fix(8151): button textAlignment on IOS (UIButton) (#8181)

sylann · romain20100-rwigo · dtopuzov · vtrifonov · commit 05ef9b0ff24b · 2020-01-21T18:39:42.000+02:00
When setting the format of a "text view", we need to recover existing values for properties that will get default values otherwise.
The "textAlignment" of a UIButton is available through a "titleLabel" object instead of directly on itself (see IOS documentation fo UIButton).

Co-authored-by: Romain Vincent &lt;54814371+romain20100@users.noreply.github.com&gt;
Co-authored-by: Dimitar Topuzov &lt;dtopuzov@gmail.com&gt;
Co-authored-by: Vasil Trifonov &lt;v.trifonov@gmail.com&gt;
diff --git a/nativescript-core/ui/text-base/text-base.ios.ts b/nativescript-core/ui/text-base/text-base.ios.ts
@@ -139,7 +139,12 @@ export class TextBase extends TextBaseCommon {
             const paragraphStyle = NSMutableParagraphStyle.alloc().init();
             paragraphStyle.lineSpacing = this.lineHeight;
             // make sure a possible previously set text alignment setting is not lost when line height is specified
-            paragraphStyle.alignment = (<UITextField | UITextView | UILabel>this.nativeTextViewProtected).textAlignment;
+            if (this.nativeTextViewProtected instanceof UIButton) {
+                paragraphStyle.alignment = (<UIButton>this.nativeTextViewProtected).titleLabel.textAlignment;
+            } else {
+                paragraphStyle.alignment = (<UITextField | UITextView | UILabel>this.nativeTextViewProtected).textAlignment;
+            }
+
             if (this.nativeTextViewProtected instanceof UILabel) {
                 // make sure a possible previously set line break mode is not lost when line height is specified
                 paragraphStyle.lineBreakMode = this.nativeTextViewProtected.lineBreakMode;
@@ -192,7 +197,12 @@ export class TextBase extends TextBaseCommon {
             const paragraphStyle = NSMutableParagraphStyle.alloc().init();
             paragraphStyle.lineSpacing = style.lineHeight;
             // make sure a possible previously set text alignment setting is not lost when line height is specified
-            paragraphStyle.alignment = (<UITextField | UITextView | UILabel>this.nativeTextViewProtected).textAlignment;
+            if (this.nativeTextViewProtected instanceof UIButton) {
+                paragraphStyle.alignment = (<UIButton>this.nativeTextViewProtected).titleLabel.textAlignment;
+            } else {
+                paragraphStyle.alignment = (<UITextField | UITextView | UILabel>this.nativeTextViewProtected).textAlignment;
+            }
+
             if (this.nativeTextViewProtected instanceof UILabel) {
                 // make sure a possible previously set line break mode is not lost when line height is specified
                 paragraphStyle.lineBreakMode = this.nativeTextViewProtected.lineBreakMode;
