IOS control -- viewWithTag of UIView :( int) findTag method description, viewwithtagfindtag

IOS control -- viewWithTag of UIView :( int) findTag method description, viewwithtagfindtag

UIView has a viewWithTag :( int) findTag method. The call method is [MyView viewWithTag: integer]. This method returns the tag = findTag control. The ios control allows multiple controls to have the same tag. The implementation steps are as follows:

1. If the tag value of MyView is equal to the tag value to be searched, MyView itself is returned;

2. If the tag value of MyView is not equal to the tag value to be searched, the Child control of MyView is searched, that is, the array of MyView. subviews is traversed;

3. When traversing the MyView. subviews array, return the child control with the first tag value equal to the searched tag value;

4. If all child controls are traversed and no matched child controls are found, nil is returned.