ios - why there are two other view exist when use storyboard -


my xcode version 5.1.1. create new project using single view application template,and add uibutton on run it, in method:

- (void)viewdidappear:(bool)animated {         [super viewdidappear:animated];         nslog(@"%@", [[uiwindow keywindow] _autolayouttrace]); }

the log : 

*<uiwindow:0x750fa10> |   *<uiview:0x7962b20> |   |   *<uiview:0x7962c60> |   |   *<uiview:0x79621c0> |   |   *<uiroundedrectbutton:0x7618430> - ambiguous layout |   |   |   <uigrouptableviewcellbackground:0x7618e70> |   |   |   <uiimageview:0x7619560> |   |   |   <uibuttonlabel:0x761a920>

there 2 view.

if override in here:

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {     // override point customization after application launch.     self.window = [[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]];      viewcontroller *vc = [[viewcontroller alloc] init];     self.window.rootviewcontroller = vc;      self.window.backgroundcolor = [uicolor whitecolor];     [self.window makekeyandvisible];     return yes; }

the log :

<uiwindow:0x8301700> |   <uiview:0x10c03350> |   |   <uiroundedrectbutton:0x10c036f0> |   |   |   <uigrouptableviewcellbackground:0x10c04080> |   |   |   <uiimageview:0x10c048e0> |   |   |   <uibuttonlabel:0x10c05cc0>

there no view here. happend? auto layout mechanism something？


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