The original issue described here: NativeScript#4804 is fixed in 3.2 but there is another bug which doesn't render borderRadius on Image element. (NativeScript#4963)

Hristo Hristov · web-flow · commit 1b9610b4dd07 · 2017-10-20T08:33:08.000+03:00
diff --git a/tns-core-modules/ui/core/view/view.ios.ts b/tns-core-modules/ui/core/view/view.ios.ts
@@ -227,19 +227,21 @@ export class View extends ViewCommon {
     }
 
     private _onSizeChanged(): void {
-        let nativeView = this.nativeViewProtected;
+        const nativeView = this.nativeViewProtected;
         if (!nativeView) {
             return;
         }
 
-        let background = this.style.backgroundInternal;
-        const backgroundDependsOnSize = background.image || !background.hasUniformBorder();
+        const background = this.style.backgroundInternal;
+        const backgroundDependsOnSize = background.image 
+            || !background.hasUniformBorder()
+            || background.hasBorderRadius();
 
         if (this._nativeBackgroundState === "invalid" || (this._nativeBackgroundState === "drawn" && backgroundDependsOnSize)) {
             this._redrawNativeBackground(background);
         }
 
-        let clipPath = this.style.clipPath;
+        const clipPath = this.style.clipPath;
         if (clipPath !== "" && this[clipPathProperty.setNative]) {
             this[clipPathProperty.setNative](clipPath);
         }

Original file line number	Diff line number	Diff line change
`@@ -227,19 +227,21 @@ export class View extends ViewCommon {`
`227`	`227`	`}`
`228`	`228`
`229`	`229`	`private _onSizeChanged(): void {`
`230`		`- let nativeView = this.nativeViewProtected;`
	`230`	`+ const nativeView = this.nativeViewProtected;`
`231`	`231`	`if (!nativeView) {`
`232`	`232`	`return;`
`233`	`233`	`}`
`234`	`234`
`235`		`- let background = this.style.backgroundInternal;`
`236`		`- const backgroundDependsOnSize = background.image \|\| !background.hasUniformBorder();`
	`235`	`+ const background = this.style.backgroundInternal;`
	`236`	`+ const backgroundDependsOnSize = background.image`
	`237`	`+ \|\| !background.hasUniformBorder()`
	`238`	`+ \|\| background.hasBorderRadius();`
`237`	`239`
`238`	`240`	`if (this._nativeBackgroundState === "invalid" \|\| (this._nativeBackgroundState === "drawn" && backgroundDependsOnSize)) {`
`239`	`241`	`this._redrawNativeBackground(background);`
`240`	`242`	`}`
`241`	`243`
`242`		`- let clipPath = this.style.clipPath;`
	`244`	`+ const clipPath = this.style.clipPath;`
`243`	`245`	`if (clipPath !== "" && this[clipPathProperty.setNative]) {`
`244`	`246`	`this[clipPathProperty.setNative](clipPath);`
`245`	`247`	`}`