刪除UIWebView的鍵盤

Question

當UIWebView中顯示的鍵盤上的accesory項目，則在頂部（附件項目）一個小工具欄，有按鈕「完成後，上一頁，下一頁」

目前，我使用以下作爲一種變通方法來刪除此工具欄：

https://gist.github.com/2048571

不過，我擔心這可能不是在iOS的未來版本。有沒有更好的方法來做到這一點？

Answer 1

首先，聽鍵盤事件：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; 

時，鍵盤會顯示，刪除工具欄：

- (void)keyboardWillShow:(NSNotification *)note { 
[self performSelector:@selector(removeBar) withObject:nil afterDelay:0]; 
} 

的removeBar如下：

- (void)removeBar { 
    // Locate non-UIWindow. 
    UIWindow *keyboardWindow = nil; 
    for (UIWindow *testWindow in [[UIApplication sharedApplication] windows]) { 
     if (![[testWindow class] isEqual:[UIWindow class]]) { 
      keyboardWindow = testWindow; 
      break; 
     } 
    } 

    // Locate UIWebFormView 
    for (UIView *possibleFormView in [keyboardWindow subviews]) { 
     if ([[possibleFormView description] hasPrefix:@"<UIPeripheralHostView"]) { 
      for (UIView* peripheralView in [possibleFormView subviews]) { 

       // hides the backdrop (iOS 7) 
       if ([[peripheralView description] hasPrefix:@"<UIKBInputBackdropView"]) { 
        //skip the keyboard background....hide only the toolbar background 
        if ([peripheralView frame].origin.y == 0){ 
         [[peripheralView layer] setOpacity:0.0]; 
        } 
       } 
       // hides the accessory bar 
       if ([[peripheralView description] hasPrefix:@"<UIWebFormAccessory"]) { 
        // remove the extra scroll space for the form accessory bar 
        UIScrollView *webScroll; 
        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 5.0) { 
         webScroll = [[self webView] scrollView]; 
        } else { 
         webScroll = [[[self webView] subviews] lastObject]; 
        } 
        CGRect newFrame = webScroll.frame; 
        newFrame.size.height += peripheralView.frame.size.height; 
        webScroll.frame = newFrame; 

        // remove the form accessory bar 
        [peripheralView removeFromSuperview]; 
       } 
       // hides the thin grey line used to adorn the bar (iOS 6) 
       if ([[peripheralView description] hasPrefix:@"<UIImageView"]) { 
        [[peripheralView layer] setOpacity:0.0]; 
       } 
      } 
     } 
    } 
} 

參考：https://github.com/don/KeyboardToolbarRemover/blob/master/src/ios/KeyboardToolbarRemover.m