webView 返回按钮和关闭按钮

.h:

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

.m:

- (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];
}