ViewController.m

//
//  ViewController.m
//  Sample
//
//  Copyright (c) 2014-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.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
//  FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
//  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
//  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#import "ViewController.h"

#import <AsyncDisplayKit/AsyncDisplayKit.h>

#import "PostNode.h"
#import "SlowpokeImageNode.h"
#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>

@interface ViewController ()
{
  PostNode *_postNode;
  SlowpokeImageNode *_imageNode;
  UIButton *_displayButton;
}

@end


@implementation ViewController

#pragma mark -
#pragma mark UIViewController

- (instancetype)init
{
  if (!(self = [super init]))
    return nil;

  _displayButton = [UIButton buttonWithType:UIButtonTypeCustom];
  [_displayButton setTitle:@"Display me!" forState:UIControlStateNormal];
  [_displayButton addTarget:self action:@selector(onDisplayButton:) forControlEvents:UIControlEventTouchUpInside];

  UIColor *tintBlue = [UIColor colorWithRed:0 green:122/255.0 blue:1.0 alpha:1.0];
  [_displayButton setTitleColor:tintBlue forState:UIControlStateNormal];
  [_displayButton setTitleColor:[tintBlue colorWithAlphaComponent:0.5] forState:UIControlStateHighlighted];
  _displayButton.backgroundColor = [UIColor colorWithWhite:0.95 alpha:1.0];

  return self;
}

- (void)viewDidLoad
{
  [super viewDidLoad];

  [self.view addSubview:_displayButton];
}

- (void)viewWillLayoutSubviews
{
  CGFloat padding = 20.0;
  CGRect bounds = self.view.bounds;
  CGFloat constrainedWidth = CGRectGetWidth(bounds);
  CGSize constrainedSize = CGSizeMake(constrainedWidth - 2 * padding, CGFLOAT_MAX);

  CGSize postSize = [_postNode measure:constrainedSize];
  CGSize imageSize = [_imageNode measure:constrainedSize];

  _imageNode.frame = (CGRect){padding, padding, imageSize};
  _postNode.frame = (CGRect){padding, CGRectGetMaxY(_imageNode.frame) + 10.0, postSize};

  CGFloat buttonHeight = 55.0;
  _displayButton.frame = (CGRect){0.0, CGRectGetHeight(bounds) - buttonHeight, CGRectGetWidth(bounds), buttonHeight};
}

// this method is pretty gross and just for demonstration  :]
- (void)createAndDisplayNodes
{
  [_imageNode.view removeFromSuperview];
  [_postNode.view removeFromSuperview];

  // ASImageNode gets placeholders by default
  _imageNode = [[SlowpokeImageNode alloc] init];
  _imageNode.image = [UIImage imageNamed:@"logo"];

  _postNode = [[PostNode alloc] init];

  // change to NO to see text placeholders, change to YES to see the parent placeholder
  // this placeholder will cover all subnodes while they are displaying, just a like a stage curtain!
  _postNode.placeholderEnabled = NO;

  [self.view addSubnode:_imageNode];
  [self.view addSubnode:_postNode];
}


#pragma mark -
#pragma mark Actions

- (void)onDisplayButton:(id)sender
{
  [self createAndDisplayNodes];
}

@end