iOS 设置navigationBar背景

- (void)viewWillAppear:(BOOL)animated {
[superviewWillAppear:animated];
[self.navigationController.navigationBarsetBackgroundImage:[UIImageimageNamed:@"searchBackground"]forBarMetrics:UIBarMetricsDefault];
}
如果自在当前这个页面设置背景色..需要在试图将要消失的时候修改回来主色调

- (void)viewWillDisappear:(BOOL)animated {

[super viewWillDisappear:animated];

navBarHairlineImageView.hidden = NO;

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:kNavDeepColor] forBarMetrics:UIBarMetricsDefault];

}