components/Dialogs/examples/supplemental/DialogDismissalOverPresentedControllerViewController.m

/*
 Copyright 2018-present the Material Components for iOS authors. All Rights Reserved.

 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.
 */

/* IMPORTANT:
 This file contains supplemental code used to populate the examples with dummy data and/or
 instructions. It is not necessary to import this file to use Material Components for iOS.
 */

#import "DialogDismissalOverPresentedControllerViewController.h"
#import "MaterialButtons.h"
#import "MaterialDialogs.h"

#pragma mark - Helper View Controller

@interface PresentedViewControllerWithDialog : UIViewController

@property(nonatomic, strong) MDCFlatButton *dialogButton;

@property(nonatomic, strong) MDCFlatButton *dismissButton;

@property(nonatomic, strong) UILabel *topLeftLabel;

@property(nonatomic, strong) UILabel *topRightLabel;

@property(nonatomic, strong) UILabel *bottomLeftLabel;

@property(nonatomic, strong) UILabel *bottomRightLabel;

@end

@implementation PresentedViewControllerWithDialog

- (void)viewDidLoad {
  [super viewDidLoad];

  self.navigationItem.title = @"Presented View Controller";

  // Make a layout that displays content in the corners.
  _topLeftLabel = [[UILabel alloc] init];
  _topLeftLabel.text = @"Top Left";
  _topLeftLabel.textAlignment = NSTextAlignmentLeft;
  _topLeftLabel.backgroundColor = [UIColor lightGrayColor];
  _topLeftLabel.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:_topLeftLabel];

  _topRightLabel = [[UILabel alloc] init];
  _topRightLabel.text = @"Top Right";
  _topRightLabel.textAlignment = NSTextAlignmentRight;
  _topRightLabel.backgroundColor = [UIColor whiteColor];
  _topRightLabel.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:_topRightLabel];

  _bottomLeftLabel = [[UILabel alloc] init];
  _bottomLeftLabel.text = @"Bottom Left";
  _bottomLeftLabel.textAlignment = NSTextAlignmentLeft;
  _bottomLeftLabel.backgroundColor = [UIColor whiteColor];
  _bottomLeftLabel.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:_bottomLeftLabel];

  _bottomRightLabel = [[UILabel alloc] init];
  _bottomRightLabel.text = @"Bottom Right";
  _bottomRightLabel.textAlignment = NSTextAlignmentRight;
  _bottomRightLabel.backgroundColor = [UIColor lightGrayColor];
  _bottomRightLabel.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:_bottomRightLabel];

  NSDictionary *views = NSDictionaryOfVariableBindings(_topLeftLabel, _topRightLabel,
                                                       _bottomLeftLabel, _bottomRightLabel);

  NSArray *constraints =
      [NSLayoutConstraint
          constraintsWithVisualFormat:@"H:|[_topLeftLabel][_topRightLabel(_topLeftLabel)]|"
                              options:0
                              metrics:nil
                                views:views];
  [NSLayoutConstraint activateConstraints:constraints];
  constraints =
      [NSLayoutConstraint
          constraintsWithVisualFormat:@"H:|[_bottomLeftLabel][_bottomRightLabel(_bottomLeftLabel)]|"
                              options:0
                              metrics:nil
                                views:views];
  [NSLayoutConstraint activateConstraints:constraints];
  constraints =
      [NSLayoutConstraint
          constraintsWithVisualFormat:@"V:|[_topLeftLabel][_bottomLeftLabel(_topLeftLabel)]|"
                              options:0
                              metrics:nil
                                views:views];
  [NSLayoutConstraint activateConstraints:constraints];
  constraints =
      [NSLayoutConstraint
          constraintsWithVisualFormat:@"V:|[_topRightLabel][_bottomRightLabel(_topRightLabel)]|"
                              options:0
                              metrics:nil
                                views:views];
  [NSLayoutConstraint activateConstraints:constraints];

