Fix field focus infinite recursion in keyboardWillShow on > RN 45

Fixes #408

React-Native removed support for the react(Will|Did)MakeFirstResponder APIs in this commit: facebook/react-native@bc1ea54#diff-3e154f92c7ba4cb47e96785b9dadf3aa

ios/TPSStripe/TPSCardField.m

@@ -12,10 +12,11 @@ @interface TPSCardField () <STPPaymentCardTextFieldDelegate>
 @end
 
 @implementation TPSCardField {
+    // Relates to a Deprecated API -- clean this up after RN 0.45 or lower support is dropped
     BOOL _jsRequestingFirstResponder;
     BOOL _isFirstResponder;
-    STPPaymentCardTextField *_paymentCardTextField;
 
+    STPPaymentCardTextField *_paymentCardTextField;
 }
 
 - (void)dealloc {
@@ -30,10 +31,10 @@ - (instancetype)initWithFrame:(CGRect)frame {
         [self addSubview:_paymentCardTextField];
         self.backgroundColor = [UIColor clearColor];
         [[NSNotificationCenter defaultCenter]
-            addObserver:self
-               selector:@selector(keyboardWillShow:)
-                   name:UIKeyboardWillShowNotification
-                 object:self.window];
+         addObserver:self
+         selector:@selector(keyboardWillShow:)
+         name:UIKeyboardWillShowNotification
+         object:self.window];
     }
     return self;
 }
@@ -43,6 +44,23 @@ - (void)reactSetFrame:(CGRect)frame {
     _paymentCardTextField.frame = self.bounds;
 }
 
+- (void)reactFocus {
+    _jsRequestingFirstResponder = YES;
+    [self becomeFirstResponder];
+}
+
+- (void)reactFocusIfNeeded {
+    if (!_isFirstResponder) {
+        [self reactFocus];
+    }
+}
+
+- (void)reactBlur {
+    _jsRequestingFirstResponder = NO;
+    [self resignFirstResponder];
+}
+
+// Deprecated API -- removed in 2017, clean this up after RN 0.45 or lower support is dropped
 - (void)reactWillMakeFirstResponder {
     _jsRequestingFirstResponder = YES;
 }
@@ -51,6 +69,7 @@ - (BOOL)canBecomeFirstResponder {
     return _jsRequestingFirstResponder;
 }
 
+// Deprecated API -- removed in 2017, clean this up after RN 0.45 or lower support is dropped
 - (void)reactDidMakeFirstResponder {
     _jsRequestingFirstResponder = NO;
 }
@@ -74,6 +93,7 @@ - (BOOL)becomeFirstResponder {
 }
 
 - (BOOL)resignFirstResponder {
+    _jsRequestingFirstResponder = NO;
     _isFirstResponder = NO;
     return [_paymentCardTextField resignFirstResponder];
 }
@@ -179,11 +199,11 @@ - (void)setCardParams:(STPPaymentMethodCardParams *)cardParams {
 }
 
 - (UIKeyboardAppearance)keyboardAppearance {
-  return _paymentCardTextField.keyboardAppearance;
+    return _paymentCardTextField.keyboardAppearance;
 }
 
 - (void)setKeyboardAppearance:(UIKeyboardAppearance)keyboardAppearance {
-  _paymentCardTextField.keyboardAppearance = keyboardAppearance;
+    _paymentCardTextField.keyboardAppearance = keyboardAppearance;
 }
 
 #pragma mark - STPPaymentCardTextFieldDelegate