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/*
* 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 "CustomTokenDataEntryViewController.h"
/** @var navigationBarDefaultHeight
@brief The default height to use for new navigation bars' frames.
*/
static const NSUInteger navigationBarDefaultHeight = 55;
/** @var navigationBarSystemHeight
@brief Set after a navigation bar has been created to obtain the system-specified height of the
navigation bar.
*/
static NSUInteger navigationBarSystemHeight = navigationBarDefaultHeight;
/** @var kTitle
@brief The title of the view controller as it appears at the top of the screen in the navigation
bar.
*/
static NSString *const kTitle = @"Enter Token";
/** @var kCancel
@brief The text for the "Cancel" button.
*/
static NSString *const kCancel = @"Cancel";
/** @var kDone
@brief The text for the "Done" button.
*/
static NSString *const kDone = @"Done";
@implementation CustomTokenDataEntryViewController {
/** @var _completion
@brief The block we will call when the user presses the "cancel" or "done" buttons.
@remarks Passed into the initializer.
*/
CustomTokenDataEntryViewControllerCompletion _completion;
/** @var _tokenTextView
@brief The text view allowing the user to enter their custom token text.
@remarks Constructed and set in the method: @c loadTextView.
*/
__weak UITextView *_Nullable _tokenTextView;
}
- (nullable instancetype)initWithCompletion:
(CustomTokenDataEntryViewControllerCompletion)completion {
self = [super initWithNibName:nil bundle:nil];
if (self) {
_completion = completion;
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self loadHeader];
[self loadTextView];
}
#pragma mark - View
/** @fn loadHeader
@brief Loads the header bar along the top of the view with "Cancel" and "Done" buttons, as well
as a brief title asking the user to enter the custom token text.
@remarks Updates navigationBarSystemHeight, so should be called before any method which depends
on that variable being updated (like the @c loadTextView method, which uses the value to
determine how much room is left on the screen.)
*/
- (void)loadHeader {
CGRect navBarFrame = CGRectMake(0, 0, self.view.bounds.size.width, navigationBarDefaultHeight);
UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:navBarFrame];
navBar.autoresizingMask = UIViewAutoresizingFlexibleWidth
| UIViewAutoresizingFlexibleBottomMargin;
UINavigationItem *navItem = [[UINavigationItem alloc] initWithTitle:kTitle];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:kCancel
style:UIBarButtonItemStylePlain
target:self
action:@selector(cancelPressed:)];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:kDone
style:UIBarButtonItemStylePlain
target:self
action:@selector(donePressed:)];
navItem.leftBarButtonItem = cancelButton;
navItem.rightBarButtonItem = doneButton;
[navBar setItems:@[ navItem ] animated:NO];
[self.view addSubview:navBar];
// Obtain the system-specified height of the navigation bar.
navigationBarSystemHeight = navBar.frame.size.height;
}
/** @fn loadTextView
@brief Loads the text field for the user to enter their custom token text.
@remarks Relies on the navigationBarSystemHeight variable being correct.
*/
- (void)loadTextView {
CGRect tokenTextViewFrame =
CGRectMake(0,
navigationBarSystemHeight,
self.view.bounds.size.width,
self.view.bounds.size.height - navigationBarSystemHeight);
UITextView *tokenTextView = [[UITextView alloc] initWithFrame:tokenTextViewFrame];
tokenTextView.backgroundColor = [UIColor whiteColor];
tokenTextView.textAlignment = NSTextAlignmentLeft;
[self.view addSubview:tokenTextView];
_tokenTextView = tokenTextView;
}
#pragma mark - Actions
- (void)cancelPressed:(id)sender {
[self finishByCancelling:YES withUserEnteredTokenText:nil];
}
- (void)donePressed:(id)sender {
[self finishByCancelling:NO withUserEnteredTokenText:_tokenTextView.text];
}
#pragma mark - Workflow
- (void)finishByCancelling:(BOOL)cancelled
withUserEnteredTokenText:(nullable NSString *)userEnteredTokenText {
[self dismissViewControllerAnimated:YES completion:^{
_completion(cancelled,
cancelled ? nil : userEnteredTokenText);
}];
}
@end
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