触摸 UISearchbar 时如何修复偏移键盘

Posted 2023-02-24

【中文标题】触摸 UISearchbar 时如何修复偏移键盘

【英文标题】：How to fix offset keyboard when UISearchbar is touched

【发布时间】：2013-10-16 13:20:44

【问题描述】：

我遇到的问题是，当用户触摸搜索栏时，键盘看起来很好。然后，当presentQR 方法（见下文）被调用然后解除，然后触摸搜索栏时，键盘出现如屏幕截图所示的偏移位置。这是ios7；不知道这是否重要。

我正在使用以下代码添加 UISearchbar：

    // search bar
UIView *searchBarView = [[UIView alloc] initWithFrame:CGRectMake(90.0, 0.0, 200.0, 44.0)];
searchBarView.autoresizingMask = 0;

searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 190, 40)];
searchBar.backgroundImage = [[UIImage alloc] init];
searchBar.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.navigationItem.titleView = searchBar;
searchBar.delegate = self;


[[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],UITextAttributeTextColor,[UIColor whiteColor],UITextAttributeTextShadowColor,[NSValue valueWithUIOffset:UIOffsetMake(0, -1)],UITextAttributeTextShadowOffset, nil] forState:UIControlStateNormal];

UITextField *textfield = [[UITextField alloc] init];
searchBar.placeholder = @"City Search";

// hide magnifying glass
textfield = nil;

for (UIView* subView in searchBar.subviews) 
    if ([subView isKindOfClass:[UITextField class]]) 
        textfield = (UITextField*)subView;
        [(UITextField*)subView setTextColor:[UIColor whiteColor]];
        [(UITextField*)subView setFont:[UIFont fontWithName:@"DIN-Regular" size:18]];

        textfield.leftViewMode = UITextFieldViewModeNever;
        textfield.rightViewMode = UITextFieldViewModeAlways;

        break;
    



UIButton *cancelButton;
for (id button in searchBar.subviews)

    if ([button isKindOfClass:[UIButton class]])
    
        cancelButton=(UIButton*)button;
        break;
    


 [searchBar addSubview:textfield];
 [searchBarView addSubview:searchBar];

self.navigationItem.titleView = searchBarView;




   -(void)presentQR 

    QRReaderViewController *qr = [[QRReaderViewController alloc]initWithNibName:@"QRReaderViewController" bundle:nil];

    UIButton *removeQRBtn=[UIButton buttonWithType:UIButtonTypeCustom];
    removeQRBtn.frame=CGRectMake(260, 10, 60, 40);
    [removeQRBtn addTarget:self action:@selector(removeQR) forControlEvents:UIControlEventTouchDown];
    [removeQRBtn setImage:[UIImage imageNamed:@"qrcode.png"] forState:0];

    [qr.view addSubview:removeQRBtn];
    qr.view.backgroundColor = customColorGrey;
    qr.modalPresentationStyle =  UIModalTransitionStyleCrossDissolve;
 //   [self presentModalViewController:qr animated:YES];
    [self presentViewController:qr animated:YES completion:nil];



-(void)removeQR 

 //   [self dismissModalViewControllerAnimated:YES];
    [self dismissViewControllerAnimated:YES completion:nil];

【问题讨论】：

你能上传更多截图吗？在做presentQR之前

【参考方案1】：

1st 确保在 QRReaderViewController 中没有类似重构窗口之类的东西。可能存在与 UIWindow 冲突的元素，导致键盘无法正确显示。 （例如不平衡的方向变化。）

2nd 如果您在那里没有找到任何东西，您可以尝试使用以下代码访问键盘视图并尝试重置框架。您可以将此代码放在keyboardWillShow方法中（需要注册通知）

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWindow_Class/UIWindowClassReference/UIWindowClassReference.html#//apple_ref/c/data/UIKeyboardWillShowNotification

PS。我建议只记录键盘框架，以便您知道它何时更改。

重构键盘：在这里找到：https://***.com/a/10957843/1017340

//The UIWindow that contains the keyboard view - It some situations it will be better to actually
//You need to iterate through each window to figure out where the keyboard is, but In my applications case
//I know that the second window has the keyboard so I just reference it directly
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];


//Because we cant get access to the UIPeripheral throughout the SDK we will just use UIView.
//UIPeripheral is a subclass of UIView anyways
UIView* keyboard;

//Iterate though each view inside of the selected Window
for(int i = 0; i < [tempWindow.subviews count]; i++)

    //Get a reference of the current view
    keyboard = [tempWindow.subviews objectAtIndex:i];

    //Assuming this is for 4.0+, In 3.0 you would use "<UIKeyboard"
    if([[keyboard description] hasPrefix:@"<UIPeripheral"] == YES) 
    
        NSLog(@"Keyboard Frame: %@",NSStringFromCGRect(keyboard.frame));
        //HERE : try reframing the keyboard 
        //[keyboard setFrame:CGRectMake(...)]; /*NOT TESTED NOT RECOMMENDED*/