feat(ios): support for html in AttributedStrings

apidoc/Titanium/UI/AttributedString.yml

@@ -22,6 +22,15 @@ properties:
     description: |
         The `text` property must be set in the constructor and cannot be changed.
     type: String
+
+  - name: html
+    summary: |
+        HTML string which will be transformed in attributed string. You can apply other attributes too.
+    description: |
+        The `html` property must be set in the constructor and cannot be changed. For Android you can use html attribute in Label [html](Titanium.UI.Label.html)
+    platforms: [iphone, ipad, macos]
+    since: 12.0.0
+    type: String
 
   - name: attributes
     summary: |

apidoc/Titanium/UI/Label.yml

@@ -136,6 +136,8 @@ properties:
 
   - name: html
     summary: Simple HTML formatting.
+    description: |
+        For iOS parity you can use Attributed String [html](Titanium.UI.AttributedString.html)
     platforms: [android]
     type: String
 

iphone/Classes/TiUIAttributedStringProxy.m

@@ -20,11 +20,20 @@ - (void)_destroy
 
 - (void)_initWithProperties:(NSDictionary *)properties
 {
-  NSString *text = [properties valueForKey:@"text"];
-  if (!text) {
-    DebugLog(@"[WARN] Ti.UI.AttributedString.text not set");
+  NSString *html = [properties valueForKey:@"html"];
+  if (html) {
+    _attributedString = [[NSAttributedString alloc] initWithData:[html dataUsingEncoding:NSUTF8StringEncoding]
+                                                         options:@{ NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType,
+                                                           NSCharacterEncodingDocumentAttribute : @(NSUTF8StringEncoding) }
+                                              documentAttributes:nil
+                                                           error:nil];
+  } else {
+    NSString *text = [properties valueForKey:@"text"];
+    if (!text) {
+      DebugLog(@"[WARN] Ti.UI.AttributedString.text not set");
+    }
+    _attributedString = [[NSMutableAttributedString alloc] initWithString:text];
   }
-  _attributedString = [[NSMutableAttributedString alloc] initWithString:text];
   attributes = [[NSMutableArray alloc] init];
   [super _initWithProperties:properties];
 }