Question

我遇到的问题是，当用户触摸搜索栏时，键盘显示正常。然后，当presentQR方法（见下文）被调用然后被解除然后触摸搜索栏时，键盘会出现，如屏幕截图所示，它会被偏移。这是iOS7;不确定这是否重要。

enter image description here

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];

}

Answer 1

1确保在QRReaderViewController中没有像重构窗口那样的东西。可能存在与UIWindow冲突的元素，导致无法正确显示键盘。（例如，不平衡的方向变化。）

2nd如果您没有找到任何内容，可以尝试使用以下代码访问键盘视图并尝试重置帧。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，以便知道它何时更改。

重新构建键盘：点击此处：https://stackoverflow.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*/
    }
}

触摸UISearchbar时如何修复偏移键盘

1 个答案: