SafeAreaView: Custom description method extended with inset values

Summary:
That should help with debugging SafeAreaView-related issues (esp. to see the info inside view hierarchy recursive description).

Changelog: [Internal]

Reviewed By: JoshuaGross

Differential Revision: D19539216

fbshipit-source-id: 1bee481c2766ad2d130e435582876d9f5ed27b3c

React/Views/SafeAreaView/RCTSafeAreaView.m

@@ -30,6 +30,21 @@
 RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)decoder)
 RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
 
+- (NSString *)description
+{
+  NSString *superDescription = [super description];
+
+  // Cutting the last `>` character.
+  if (superDescription.length > 0 && [superDescription characterAtIndex:superDescription.length - 1] == '>') {
+    superDescription = [superDescription substringToIndex:superDescription.length - 1];
+  }
+
+  return [NSString stringWithFormat:@"%@; safeAreaInsets = %@; appliedSafeAreaInsets = %@>",
+          superDescription,
+          NSStringFromUIEdgeInsets([self safeAreaInsetsIfSupportedAndEnabled]),
+          NSStringFromUIEdgeInsets(_currentSafeAreaInsets)];
+}
+
 - (BOOL)isSupportedByOS
 {
   return [self respondsToSelector:@selector(safeAreaInsets)];