`editable` property was implemented for RCTUITextField

Summary: `UITextField` surprisingly does not have `editable` property (only UITextView does), so we have to implement it ourselfs.

Reviewed By: javache

Differential Revision: D5153070

fbshipit-source-id: 5a76c623fc5c7c3eec10c600c942cf82c93833cd

Libraries/Text/RCTUITextField.h

@@ -22,6 +22,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, assign, readonly) BOOL textWasPasted;
 @property (nonatomic, strong, nullable) UIColor *placeholderColor;
 @property (nonatomic, assign) UIEdgeInsets textContainerInset;
+@property (nonatomic, assign, getter=isEditable) BOOL editable;
 
 @end
 

Libraries/Text/RCTUITextField.m

@@ -71,6 +71,16 @@
                                                                attributes:attributes];
 }
 
+- (BOOL)isEditable
+{
+  return self.userInteractionEnabled;
+}
+
+- (void)setEditable:(BOOL)editable
+{
+  self.userInteractionEnabled = editable;
+}
+
 #pragma mark - Caret Manipulation
 
 - (CGRect)caretRectForPosition:(UITextPosition *)position