app. Just to provide a background, I take various portions of an original image in my app and do some processing on them. However, I don't need to keep the images for further calculations. I used autoreleasepool to release the UIImage; but I doubt that it is working. An example is given below:</p>
  
  <pre><code>   @autoreleasepool {
  
          UIImage *imageResized = MatToUIImage(resized28);
  
          // MARK: Send resized28 to CNN and get the output. Fill the dict then
  
          NSString *CNNScore;
          CNNScore = [myclass CNNfloat:imageResized W1:W1 W2:W2 Wf1:Wf1 Wf2:Wf2 B1:B1 B2:B2 Bf1:Bf1 Bf2:Bf2];
  
          imageResized = nil;
          xtn = [NSNumber numberWithInteger:xt];
          xbn = [NSNumber numberWithInteger:xb];
          ytn = [NSNumber numberWithInteger:yt];
          ybn = [NSNumber numberWithInteger:yb];
  
          symbol = [NSString stringWithFormat:@"%@", CNNScore];
          symtype = [NSString stringWithFormat:@"%@", [scoreDic objectForKey: symbol]];
  
          numberInDict = [NSString stringWithFormat:@"%i", n];
  
  
          inToMaroof = [NSArray arrayWithObjects: xtn, xbn, ytn, ybn, symbol,symtype, nil];
  
          [toMaroof setObject: inToMaroof
                       forKey: numberInDict];
          }
      }
  </code></pre>
  
  <p>Can someone suggest anything on this issue?</p>