XCUIElementTypeQueryProvider:为特定

——为特定类型的子元素提供现成的查询的类所采用的协议
——这些属性表示暴露于可访问系统中的数据，并在查询匹配过程中可用。
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Descendant Element Queries

 //常用的
 @property(readonly, copy) XCUIElementQuery *activityIndicators;
 @property(readonly, copy) XCUIElementQuery *alerts;
 @property(readonly, copy) XCUIElementQuery *buttons;
 @property(readonly, copy) XCUIElementQuery *cells;
 @property(readonly, copy) XCUIElementQuery *collectionViews;
 @property(readonly, copy) XCUIElementQuery *datePickers;
 @property(readonly, copy) XCUIElementQuery *groups;
 @property(readonly, copy) XCUIElementQuery *icons;
 @property(readonly, copy) XCUIElementQuery *images;
 @property(readonly, copy) XCUIElementQuery *keyboards;
 @property(readonly, copy) XCUIElementQuery *pickers;
 @property(readonly, copy) XCUIElementQuery *progressIndicators;
 @property(readonly, copy) XCUIElementQuery *scrollViews;
 @property(readonly, copy) XCUIElementQuery *searchFields;
 @property(readonly, copy) XCUIElementQuery *segmentedControls;
 @property(readonly, copy) XCUIElementQuery *secureTextFields;
 @property(readonly, copy) XCUIElementQuery *sliders;
 @property(readonly, copy) XCUIElementQuery *tabBars;
 @property(readonly, copy) XCUIElementQuery *tableRows;
 @property(readonly, copy) XCUIElementQuery *tableColumns;
 @property(readonly, copy) XCUIElementQuery *textFields
 @property(readonly, copy) XCUIElementQuery *textViews;
 @property(readonly, copy) XCUIElementQuery *webViews;
 @property(readonly, copy) XCUIElementQuery *window;;

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