  // Add a button to show the dialog from this presented view controller.
  _dialogButton = [[MDCFlatButton alloc] init];
  [_dialogButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
  [_dialogButton setBackgroundColor:[UIColor darkGrayColor] forState:UIControlStateNormal];
  [_dialogButton setTitle:@"Show Dialog" forState:UIControlStateNormal];
  _dialogButton.translatesAutoresizingMaskIntoConstraints = NO;
  [_dialogButton addTarget:self
                     action:@selector(showDialog:)
           forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:_dialogButton];

  [[NSLayoutConstraint constraintWithItem:_dialogButton
                                attribute:NSLayoutAttributeCenterX
                                relatedBy:NSLayoutRelationEqual
                                   toItem:self.view
                                attribute:NSLayoutAttributeCenterX
                               multiplier:1
                                 constant:0] setActive:YES];
  [[NSLayoutConstraint constraintWithItem:_dialogButton
                                attribute:NSLayoutAttributeCenterY
                                relatedBy:NSLayoutRelationEqual
                                   toItem:self.view
                                attribute:NSLayoutAttributeCenterY
                               multiplier:1
                                 constant:0] setActive:YES];
}

- (void)showDialog:(UIButton *)sender {
  MDCAlertController *dialog =
      [MDCAlertController  alertControllerWithTitle:@"This is a normal MDCAlertController"
                                            message:@"When this dialog is dismissed, the content"
                                                    " of the view controller underneath should"
                                                    " remain unchanged and all four sections should"
                                                    " continue to be fully visible."];
  [dialog addAction:[MDCAlertAction actionWithTitle:@"Dismiss Me" handler:nil]];
  [self presentViewController:dialog animated:YES completion:nil];
}

@end

#pragma mark - Supplemental View Controller

@interface DialogDismissalOverPresentedControllerViewController ()

@property(nonatomic, strong) MDCFlatButton *presentButton;

@end

@implementation DialogDismissalOverPresentedControllerViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  // Create a way to present a view controller.
  self.view.backgroundColor = [UIColor whiteColor];

  _presentButton = [[MDCFlatButton alloc] init];
  [_presentButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
  [_presentButton setBackgroundColor:[UIColor darkGrayColor] forState:UIControlStateNormal];
  [_presentButton setTitle:@"Present View Controller" forState:UIControlStateNormal];
  _presentButton.translatesAutoresizingMaskIntoConstraints = NO;
  [_presentButton addTarget:self
                     action:@selector(presentController:)
           forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:_presentButton];

  [[NSLayoutConstraint constraintWithItem:_presentButton
                                attribute:NSLayoutAttributeCenterX
                                relatedBy:NSLayoutRelationEqual
                                   toItem:self.view
                                attribute:NSLayoutAttributeCenterX
                               multiplier:1
                                 constant:0] setActive:YES];
  [[NSLayoutConstraint constraintWithItem:_presentButton
                                attribute:NSLayoutAttributeCenterY
                                relatedBy:NSLayoutRelationEqual
                                   toItem:self.view
                                attribute:NSLayoutAttributeCenterY
                               multiplier:1
                                 constant:0] setActive:YES];
}

- (void)presentController:(UIButton *)sender {
  PresentedViewControllerWithDialog *presentedViewController =
      [[PresentedViewControllerWithDialog alloc] init];
  UIBarButtonItem *closeItem =
      [[UIBarButtonItem alloc] initWithTitle:@"Dismiss"
                                       style:UIBarButtonItemStylePlain
                                      target:self
                                      action:@selector(dismissPresentedViewController)];
  presentedViewController.navigationItem.leftBarButtonItem = closeItem;
  UINavigationController *navController =
      [[UINavigationController alloc] initWithRootViewController:presentedViewController];
  navController.modalPresentationStyle = UIModalPresentationFormSheet;
  [self.navigationController presentViewController:navController
                                          animated:YES
                                        completion:nil];
}

- (void)dismissPresentedViewController {
  [self dismissViewControllerAnimated:YES completion:nil];
}

@end

@implementation DialogDismissalOverPresentedControllerViewController (CatalogByConvention)

+ (NSArray *)catalogBreadcrumbs {
  return @[ @"Dialogs", @"Dialog Over Presented View Controller on iPad" ];
}

+ (BOOL)catalogIsPrimaryDemo {
  return NO;
}

+ (BOOL)catalogIsPresentable {
  return NO;
}

@end