xcode 为什么我的 UITextView 中没有显示键盘？

Why does the keyboard not show in my UITextView?

提问by madmax

I have a container class which is a view controller.
It holds the UITextView for notes and has another view controller as a subview, called it PDFViewController. That one has an array of view controllers, called them PageViewController's, in it and a UIScrollView so i can swipe through the different view controllers from the array.

我有一个容器类，它是一个视图控制器。
它保存用于笔记的 UITextView，并有另一个视图控制器作为子视图，称为 PDFViewController。那个有一个视图控制器数组，称为 PageViewController's，在它和一个 UIScrollView 中，所以我可以从数组中滑动不同的视图控制器。

Each of the PageViewController's has also an UIScrollView, so i can zoom the different pages.

每个 PageViewController 也有一个 UIScrollView，所以我可以缩放不同的页面。

But when I show my UITextView i cannot edit or write anything.
It shows a blinking cursor, but no keyboard and can't write text.
When i highlight a word from the default text, it shows me some dictionary options but the words won't be replaced.

但是当我显示我的 UITextView 时，我无法编辑或写任何东西。
它显示一个闪烁的光标，但没有键盘并且不能写文本。
当我从默认文本中突出显示一个单词时，它会向我显示一些字典选项，但这些单词不会被替换。

I just don't know where the problem might be.

我只是不知道问题可能出在哪里。

container.m (View Controller)

container.m（视图控制器）

- (void) initNotes {

notesVisible = FALSE;
notes = [[UITextView alloc]initWithFrame:CGRectMake(10, 10, note_width, note_height)];
notes.backgroundColor = [UIColor yellowColor];
notes.font = [UIFont fontWithName:@"Arial" size:24];  
notes.text = @"Hier ist Platz für Ihre Notizen";

container = [[UIView alloc] initWithFrame:CGRectMake(start_x, start_y, container_width, container_height)];
container.backgroundColor = [UIColor yellowColor];
[container.layer setShadowColor:[[UIColor blackColor] CGColor]];
[container.layer setShadowOffset:CGSizeMake(2.0, 3.0)];
[container.layer setShadowOpacity:0.6];
[container.layer setShadowRadius:5];
container.layer.shouldRasterize = YES;
[container addSubview:notes];
[self.view addSubview:container];
}

- (void) showTextView {
[UIView beginAnimations:@"MoveAndStrech" context:nil];
[UIView setAnimationDuration:0.4];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

container.frame = CGRectMake(start_x, self.view.center.y-container_height, container_width, container_height); 

[UIView commitAnimations];

notesVisible = !notesVisible;
}

- (void) hideTextView {

[UIView beginAnimations:@"MoveAndStrech" context:nil];
[UIView setAnimationDuration:0.4];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];

container.frame = CGRectMake(start_x, start_y, container_width, container_height); 

// [notes resignFirstResponder];
[UIView commitAnimations];

notesVisible = !notesVisible;
}

@implementation PDFViewController

@implementation PDFViewController

- (void)awakeFromNib
{
painting = false;
dataInstance = [PDFDataInstance sharedInstance];
chapter = [dataInstance chapter];
[self getNumberOfPages];
kNumberOfPages = dataInstance.pages;

// Register observer to be called when a cell from BookmarkPDFController is pressed
[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(didSelectBookmark:) 
                                             name:@"bookmarkPressedinPDFView" object:nil];
// Register observer to be called when a cell from BookmarkPDFController is pressed
[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(togglePainting:) 
                                             name:@"togglePainting" object:nil];

    // view controllers are created lazily
// in the meantime, load the array with placeholders which will be replaced on demand
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < kNumberOfPages; i++)
{
    [controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;
[controllers release];

// a page is the width of the scroll view
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * kNumberOfPages, scrollView.frame.size.height);
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.delegate = self;
scrollView.directionalLockEnabled = YES;

currentPage = [[chapter currentPage] integerValue];


// pages are created on demand
// load the visible page
// load the page on either side to avoid flashes when the user starts scrolling
// 
// Load pages based on currentPage cause of when coming from bookmarks
[self loadScrollViewWithPage:currentPage];
[self loadScrollViewWithPage:currentPage+1];

// update the scroll view to the appropriate page
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * currentPage;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];


}

- (void)loadScrollViewWithPage:(int)page
{
if (page < 0)
    return;
if (page >= kNumberOfPages)
    return;

// replace the placeholder if necessary
PageViewController *controller = [viewControllers objectAtIndex:page];
if ((NSNull *)controller == [NSNull null])
{
    //page+1 cause CGPDF indexing starts with 1
    controller = [[PageViewController alloc] initWithPageNumberAndUrl:page+1: [chapter urlOnFilesystem]];
    [viewControllers replaceObjectAtIndex:page withObject:controller];
    [controller release];
}

// add the controller's view to the scroll view
if (controller.view.superview == nil)
{
    CGRect frame = scrollView.frame;
    frame.origin.x = frame.size.width * page;
    frame.origin.y = 0;
    controller.view.frame = frame;

    [scrollView addSubview:controller.view];

