[Example] Resolved ASTextNode bugs (test app to reproduce issues, do regression testing) (#1803)

* [Examples] text node known inconsistencies with UILabel

* addressed @appleguy's comments

examples_extra/TextStressTest/Sample/ViewController.m

@@ -0,0 +1,165 @@
+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * 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>
+
+#define NUMBER_ELEMENTS 2
+
+@interface ViewController ()
+{
+  NSMutableArray <ASTextNode *> *_textNodes;
+  NSMutableArray <UILabel *> *_textLabels;
+  UIScrollView *_scrollView;
+}
+
+@end
+
+
+@implementation ViewController
+
+- (void)viewDidLoad
+{
+  [super viewDidLoad];
+  
+  _textNodes = [NSMutableArray array];
+  _textLabels = [NSMutableArray array];
+  
+  _scrollView = [[UIScrollView alloc] init];
+  [self.view addSubview:_scrollView];
+  
+  for (int i = 0; i < NUMBER_ELEMENTS; i++) {
+    
+    ASTextNode *node = [self createNodeForIndex:i];
+    [_textNodes addObject:node];
+    [_scrollView addSubnode:node];
+
+    UILabel *label = [self createLabelForIndex:i];
+    [_textLabels addObject:label];
+    [_scrollView addSubview:label];
+  }
+}
+
+- (void)viewWillLayoutSubviews
+{
+  [super viewWillLayoutSubviews];
+  
+  CGFloat maxWidth = 0;
+  CGFloat maxHeight = 0;
+  
+  CGRect frame = CGRectMake(50, 50, 0, 0);
+  
+  for (int i = 0; i < NUMBER_ELEMENTS; i++) {
+    frame.size = [self sizeForIndex:i];
+    [[_textNodes objectAtIndex:i] setFrame:frame];
+    
+    frame.origin.x += frame.size.width + 50;
+    
+    [[_textLabels objectAtIndex:i] setFrame:frame];
+    
+    if (frame.size.width > maxWidth) {
+      maxWidth = frame.size.width;
+    }
+    if ((frame.size.height + frame.origin.y) > maxHeight) {
+      maxHeight = frame.size.height + frame.origin.y;
+    }
+    
+    frame.origin.x -= frame.size.width + 50;
+    frame.origin.y += frame.size.height + 20;
+  }
+  
+  _scrollView.frame = self.view.bounds;
+  _scrollView.contentSize = CGSizeMake(maxWidth, maxHeight);
+}
+
+- (ASTextNode *)createNodeForIndex:(NSUInteger)index
+{
+  ASTextNode *node = [[ASTextNode alloc] init];
+  node.attributedText = [self textForIndex:index];
+  node.backgroundColor = [UIColor orangeColor];
+  
+  NSMutableAttributedString *string = [node.attributedText mutableCopy];
+  
+  switch (index) {
+    case 0:                             // top justification (ASDK) vs. center justification (UILabel)
+      node.maximumNumberOfLines = 3;
+      return node;
+      
+    case 1:                             // default truncation attributed string color shouldn't match attributed text color (ASDK) vs. match (UIKit)
+      node.maximumNumberOfLines = 3;
+      [string addAttribute:NSForegroundColorAttributeName
+                     value:[UIColor redColor]
+                     range:NSMakeRange(0, [string length])];
+      node.attributedText = string;
+      return node;
+  
+    default:
+      return nil;
+  }
+}
+
+- (UILabel *)createLabelForIndex:(NSUInteger)index
+{
+  UILabel *label = [[UILabel alloc] init];
+  label.attributedText = [self textForIndex:index];
+  label.backgroundColor = [UIColor greenColor];
+  
+  NSMutableAttributedString *string = [label.attributedText mutableCopy];
+  
+  switch (index) {
+    case 0:
+      label.numberOfLines = 3;
+      return label;
+      
+    case 1:
+      label.numberOfLines = 3;
+      [string addAttribute:NSForegroundColorAttributeName
+                     value:[UIColor redColor]
+                     range:NSMakeRange(0, [string length])];
+      label.attributedText = string;
+      return label;
+    
+    default:
+      return nil;
+  }
+}
+
+- (NSAttributedString *)textForIndex:(NSUInteger)index
+{
+  NSDictionary *attrs = @{ NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue" size:12.0f] };
+
+  switch (index) {
+    case 0:
+      return [[NSAttributedString alloc] initWithString:@"1\n2\n3\n4\n5" attributes:attrs];
+      
+    case 1:
+      return [[NSAttributedString alloc] initWithString:@"1\n2\n3\n4\n5" attributes:attrs];
+      
+    default:
+      return nil;
+  }
+}
+
+- (CGSize)sizeForIndex:(NSUInteger)index
+{
+  switch (index) {
+    case 0:
+      return CGSizeMake(40, 100);
+      
+    case 1:
+      return CGSizeMake(40, 100);
+      
+    default:
+      return CGSizeZero;
+  }
+}
+
+@end