Removed 'screen' option from snapshot API

Summary:Unfortunately the 'screen' option in the `UIManager.takeSnapshot` API appears to work only on the iOS simulator, not on an actual device.

This diff removes the 'screen' option until a solution can be found that works on the device.

(Taking a snapshot of the window still works fine - it just won't include the status bar, etc.)

Reviewed By: javache

Differential Revision: D2971091

fb-gh-sync-id: 026b9d4eb2f59f686f58c18a16381ff325df612b
shipit-source-id: 026b9d4eb2f59f686f58c18a16381ff325df612b

Examples/UIExplorer/SnapshotExample.js

@@ -44,7 +44,7 @@ var ScreenshotExample = React.createClass({
 
   takeScreenshot() {
     UIManager
-      .takeSnapshot('screen', {format: 'jpeg', quality: 0.8}) // See UIManager.js for options
+      .takeSnapshot('window', {format: 'jpeg', quality: 0.8}) // See UIManager.js for options
       .then((uri) => this.setState({uri}))
       .catch((error) => alert(error));
   }

Libraries/Utilities/UIManager.js

@@ -50,8 +50,8 @@ const _takeSnapshot = UIManager.takeSnapshot;
  * will be stored in a temporary file that will only exist for as long as the
  * app is running.
  * 
- * The `view` argument can be the literal string `screen` or `window` if you
- * want to capture the entire screen, or it can be a reference to a specific
+ * The `view` argument can be the literal string `window` if you want to
+ * capture the entire window, or it can be a reference to a specific
  * React Native component.
  *
  * The `options` argument may include:
@@ -63,7 +63,7 @@ const _takeSnapshot = UIManager.takeSnapshot;
  * @platform ios
  */
 UIManager.takeSnapshot = async function(
-  view ?: 'screen' | 'window' | ReactElement | number,
+  view ?: 'window' | ReactElement | number,
   options ?: {
     width ?: number;
     height ?: number;
@@ -75,8 +75,8 @@ UIManager.takeSnapshot = async function(
     console.warn('UIManager.takeSnapshot is not available on this platform');
     return;
   }
-  if (typeof view !== 'number' && view !== 'screen' && view !== 'window') {
-    view = findNodeHandle(view) || 'screen';
+  if (typeof view !== 'number' && view !== 'window') {
+    view = findNodeHandle(view) || 'window';
   }
   return _takeSnapshot(view, options);
 };

React/Modules/RCTUIManager.m

@@ -1191,9 +1191,7 @@ RCT_EXPORT_METHOD(takeSnapshot:(id /* NSString or NSNumber */)target
 
     // Get view
     UIView *view;
-    if (target == nil || [target isEqual:@"screen"]) {
-      view = [[UIScreen mainScreen] snapshotViewAfterScreenUpdates:YES];
-    } else if ([target isEqual:@"window"]) {
+    if (target == nil || [target isEqual:@"window"]) {
       view = RCTKeyWindow();
     } else if ([target isKindOfClass:[NSNumber class]]) {
       view = viewRegistry[target];
@@ -1217,7 +1215,7 @@ RCT_EXPORT_METHOD(takeSnapshot:(id /* NSString or NSNumber */)target
     UIGraphicsEndImageContext();
 
     if (!success || !image) {
-      reject(RCTErrorUnspecified, @"Failed to capture view snapshot", nil);
+      reject(RCTErrorUnspecified, @"Failed to capture view snapshot.", nil);
       return;
     }