Switch to asynchronous loading of images

SVN: 27172

openbis-ipad/openBIS/openBIS/CISDOBDetailViewController.m

@@ -69,11 +69,11 @@
     // The detail item is now up-to-date. Update the user interface.
     if (!self.detailItem) return;
     
-    self.summaryHeaderLabel.text = [self.detailItem.summaryHeader description];
-    self.summaryLabel.text = [self.detailItem.summary description];
-    self.identifierLabel.text = [self.detailItem.identifier description];
+    self.summaryHeaderLabel.text = self.detailItem.summaryHeader;
+    self.summaryLabel.text = self.detailItem.summary;
+    self.identifierLabel.text = self.detailItem.identifier;
 
-    if (self.detailItem.image) {
+    if (self.imageView.image != self.detailItem.image) {
         self.imageView.image = self.detailItem.image;
     }
     

openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.m

@@ -91,12 +91,15 @@
 #pragma mark - Server Communication
 - (void)syncSelectedObjectOnSuccess:(SuccessBlock)success
 {
-    // Update the image
-    if (_selectedObject.imageUrl) {
-        NSURL *imageUrl = [NSURL URLWithString: _selectedObject.imageUrl];
-        NSData *imageData = [NSData dataWithContentsOfURL: imageUrl];
-        _selectedObject.image = [UIImage imageWithData: imageData];
-        success(_selectedObject);
+    // Load the image if necessary
+    if (_selectedObject.imageUrl && !_selectedObject.image) {
+        NSBlockOperation *blockOp = [NSBlockOperation blockOperationWithBlock:  ^{
+            NSURL *imageUrl = [NSURL URLWithString: _selectedObject.imageUrl];
+            NSData *imageData = [NSData dataWithContentsOfURL: imageUrl];
+            _selectedObject.image = [UIImage imageWithData: imageData];
+            success(_selectedObject);
+        }];
+        [blockOp start];        
     } else {
         success(_selectedObject);
     }