pocoui相关 小程序UI脚本运行时有时候会定位不到元素报超时，有时间又没问题，已添加了等待时间方式了，排除页面加载时间问题。可看具体描述，多谢。

运行环境:
macos10.14.6,python 3.9 , airtest 1.2.0 ,pocoui 1.0.82,手机华为mote10，手机系统android10，Android Debug Bridge version 1.0.41 Version 29.0.6-6198805，微信小程序:"超级猩猩"
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问题描述:
在运行脚本时微信切入小程序页面后，定位不到小程序页面元素，报了超时错误。但是该场景问题偶尔会成功，有时间就可以定位到，不会报错。经过确认不是页面加载太快或太慢的原因，因为已经加了等待。同时手机对pocoservice已经开启启动权限。

代码截图:

报错信息:
报错:
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 wait-for-device
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell getprop ro.build.version.sdk
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys activity top
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys package com.netease.open.pocoservice
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys package com.netease.open.pocoservice.test
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 forward --no-rebind tcp:17413 tcp:10080
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 forward --no-rebind tcp:12023 tcp:10081
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell ps -A |echo $(grep -E com.github.uiautomator)
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell am force-stop com.netease.open.pocoservice
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell am start -n com.netease.open.pocoservice/.TestActivity
[11:04:20][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell am instrument -w -e debug false -e class com.netease.open.pocoservice.InstrumentedTestAsLauncher com.netease.open.pocoservice.test/android.support.test.runner.AndroidJUnitRunner
[11:04:22][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell monkey -p com.tencent.mm -c android.intent.category.LAUNCHER 1
[11:04:29][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell ls -l /data/local/tmp/rotationwatcher.jar
[11:04:29][DEBUG] install_rotationwatcher skipped
[11:04:29][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell app_process -Djava.class.path=/data/local/tmp/rotationwatcher.jar /data/local/tmp com.example.rotationwatcher.Main
[11:04:29][DEBUG] [rotation_server]b'0'
[11:04:31][INFO] update orientation None->0
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys display
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys SurfaceFlinger
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell getevent -p
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell ls -l /data/local/tmp/maxpresent.jar
[11:04:31][DEBUG] install_maxtouch skipped
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys display
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell dumpsys SurfaceFlinger
[11:04:31][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell getevent -p
[11:04:32][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 forward --no-rebind tcp:12512 localabstract:maxpresent_12512
[11:04:32][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell app_process -Djava.class.path=/data/local/tmp/maxpresent.jar /data/local/tmp com.netease.maxpresent.MaxPresent socket maxpresent_12512
[11:04:32][DEBUG] [airtouch_server]b'Metrics Message : 2560.0=====1440.0'
[11:04:32][DEBUG] [airtouch_server]b'Start local socket (maxpresent_12512) server...'
[11:06:50][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 shell am force-stop com.tencent.mm

Error
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/case.py", line 59, in testPartExecutor
yield
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/case.py", line 593, in run
self._callTestMethod(testMethod)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/case.py", line 550, in _callTestMethod
method()
File "/Users/supermonkey/AirtestProject/demo.py", line 125, in test_case
self.assertEqual(HomePage().select_good_lessons_get_text(poco=self.poco),"精选好课")
File "/Users/supermonkey/AirtestProject/demo.py", line 88, in select_good_lessons_get_text
init_element(self.select_good_lessons,poco).wait_for_appearance()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/poco/proxy.py", line 681, in wait_for_appearance
raise PocoTargetTimeout('appearance', self)
poco.exceptions.PocoTargetTimeout: Waiting timeout for appearance of "UIObjectProxy of "text=精选好课""

Assertion failed
只执行一次

Ran 1 test in 150.926s

FAILED (errors=1)
[11:06:51][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 forward --remove tcp:17413
[11:06:51][DEBUG] /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/airtest/core/android/static/adb/mac/adb -P 5037 -s UYT5T18524015578 forward --remove tcp:12512
[11:06:51][DEBUG] [rotation_server]b''
[11:06:51][DEBUG] [airtouch_server]b''

Process finished with exit code 1

Assertion failed

Assertion failed