Implements web view for presenting Auth web content on iOS 7 and 8. (#253)

Also (hopefully) fixes thread safety issues in presenting Auth web content.

1 files changed, 86 insertions, 0 deletions

diff --git a/Firebase/Auth/Source/FIRAuthWebView.m b/Firebase/Auth/Source/FIRAuthWebView.m
new file mode 100644
index 0000000..80b90f0
--- /dev/null
+++ b/Firebase/Auth/Source/FIRAuthWebView.m
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FIRAuthWebView.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation FIRAuthWebView
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    self.backgroundColor = [UIColor whiteColor];
+    [self initializeSubviews];
+  }
+  return self;
+}
+
+/** @fn initializeSubviews
+    @brief Initializes the subviews of this view.
+ */
+- (void)initializeSubviews {
+  UIWebView *webView = [self createWebView];
+  UIActivityIndicatorView *spinner = [self createSpinner];
+
+  // The order of the following controls z-order.
+  [self addSubview:webView];
+  [self addSubview:spinner];
+
+  [self layoutSubviews];
+  _webView = webView;
+  _spinner = spinner;
+}
+
+- (void)layoutSubviews {
+  CGFloat height = self.bounds.size.height;
+  CGFloat width = self.bounds.size.width;
+  _webView.frame = CGRectMake(0, 0, width, height);
+  _spinner.center = _webView.center;
+}
+
+/** @fn createWebView
+    @brief Creates a web view to be used by this view.
+    @return The newly created web view.
+ */
+- (UIWebView *)createWebView {
+  UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectZero];
+  // Trickery to make the web view not do weird things (like showing a black background when
+  // the prompt in the navigation bar animates changes.)
+  webView.opaque = NO;
+  webView.backgroundColor = [UIColor clearColor];
+  webView.scrollView.opaque = NO;
+  webView.scrollView.backgroundColor = [UIColor clearColor];
+  webView.scrollView.bounces = NO;
+  webView.scrollView.alwaysBounceVertical = NO;
+  webView.scrollView.alwaysBounceHorizontal = NO;
+  return webView;
+}
+
+/** @fn createSpinner
+    @brief Creates a spinner to be used by this view.
+    @return The newly created spinner.
+ */
+- (UIActivityIndicatorView *)createSpinner {
+  UIActivityIndicatorViewStyle spinnerStyle = UIActivityIndicatorViewStyleGray;
+  UIActivityIndicatorView *spinner =
+      [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:spinnerStyle];
+  return spinner;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END