Initial commit

ReactKit/Modules/RCTAlertManager.m

@@ -0,0 +1,107 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#import "RCTAlertManager.h"
+
+#import "RCTLog.h"
+
+@interface RCTAlertManager() <UIAlertViewDelegate>
+
+@end
+
+@implementation RCTAlertManager
+{
+  NSMutableArray *_alerts;
+  NSMutableArray *_alertCallbacks;
+  NSMutableArray *_alertButtonKeys;
+}
+
+- (instancetype)init
+{
+  if ((self = [super init])) {
+    _alerts = [[NSMutableArray alloc] init];
+    _alertCallbacks = [[NSMutableArray alloc] init];
+    _alertButtonKeys = [[NSMutableArray alloc] init];
+  }
+  return self;
+}
+
+/**
+ * @param {NSDictionary} args Dictionary of the form
+ *
+ *   @{
+ *     @"message": @"<Alert message>",
+ *     @"buttons": @[
+ *       @{@"<key1>": @"<title1>"},
+ *       @{@"<key2>": @"<cancelButtonTitle>"},
+ *     ]
+ *   }
+ * The key from the `buttons` dictionary is passed back in the callback on click.
+ * Buttons are displayed in the order they are specified. If "cancel" is used as
+ * the button key, it will be differently highlighted, according to iOS UI conventions.
+ */
+- (void)alertWithArgs:(NSDictionary *)args callback:(RCTResponseSenderBlock)callback
+{
+  RCT_EXPORT();
+
+  NSString *title = args[@"title"];
+  NSString *message = args[@"message"];
+  NSArray *buttons = args[@"buttons"];
+
+  if (!title && !message) {
+    RCTLogMustFix(@"Must specify either an alert title, or message, or both");
+    return;
+  } else if (buttons.count == 0) {
+    RCTLogMustFix(@"Must have at least one button.");
+    return;
+  }
+
+  dispatch_async(dispatch_get_main_queue(), ^{
+    
+    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
+                                                        message:message
+                                                       delegate:self
+                                              cancelButtonTitle:nil
+                                              otherButtonTitles:nil];
+    
+    NSMutableArray *buttonKeys = [[NSMutableArray alloc] initWithCapacity:buttons.count];
+    
+    NSInteger index = 0;
+    for (NSDictionary *button in buttons) {
+      if (button.count != 1) {
+        RCTLogMustFix(@"Button definitions should have exactly one key.");
+      }
+      NSString *buttonKey = [button.allKeys firstObject];
+      NSString *buttonTitle = [button[buttonKey] description];
+      [alertView addButtonWithTitle:buttonTitle];
+      if ([buttonKey isEqualToString: @"cancel"]) {
+        alertView.cancelButtonIndex = index;
+      }
+      [buttonKeys addObject:buttonKey];
+      index ++;
+    }
+    
+    [_alerts addObject:alertView];
+    [_alertCallbacks addObject:callback ?: ^(id unused) {}];
+    [_alertButtonKeys addObject:buttonKeys];
+
+    [alertView show];
+  });
+}
+
+#pragma mark - UIAlertViewDelegate
+
+- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
+{
+  NSUInteger index = [_alerts indexOfObject:alertView];
+  RCTAssert(index != NSNotFound, @"Dismissed alert was not recognised");
+  
+  RCTResponseSenderBlock callback = _alertCallbacks[index];
+  NSArray *buttonKeys = _alertButtonKeys[index];
+  callback(@[buttonKeys[buttonIndex]]);
+  
+  [_alerts removeObjectAtIndex:index];
+  [_alertCallbacks removeObjectAtIndex:index];
+  [_alertButtonKeys removeObjectAtIndex:index];
+}
+
+@end