## 简单的屏幕swipe Swipe操作有起始和终止点。起始点位置很重要。以下元素可能会阻止swipe动作生效： - 应用接口/菜单，例如 页眉（header）或页脚（footer）。 - 等待被触碰(tap)的元素并没有将touch事件传递给滚动视图 最好从屏幕中间开始swipe动作以获取更稳定的效果。  ```java /** * Performs swipe from the center of screen * * @param dir the direction of swipe * @version java-client: 7.3.0 **/ public void swipeScreen(Direction dir) { System.out.println("swipeScreen(): dir: '" + dir + "'"); // always log your actions // Animation default time: // - Android: 300 ms // - iOS: 200 ms // final value depends on your app and could be greater final int ANIMATION_TIME = 200; // ms final int PRESS_TIME = 200; // ms int edgeBorder = 10; // better avoid edges PointOption pointOptionStart, pointOptionEnd; // init screen variables Dimension dims = driver.manage().window().getSize(); // init start point = center of screen pointOptionStart = PointOption.point(dims.width / 2, dims.height / 2); switch (dir) { case DOWN: // center of footer pointOptionEnd = PointOption.point(dims.width / 2, dims.height - edgeBorder); break; case UP: // center of header pointOptionEnd = PointOption.point(dims.width / 2, edgeBorder); break; case LEFT: // center of left side pointOptionEnd = PointOption.point(edgeBorder, dims.height / 2); break; case RIGHT: // center of right side pointOptionEnd = PointOption.point(dims.width - edgeBorder, dims.height / 2); break; default: throw new IllegalArgumentException("swipeScreen(): dir: '" + dir + "' NOT supported"); } // execute swipe using TouchAction try { new TouchAction(driver) .press(pointOptionStart) // a bit more reliable when we add small wait .waitAction(WaitOptions.waitOptions(Duration.ofMillis(PRESS_TIME))) .moveTo(pointOptionEnd) .release().perform(); } catch (Exception e) { System.err.println("swipeScreen(): TouchAction FAILED\n" + e.getMessage()); return; } // always allow swipe action to complete try { Thread.sleep(ANIMATION_TIME); } catch (InterruptedException e) { // ignore } } public enum Direction { UP, DOWN, LEFT, RIGHT; } ```