风格一致的backItem在项目中怎样设置

在相应的navigationController中重写- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated方法

参照代码：

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.childViewControllers.count > 0) { // 如果push进来的不是第一个控制器
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:@"返回" forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"navigationButtonReturn"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"navigationButtonReturnClick"] forState:UIControlStateHighlighted];
button.size = CGSizeMake(70, 30);
// 让按钮内部的所有内容左对齐
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
button.backgroundColor = [UIColor redColor];
//        [button sizeToFit];
// 让按钮的内容往左边偏移10
button.contentEdgeInsets = UIEdgeInsetsMake(0, -10, 0, 0);
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
[button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

// 修改导航栏左边的item
viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];

// 隐藏tabbar
viewController.hidesBottomBarWhenPushed = YES;
}

// 这句super的push要放在后面, 让viewController可以覆盖上面设置的leftBarButtonItem
[super pushViewController:viewController animated:animated];

}