How iOS sets the font color of the status bar for all interfaces to white

First step: Add a field to Info.plist: View controller-base status bar set to No

Step two: Add in a parent class where all interfaces inherit:

if (Ios7_or_later) {//Determine if it is IOS7

[[UIApplication sharedapplication] setstatusbarstyle: uistatusbarstylelightcontent animated: NO];

}

Of course the above code as long as written in the program entrance immediately, after all, is global.

How iOS sets the font color of the status bar for all interfaces to white