這篇文章主要處理加載多層網(wǎng)頁(yè)返回的問題,其實(shí)功能很簡(jiǎn)單,自己當(dāng)時(shí)做的時(shí)候沒帶腦子,找了好久資料沒有想要的(其實(shí)是自己不長(zhǎng)心),記錄一下.
1.在導(dǎo)航上創(chuàng)建一個(gè)關(guān)閉按鈕的btn,默認(rèn)alpha =0

 UIButton *btn =[UIButton buttonWithType:UIButtonTypeCustom];
    [self.nav addSubview:btn];
    [btn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.offset(WIDTH_CONSTARIN(60));
        make.top.offset(STATUS_BAR_HEIGHT);
        make.size.mas_equalTo(CGSizeMake(60, 44));
    }];
    btn.alpha =0;
    
    [btn setTitle:@"關(guān)閉" forState:UIControlStateNormal];
    btn.titleLabel.font =FONT(16.f);
    [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [btn addTarget:self action:sel_registerName("closeClick") forControlEvents:UIControlEventTouchUpInside];
    _closeBtn =btn;

2.處理關(guān)閉按鈕是否顯示(以wkWeb代理為例)

//index不用解釋了
//pageBack參數(shù)主要是為了放置index在返回時(shí)調(diào)用didFinishNavigation再次+1的問題,可以理解為是push和pop,
@property (nonatomic, assign) NSInteger index;//記錄加載的頁(yè)數(shù)
@property (nonatomic, assign) BOOL pageBack;//判斷是否點(diǎn)擊了返回

// 頁(yè)面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    if (!_pageBack) {//是新頁(yè)面 index 就+1
        ++_index;
    }
    _pageBack = NO;
    if (_index >=2 ) {//頁(yè)數(shù)大于等于2 關(guān)閉按鈕就顯示
        _closeBtn.alpha =1;
    }else{
        _closeBtn.alpha =0;
    }

}

3.處理返回和關(guān)閉邏輯

//返回操作
- (void)leftViewClick {
    _pageBack = YES;//是pop,返回結(jié)束后,index不用+1
    if (_index >=2) {
        _index--;
        [self.WKWebView goBack];
    }else{//就一頁(yè)了 可以直接退出去
        [self.navigationController popViewControllerAnimated:YES];
    }
    
}

//關(guān)閉操作
- (void)closeClick {
    [self.loading removeFromSuperview];
    [self.navigationController popViewControllerAnimated:YES];

}