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examples/ASViewController/Sample/SampleSizingNode.m

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+//
+//  SampleSizingNode.m
+//  Sample
+//
+//  Created by Michael Schneider on 11/10/16.
+//  Copyright © 2016 AsyncDisplayKit. All rights reserved.
+//
+
+#import "SampleSizingNode.h"
+
+@interface SampleSizingNode ()
+@property (nonatomic, strong) ASDisplayNode *subnode;
+@property (nonatomic, assign) NSInteger state;
+
+@property (nonatomic, strong) ASTextNode *textNode;
+@end
+
+@implementation SampleSizingNode
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self) {
+        
+        self.automaticallyManagesSubnodes = YES;
+        
+        //_subnode = [ASDisplayNode new];
+        //_subnode.backgroundColor = [UIColor redColor];
+        
+        _textNode = [ASTextNode new];
+        _textNode.backgroundColor = [UIColor blueColor];
+        _textNode.autoresizingMask = UIViewAutoresizingNone;
+        
+        _state = 0;
+    }
+    return self;
+}
+
+- (void)didLoad
+{
+    [super didLoad];
+    
+    [self stateChanged];
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        self.state = 1;
+    });
+}
+
+#pragma mark - State Management
+
+- (void)setState:(NSInteger)state
+{
+    _state = state;
+    [self stateChanged];
+}
+
+- (void)stateChanged
+{
+    NSString *text = self.state == 0 ? @"Bla Bla" : @"Bla Blaa sd fkj as;l dkf";
+    self.textNode.attributedText = [[NSAttributedString alloc] initWithString:text];
+    
+    // Invalidate the layout for now and bubble it up until the root node to let the size provider know that
+    // that a size change happened
+    [self setNeedsLayout];
+    
+    // If someone calls `setNeedsLayout` we have to inform the sizing delegate of the root node to be able
+    // to let them now that a size change happened
+    if ([self.delegate respondsToSelector:@selector(displayNodeDidInvalidateSize:)]) {
+        [self.delegate performSelector:@selector(displayNodeDidInvalidateSize:) withObject:self];
+    }
+}
+
+
+#pragma mark - ASDisplayNode
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+    // Layout description based on state
+    //self.subnode.style.preferredSize = constrainedSize.max;
+    UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 10);
+    return [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:_textNode];
+}
+
+
+@end