Completely resolve the IOS7 status bar hidden problem (and Setstatusbarhidden:yes does not work)

In general, adding the View controller-based status barappearance in Info.plist and setting the value to no allows you to freely control the hiding and displaying of the status bar in your program.
The problem is that the status bar color and the color of the interface does not match, then change the setstatusbarstyle on it.
But there is a situation, that is, when you open a photo album or camera, use the Uiimagepickercontroller, the status bar will be displayed, even if you hide it, it is transparent to show, but do not occupy the place, tried various methods can not hide out, Prefersstatusbarhidden also no avail.
Finally, the following methods are used to inherit a Uiimagepickercontroller subclass that controls the display and concealment of the status bar in each method of the subclass. Looks like this is a bug in iOS7.
@interface Ifimagepickercontrollerex:uiimagepickercontroller-(void) Viewdiddisappear: (BOOL) animated; -(void) Viewdidappear: (BOOL) animated; -(void) Viewwilldisappear: (BOOL) animated; @end
@implementation Ifimagepickercontrollerex-(void) Viewdidappear: (BOOL) animated {[superviewdidappear:animated]; [[Uiapplicationsharedapplication]setstatusbarstyle:uistatusbarstyledefault];     }-(void) Viewwilldisappear: (BOOL) animated {[superviewwilldisappear:animated]; [[Uiapplicationsharedapplication] Setstatusbarhidden:yes Withanimation:no];     }-(void) Viewdiddisappear: (BOOL) animated {[superviewdiddisappear:animated]; [[Uiapplicationsharedapplication] Setstatusbarhidden:yes Withanimation:no]; }