Add a possibility to set pressure value for iOS

src/main/java/io/appium/java_client/ios/IOSTouchAction.java

@@ -20,6 +20,7 @@
 
 import io.appium.java_client.PerformsTouchActions;
 import io.appium.java_client.TouchAction;
+import io.appium.java_client.ios.touch.IOSPressOptions;
 import io.appium.java_client.touch.offset.ElementOption;
 import io.appium.java_client.touch.offset.PointOption;
 import org.openqa.selenium.WebElement;
@@ -68,4 +69,15 @@ public IOSTouchAction doubleTap(PointOption doubleTapOption) {
         parameterBuilder.add(action);
         return this;
     }
+
+    /**
+     * Press action on the screen.
+     *
+     * @param pressOptions see {@link IOSPressOptions}
+     * @return this TouchAction, for chaining.
+     */
+    public IOSTouchAction press(IOSPressOptions pressOptions) {
+        parameterBuilder.add(new ActionParameter("press", pressOptions));
+        return this;
+    }
 }

src/main/java/io/appium/java_client/ios/touch/IOSPressOptions.java

@@ -0,0 +1,59 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * See the NOTICE file distributed with this work for additional
+ * information regarding copyright ownership.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.appium.java_client.ios.touch;
+
+import static java.util.Optional.ofNullable;
+
+import io.appium.java_client.touch.offset.AbstractOptionCombinedWithPosition;
+
+import java.util.Map;
+
+public class IOSPressOptions extends AbstractOptionCombinedWithPosition<IOSPressOptions> {
+    private Double pressure = null;
+
+    /**
+     * It creates an empty instance of {@link IOSPressOptions}.
+     *
+     * @return an empty instance of {@link IOSPressOptions}
+     */
+    public static IOSPressOptions iosPressOptions() {
+        return new IOSPressOptions();
+    }
+
+    /**
+     * Set the pressure value. This allows to simulate force/3D touch on
+     * devices, that support it.
+     *
+     * @param pressure the value to set.
+     *                 See the description of `force` property on Apple's UITouch class
+     *                 (https://developer.apple.com/documentation/uikit/uitouch?language=objc)
+     *                 for more details on possible value ranges.
+     *
+     * @return this instance for chaining.
+     */
+    public IOSPressOptions withPressure(double pressure) {
+        this.pressure = pressure;
+        return this;
+    }
+
+    @Override
+    public Map<String, Object> build() {
+        final Map<String, Object> result = super.build();
+        ofNullable(pressure).ifPresent(x -> result.put("pressure", x));
+        return result;
+    }
+}

src/test/java/io/appium/java_client/ios/IOSTouchTest.java

@@ -1,9 +1,11 @@
 package io.appium.java_client.ios;
 
 import static io.appium.java_client.MobileBy.IosUIAutomation;
+import static io.appium.java_client.ios.touch.IOSPressOptions.iosPressOptions;
 import static io.appium.java_client.touch.TapOptions.tapOptions;
 import static io.appium.java_client.touch.WaitOptions.waitOptions;
 import static io.appium.java_client.touch.offset.ElementOption.element;
+import static java.time.Duration.ofMillis;
 import static java.time.Duration.ofSeconds;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
@@ -36,6 +38,26 @@ public void tapTest() {
         assertEquals(driver.findElementByXPath("//*[@name = \"Answer\"]").getText(), "6");
     }
 
+    @Test
+    public void touchWithPressureTest() {
+        IOSElement intA = driver.findElementById("IntegerA");
+        IOSElement intB = driver.findElementById("IntegerB");
+        intA.clear();
+        intB.clear();
+        intA.sendKeys("2");
+        intB.sendKeys("4");
+
+        MobileElement e = driver.findElementByAccessibilityId("ComputeSumButton");
+        new IOSTouchAction(driver)
+                .press(iosPressOptions()
+                    .withElement(element(e))
+                    .withPressure(1))
+                .waitAction(waitOptions(ofMillis(100)))
+                .release()
+                .perform();
+        assertEquals(driver.findElementByXPath("//*[@name = \"Answer\"]").getText(), "6");
+    }
+
     @Test public void swipeTest() {
         MobileElement slider = driver.findElementByClassName("UIASlider");
         Dimension size = slider.getSize();