iOS removes the black border from Navigationcontroller and Tabbarcontroller

iOS removes borders from Navigationcontroller and Tabbarcontroller black by Wusheying

-(void) Viewwillappear: (BOOL) animated {    [Self.navigationController.navigationBar setbackgroundimage:[tdutils Createimagewithcolor:[uicolor Clearcolor]] forbarmetrics:uibarmetricsdefault];    [Self.navigationController.navigationBar setbackindicatortransitionmaskimage:[tdutils createimagewithcolor:[ Uicolor Clearcolor]];    [Self.navigationController.navigationBar setshadowimage:[tdutils Createimagewithcolor:[uicolor Clearcolor]];        [Self.tabBarController.tabBar setbackgroundimage:[tdutils Createimagewithcolor:[uicolor Clearcolor]];    [Self.tabBarController.tabBar setshadowimage:[tdutils Createimagewithcolor:[uicolor Clearcolor]];}