## Swipe 故障排查手册
### 简单 swipe 动作
采用以下步骤进行故障排查:
1. 添加触摸点坐标的日志
带有日志的滑屏操作示例:
```java
/**
* Performs swipe from the center of screen
*
* @param dir the direction of swipe
* @version java-client: 7.3.0
**/
public void swipeScreenWithLogs(Direction dir) {
System.out.println("swipeScreen(): dir: '" + dir + "'"); // 总在日志中记录执行的操作
// 默认动画时长:
// - 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
Point pointStart, pointEnd;
PointOption pointOptionStart, pointOptionEnd;
// init screen variables
Dimension dims = driver.manage().window().getSize();
// init start point = center of screen
pointStart = new Point(dims.width / 2, dims.height / 2);
switch (dir) {
case DOWN: // center of footer
pointEnd = new Point(dims.width / 2, dims.height - edgeBorder);
break;
case UP: // center of header
pointEnd = new Point(dims.width / 2, edgeBorder);
break;
case LEFT: // center of left side
pointEnd = new Point(edgeBorder, dims.height / 2);
break;
case RIGHT: // center of right side
pointEnd = new Point(dims.width - edgeBorder, dims.height / 2);
break;
default:
throw new IllegalArgumentException("swipeScreen(): dir: '" + dir.toString() + "' NOT supported");
}
// execute swipe using TouchAction
pointOptionStart = PointOption.point(pointStart.x, pointStart.y);
pointOptionEnd = PointOption.point(pointEnd.x, pointEnd.y);
System.out.println("swipeScreen(): pointStart: {" + pointStart.x + "," + pointStart.y + "}");
System.out.println("swipeScreen(): pointEnd: {" + pointEnd.x + "," + pointEnd.y + "}");
System.out.println("swipeScreen(): screenSize: {" + dims.width + "," + dims.height + "}");
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
}
}
```
示例输出:
```
swipeScreen(): dir: 'DOWN'
swipeScreen(): pointStart: {187,333}
swipeScreen(): pointEnd: {187,657}
swipeScreen(): screenSize: {375,667}
swipeScreen(): dir: 'UP'
swipeScreen(): pointStart: {187,333}
swipeScreen(): pointEnd: {187,10}
swipeScreen(): screenSize: {375,667}
```
2. Android设置里开启'显示Taps位置'和'指针位置',在'设置 -> 系统 -> 开发者选项 -> tab输入'显示操作的位置坐标.
3. 手动执行相同的滑屏动作以验证。
### Android: 'UIScrollable' 滑动(swipe)
#### 滑动没有开始:
1. 检查是否有多个滑动视图(scrollViews). 如果有多个,通过instance/resource-id/classname/等方式指定具体的某一个。
2. 检查滑动视图的布局方向,使用'setAsVerticalList'或'setAsHorizontalList'来设置布局方向。
3. 混合使用上述两种方式。
4. 都失败的话,尝试使用简单元素滑动方式。
#### 找不到查找的元素:
1. 查找前添加暂停动作,在此期间手动滑屏让查找的元素出现。暂停后添加代码检查是否可以找到元素。下面的例子使用文本查找方式来演示——
```java
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiSelector().text(\"exact_text\")"));
// or
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiSelector().textContains(\"part_text\")"));
try {
System.out.println("Element found: " + !element.getId().isEmpty());
} catch (Exception e) {
System.out.println("Element found: false");
}
```
### iOS: 'mobile:scroll', 'mobile:swipe' 滑动(swipe)
#### 滑动没有开始:
1. 检查方向,注意'scroll'和'swipe'方法的方向参数不同。
2. 都失败的话,尝试使用简单元素滑动方式。
#### 找不到查找的元素:
1. 尝试使用精准swipe而不是scroll方法
2. 有时当查找的元素只出现一部分的话,tap动作将可能失败。此时,使用简单部分元素滑动(Simple-partial-element)——就像在简单半屏例子种演示的那样——中的策略重试一下。同时执行部分元素滑动(partial element swipe)操作后,再重试一下tap动作。
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