没有背面文字的UIBarButtonItem backButton设置图像会导致标题对齐问题

Question

我想在我的navigationController为backButton使用图像。 我只想使用图像，根本不显示任何“后退”文本，所以我这样做了：

UIImage *backButtonImage = [[UIImage imageNamed:@"ZSSBackButton.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 25, 0, 0)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, backButtonImage.size.height*2) forBarMetrics:UIBarMetricsDefault];

这很好用，但似乎对较长的navigationItem标题似乎不在中心有副作用，即使实际上只是在空白处保留了backbutton文本应为：

有没有办法我可以将标题再左一点？

Answer 1

您可以使用titleView属性管理UINavigationbar标题的位置。

UIView *backView =[[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 40)];// Here you can set View width and height as per your requirement for displaying titleLbl position in navigationbar 
[backView setBackgroundColor:[UIColor clearColor]];
UILabel *titleLbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 40)];
[backView addSubview:titleLbl];
titleLbl.text  = @"YOUR TITLE";
titleLbl.textAlignment = NSTextAlignmentCenter;
self.navigationItem.titleView = backView;

编辑：您可以创建自定义按钮，并将其分配给leftbutton：

UIButton *btnBack = [UIButton buttonWithType:UIButtonTypeCustom];
btnBack.frame = CGRectMake(0,0,51,31);
[btnBack setBackgroundImage:[UIImage imageNamed:@"ZSSBackButton"] forState:UIControlStateNormal];
[btnBack addTarget:self action:@selector(btnBackProfile_TouchUpInside:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *leftBtn = [[UIBarButtonItem alloc] initWithCustomView:btnBack];
[self.navigationItem setLeftBarButtonItem:leftBtn];

希望对您有帮助。