Add 'submodules/AsyncDisplayKit/' from commit '02bedc12816e251ad71777f9d2578329b6d2bef6'

git-subtree-dir: submodules/AsyncDisplayKit
git-subtree-mainline: d06f423e0e
git-subtree-split: 02bedc1281

submodules/AsyncDisplayKit/examples_extra/Placeholders/Sample/ViewController.m

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+//
+//  ViewController.m
+//  Texture
+//
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#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 layoutThatFits:ASSizeRangeMake(CGSizeZero, constrainedSize)].size;
+  CGSize imageSize = [_imageNode layoutThatFits:ASSizeRangeMake(CGSizeZero, constrainedSize)].size;
+
+  _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