react-native/React/Modules/RCTAlertManager.m

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
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#import "RCTAlertManager.h"
#import "RCTAssert.h"
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#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) {
RCTLogError(@"Must specify either an alert title, or message, or both");
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return;
} else if (buttons.count == 0) {
RCTLogError(@"Must have at least one button.");
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return;
}
dispatch_async(dispatch_get_main_queue(), ^{
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UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
message:message
delegate:self
cancelButtonTitle:nil
otherButtonTitles:nil];
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NSMutableArray *buttonKeys = [[NSMutableArray alloc] initWithCapacity:buttons.count];
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NSInteger index = 0;
for (NSDictionary *button in buttons) {
if (button.count != 1) {
RCTLogError(@"Button definitions should have exactly one key.");
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}
NSString *buttonKey = [button.allKeys firstObject];
NSString *buttonTitle = [button[buttonKey] description];
[alertView addButtonWithTitle:buttonTitle];
if ([buttonKey isEqualToString: @"cancel"]) {
alertView.cancelButtonIndex = index;
}
[buttonKeys addObject:buttonKey];
index ++;
}
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[_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");
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RCTResponseSenderBlock callback = _alertCallbacks[index];
NSArray *buttonKeys = _alertButtonKeys[index];
callback(@[buttonKeys[buttonIndex]]);
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[_alerts removeObjectAtIndex:index];
[_alertCallbacks removeObjectAtIndex:index];
[_alertButtonKeys removeObjectAtIndex:index];
}
@end