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.h:

//返回和关闭按钮@property (nonatomic, weak) UIButton * backItem;@property (nonatomic, weak) UIButton * closeItem;

- (void)initGoBack{        UIView * backView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];    UIButton * backItem = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 56, 44)];    [backItem setImage:[UIImage imageNamed:@"popImage"] forState:UIControlStateNormal];    [backItem setImageEdgeInsets:UIEdgeInsetsMake(0, -15, 0, 0)];    [backItem setTitle:@"返回" forState:UIControlStateNormal];    backItem.titleLabel.font = [UIFont systemFontOfSize:15];    [backItem setTitleEdgeInsets:UIEdgeInsetsMake(0, -15, 0, 0)];    [backItem setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];    [backItem addTarget:self action:@selector(clickedBackItem:) forControlEvents:UIControlEventTouchUpInside];    self.backItem = backItem;    [backView addSubview:backItem];        UIButton * closeItem = [[UIButton alloc]initWithFrame:CGRectMake(52, 0, 44, 44)];    [closeItem setTitle:@"关闭" forState:UIControlStateNormal];    [closeItem setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];    [closeItem addTarget:self action:@selector(clickedCloseItem:) forControlEvents:UIControlEventTouchUpInside];    closeItem.titleLabel.font = [UIFont systemFontOfSize:15];    closeItem.hidden = YES;    self.closeItem = closeItem;    [backView addSubview:closeItem];    UIBarButtonItem * leftItemBar = [[UIBarButtonItem alloc]initWithCustomView:backView];    self.navigationItem.leftBarButtonItem = leftItemBar;    }#pragma mark - 返回- (void)clickedBackItem:(UIBarButtonItem *)btn{    UIWebView * webView = [self.view viewWithTag:100];    if (webView.canGoBack) {        [webView goBack];        self.closeItem.hidden = NO;    }else{        [self clickedCloseItem:nil];    }}#pragma mark - 关闭- (void)clickedCloseItem:(UIButton *)btn{    [self.navigationController popViewControllerAnimated:YES];}

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