Question

我有一个问题，我已经打了好几个星期了。请帮忙。我有一个iOS 7应用程序，其中包含导航栏视图，带有嵌入文本字段的视图（addressBarView）和Web视图。我正在实现WebScriptObject（我并不关心iTunes商店的可通行性），因此网页JavaScript可以触发Objective C方法。这很有效，直到我触发一个应该隐藏导航栏和地址栏的方法。

以下是视图......

The View

......这是子视图的结构和弹簧......

addressBarView

urlTextField

webView

加载网页时，会检查META标记。如果他们说<meta http-equiv="hidenavbar" content="true">或<meta http-equiv="hideaddressbar" content="true">，则会触发下面的showHideNavBar或showHideNavBar方法。这些工作很棒。

现在这里没有

我不会厌倦你在WebScriptObject上的细节，但这是相对的代码段。

#pragma mark - webScript Bridge

+ (NSString *)webScriptNameForSelector:(SEL)sel {
    // Naming rules can be found at:http://goo.gl/GAkziE
    if (sel == @selector(showHideAddressBar::)) {return @"showHideAddressBar";} else
    if (sel == @selector(showHideNavBar::)) {return @"showHideNavBar";}
}

因为所有UI更改都必须在主线程上完成，所以我这样做......

- (void)showHideNavBar:(BOOL)hide :(BOOL)animate {
    NSDictionary *navBarOptions = @{@"hide": [NSString stringWithFormat:@"%hhd", hide],
                                    @"animate": [NSString stringWithFormat:@"%hhd", animate]};
    [self performSelectorOnMainThread:@selector(navBarState:) withObject:navBarOptions waitUntilDone:NO];
}

- (void)showHideAddressBar:(BOOL)hide :(BOOL)animate {
    NSDictionary *adrBarOptions = @{@"hide": [NSString stringWithFormat:@"%hhd", hide],
                                   @"animate": [NSString stringWithFormat:@"%hhd", animate]};
    [self performSelectorOnMainThread:@selector(addressBarState:) withObject:adrBarOptions waitUntilDone:NO];
}

然后是非常时髦的东西。

- (void)navBarState:(NSDictionary *)navBarOptions {
    float addressBarY = navBarHidden ? 20.0f : 0.0f;
    BOOL animate = [navBarOptions[@"animate"] boolValue];
    BOOL hide = [navBarOptions[@"hide"] boolValue];
    float webViewY = addressBarY + (addressBarHidden ? 0.0f : 40.0f);
    float webViewHeight = [self view].frame.size.height - webViewY;

    self.navigationController.navigationBar.translucent = NO;
    if (hide && !navBarHidden) {
        navBarHidden = YES;
        [self.navigationController setNavigationBarHidden:YES animated:animate];
    }
    else if (!hide && navBarHidden) {
        navBarHidden = NO;
        [self.navigationController setNavigationBarHidden:NO animated:animate];
    }

    CGRect rectAddrBar = self.addressBarView.frame;
    rectAddrBar.origin.y = addressBarY;
    self.addressBarView.frame = rectAddrBar;

    CGRect rectWebView = self.webView.frame;
    rectWebView.origin.y = webViewY;
    rectWebView.size.height = webViewHeight;
    self.webView.frame = rectWebView;

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.view layoutSubviews];
    });
}

- (void)addressBarState:(NSDictionary *)adrBarOptions {
    float addressBarY = navBarHidden ? 20.0f : 0.0f;
//    BOOL animate = [adrBarOptions[@"animate"] boolValue];
    BOOL hide = [adrBarOptions[@"hide"] boolValue];
    float webViewY = addressBarY + (addressBarHidden ? 0.0f : 40.0f);
    float webViewHeight = [self view].frame.size.height - webViewY;

    if (hide && addressBarHidden == NO) {
        addressBarHidden = YES;
        self.addressBarView.hidden = YES;
        self.urlTextField.hidden = YES;
        webViewY = addressBarY;
        webViewHeight = [self view].frame.size.height - webViewY;
    } else if (!hide && addressBarHidden == YES) {
        addressBarHidden = NO;
        self.addressBarView.hidden = NO;
        self.urlTextField.hidden = NO;
        webViewY = self.addressBarView.frame.size.height;
        webViewHeight = [self view].frame.size.height - webViewY;
    }
    CGRect rectAddrBar = self.addressBarView.frame;
    rectAddrBar.origin.y = addressBarY;
    self.addressBarView.frame = rectAddrBar;

    CGRect rectWebView = self.webView.frame;
    rectWebView.origin.y = webViewY;
    rectWebView.size.height = webViewHeight;
    self.webView.frame = rectWebView;

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.view layoutSubviews];
    });
}

这是正常状态。

Normal State