title: Random images error
body: <p>I'm making an app that when you press a button it give you a random image. When I run it I don't get any error, but when I click on the button the app freeze and on xcode it says "Thread 1: breakpoint 1.1" at the end of this code right here:</p>
  
  <pre><code>-(void)changeLabel{
  
      progressView.progress += 0.15;
  
      if (progressView.progress == 1) {
  
          label.hidden = YES;
  
          progressView.hidden = YES;
  
          [timer invalidate];
  
          imagenesTest.hidden = NO;
  
  
           int randomNumber = arc4random() % 4;
  
          switch (randomNumber) {
  
              case 0:
  
                  imagenesTest.image = [UIImage imageNamed:@"image1.png"];
  
                  break;
              case 1:
  
                  imagenesTest.image = [UIImage imageNamed:@"image2.png"];
  
                  break;
              case 2:
  
                  imagenesTest.image = [UIImage imageNamed:@"image3.png"];
                  break;
  
              case 3:
  
                  imagenesTest.image = [UIImage imageNamed:@"image4.png"];
           default:
                  break;
  }
  }
  }
  </code></pre>
  
  <p>When I press a button it supposed to active a progress bar and then put the random image. It gives the error before the progress bar starts working. Here is the code I have for the button:</p>
  
  <pre><code>- (IBAction)scan:(id)sender {
  
  
  
      label.hidden = NO;
  
      imagenesTest.hidden = YES;
  
  
  
      progressView.hidden = NO;
  
  
      progressView.progress = 0;
  
  
  
      timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeLabel) userInfo:nil repeats:YES];
  
  
  
  }
  </code></pre>
  
  <p>When I click on the thread, it highlights me this</p>
  
  <pre><code>0x94feb6:  jmp    0x3ef05 
                    ; -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 4724
  </code></pre>
  
  <p>Am I doing something wrong with the code? Sorry if I didn't explain myself well, I started programming a some months ago</p>
  
  <p>Thank you, Emilio</p>