IOS navigationItem 设置返回button，title图片和rightBarButtonItem

1.自己定义返回button

    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStyleBordered target:nil action:nil];

    [self.moreItem setBackgroundImage:[UIImage new] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

    [self.navigationItem setBackBarButtonItem:backItem];

    若想使返回button不可用

          self.navigationItem.leftBarButtonItem = nil;

2.设置标题图片

 self.navigationItem.titleView = [[UIImageViewalloc] initWithImage: [[UIImageimageNamed:@"barLogo.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];

3.设置rightBarButtonItem

self.navigationItem.rightBarButtonItem=[[UIBarButtonItemalloc] initWithImage:[UIImageimageNamed:@"MoreImage.png"]style:UIBarButtonItemStylePlaintarget:selfaction:@selector(rightItemPress)];

若想使rightBarButtonItem不可用

          self.navigationItem.rightBarButtonItem = nil;