Fix torch issue.

@@ -570,21 +570,8 @@
         [self toastTip:@"前置摄像头不存在闪光灯。"];
         return;
     }
-    
-    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
-
+    [_livePush toggleTorch:!sender.selected];
     sender.selected = !sender.selected;
-
-    if ([device hasTorch] && [device hasFlash]){
-        
-        [device lockForConfiguration:nil];
-        if (sender.selected) {
-            [device setTorchMode:AVCaptureTorchModeOn];
-        } else {
-            [device setTorchMode:AVCaptureTorchModeOff];
-        }
-        [device unlockForConfiguration];
-    }
 }
 
 - (void)liveButtonPressed:(UIButton *)sender {