ios - view offset by Custom navigationBar setBackgroundImage -

i set custom navigationbar kvo in ios8,and custom navigationbar setbackgroundimage.

i found viewcontoller.view.frame.origin.y 64 , viewcontroller navigation's rootviewcontroller.

why viewcontoller.view.frame.origin.y 64 in ios 8?

the following demo code:

@implementation viewcontroller  - (void)viewdidload {     [super viewdidload];      uinavigationbar *temp = [[uinavigationbar alloc]init];     [temp setbackgroundimage:[uiimage imagenamed:@"navbar_bg"] forbarmetrics:uibarmetricsdefault];     [self.navigationcontroller setvalue:temp forkey:@"navigationbar"]; }  - (void)viewdidappear:(bool)animated {      nslog(@"view : %@",self.view); // print :<uiview: 0x7ff8fa72cfa0; frame = (0 64; 375 603); autoresize = rm+bm; layer = <calayer: 0x7ff8fa72b2b0>> } 

if cancel [temp setbackgroundimage:[uiimage imagenamed:@"navbar_bg"] forbarmetrics:uibarmetricsdefault]; , view.origin.y 0 correctly.

what should correctly set custom navigationbar setbackgroundimage , keep self.view.orgin (0,0)?

you can set title of navigationcontroller.navigationitem instead of setting uinavigationbar , providing kvo.

- (void)viewdidload {      [super viewdidload];      uiimageview *img = [[uiimageview alloc] initwithimage:[uiimage imagenamed:@"navbar_bg"]];     //here can create own custom view , provide title of self.navigationcontroller.navigationitem     [self.navigationcontroller.navigationitem settitleview:img]; }  - (void)viewdidappear:(bool)animated {      nslog(@"view : %@",self.view); // print :<uiview: 0x79ea0a30; frame = (0 0; 375 603); autoresize = w+h; layer = <calayer: 0x79ea0ac0>> }