}
}

TextView delegates

TextView 委托

- (void)textViewDidBeginEditing:(UITextView *)textView {

NSLog(@"begin editing");
}

- (BOOL)textView:(UITextView *)aTextView shouldChangeTextInRange:(NSRange)aRange replacementText:(NSString*)aText
{
NSLog(@"something changed"); 
return YES; 
}

回答by LiweiZ

Just want to add another possibility here. In the iOS simulator, make sure the "Hardware/Keyboard/Connect Hardware Keyboard" is not checked. It took me a couple of hours to figure out this. I guess I toggled that option by accidently pressing the shortcut. Not good experience :(

只是想在这里添加另一种可能性。在 iOS 模拟器中，请确保未选中“硬件/键盘/连接硬件键盘”。我花了几个小时才弄清楚这一点。我想我不小心按下了快捷方式切换了该选项。不好的体验:(

As pictured, Connect Hardware Keyboard should be UN-checked.

如图，连接硬件键盘应该是未选中的。

回答by Nir Golan

No one asked , but have you set :

没有人问，但你有没有设置：

notes.editable = YES ; 

?

?

回答by lostInTransit

Is the UITextView receiving touches? Implement the UITextViewDelegate methods and see if they get called (esp textViewDidBeginEditing:and textView: shouldChangeTextInRange: replacementText:). This way you'll know for sure whether the text view is indeed handling the touches or not.

UITextView 是否接收触摸？实施UITextViewDelegate方法，看看他们是否得到所谓（ESP textViewDidBeginEditing：和TextView的：shouldChangeTextInRange：replacementText： ）。这样你就可以确定文本视图是否确实在处理触摸。

If it does, then I don't see anything wrong with your code (except you might have accidentally added a view overlapping the textview)

如果是这样，那么我看不出您的代码有任何问题（除非您可能不小心添加了与 textview 重叠的视图）

回答by Adarsh V C

Make sure that in the delegate of your textview. Following method is returning YES.

确保在你的 textview 的委托中。以下方法返回YES。

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
  return YES;
}

回答by Nicolas S

Try without container, just use the UITextView (notes) as the container itself. Every time you used container use notes instead.

尝试不container使用，只需使用 UITextView ( notes) 作为容器本身。每次使用容器时，请改用注释。

And then dont:

然后不要：

[container addSubview:notes];
[self.view addSubview:container];

Just:

只是：

[self.view addSubview:notes];

Tell me how it goes

告诉我进展如何

回答by Nicolas S

After you have set the notes delegates, do the following.

设置笔记代表后，请执行以下操作。

- (void)textViewDidBeginEditing:(UITextView *)textView {
    if ([textView isEqual:notes]) {
        NSLog(@"notes begin editing");
    }
}

- (BOOL)textView:(UITextView *)aTextView shouldChangeTextInRange:(NSRange)aRange replacementText:(NSString*)aText {
    if ([aTextView isEqual:notes]) {
        NSLog(@"something changed in notes");
    }

    return YES; 
}

This should confirm delegates of notes are indeed getting called.

这应该确认笔记的代表确实被召唤了。

回答by GraehamF

I had similar behavior, the UITextViewnot responding to touches and the keyboard not showing.

我有类似的行为，UITextView没有响应触摸和键盘没有显示。

My UITextViewwas layered on top of a UICollectionViewwhich was receiving all the touches even though the UITextViewwas visibly on top.

我的UITextView被分层在一个UICollectionView接收所有触摸的顶部，即使它UITextView明显在顶部。

I fixed it by adjusting the frame of the UICollectionViewso that the UITextViewhas nothing behind it. After that, all the delegate methods were called like a charm.

我通过调整框架来固定它，UICollectionView使其UITextView后面没有任何东西。之后，所有的委托方法都像魅力一样被调用。

Hope this helps.

希望这可以帮助。

回答by Kapil Mandlik

you need to implement your container class with UITextViewDelegate and add notes.delegate=self; just after initialize the notes object in initNotes method.

你需要用 UITextViewDelegate 实现你的容器类并添加 notes.delegate=self; 在 initNotes 方法中初始化 notes 对象之后。

回答by Rachit

Check for 2 things:

检查两件事：

1. Is notes.editable = YES; if so please change it to NO.

1. 是 notes.editable = YES; 如果是，请将其更改为 NO。

2.Check whether your UITextView delegates are called are not. If not Please make sure you include in your implementation file and set notes.delegate = self.

2.检查您的 UITextView 委托是否被调用。如果不是请确保您包含在您的实现文件中并设置 notes.delegate = self。

回答by Avinash shirsath

please Refer this one. where ContantView is your view/textfield and _bubbletable is your table.

请参考这个。其中 ContantView 是您的视图/文本字段，_bubbletable 是您的表。

- (void)keyboardWasShown:(NSNotification*)aNotification
 {
 NSDictionary* info = [aNotification userInfo];
 CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

  [UIView animateWithDuration:0.2f animations:^{

    CGRect frame = _ContantView.frame;
    frame.origin.y -= kbSize.height;
    _ContantView.frame = frame;

    frame = _bubbleTable.frame;
    frame.size.height -= kbSize.height;
    _bubbleTable.frame = frame;

}];

}

}