在UITextView中获取当前键入的单词 [英] Get currently typed word in a UITextView
问题描述
我想在UITextView
中获取当前键入的单词.可以在此处 UITEXTVIEW中找到获取完全键入的单词的方法:在uitextview中键入了最近的单词,但是,我想在键入单词时得到该单词(无论它在哪里键入,UITextView
的开头,中间,结尾).
I want to get the currently typed word in a UITextView
. A way to get a completely typed word can be found here UITEXTVIEW: Get the recent word typed in uitextview, however, I want to get the word while it is being typed (no matter where it is typed, beginning, middle, end of UITextView
).
我想定义要键入的单词的是空格字符,后跟字母数字字符,或者如果当前位置(以某种方式用range.location
找出)是UITextView
的开头,那么应该考虑后续内容以及单词.当另一个空格字符跟在后面时,单词输入完毕.
I guess what defines a word being typed is a whitespace character followed by alphanumeric characters, or if the current location (somehow to figure out with range.location
) is the beginning of the UITextView
then whatever follows up should be considered as word as well. A word is finished being typed when another whitespace character follows.
我尝试过:
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text`
但是我在找到正确的范围时遇到问题.
but I have a problem finding the correct range.
简而言之:我需要在UITextView
中找到子字符串,其中子字符串是当前键入的单词.
In short again: I need to find the substring in a UITextView
, where substring is the currently typed word.
编辑:因为出现了问题.我正在使用NSLayoutManager
并将NSTextContainer
绑定到它,然后将它作为layoutManager传递给NSTextStorage
.
EDIT: Because the question came up. I'm using NSLayoutManager
and bind a NSTextContainer
to it, which then is passed as layoutManager to a NSTextStorage
.
EDIT2 :(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
的主要问题在于range.location
与指标不同,但总是少1.如果光标位于位置1,则输入一个字母后,range.location
将返回0.另外,UITextView
的text
属性似乎也被关闭了1.当文本为foobar
并且输出UITextView.text
时,我得到的是fooba
.因此range.location+1
返回异常Range {0, 1} out of bounds; string length 0'
EDIT2: The main problem with (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
is that the range.location
is not the same as the indicator is, but always 1 less. If the cursor is at position 1, after typing one letter, range.location
would return 0. Any way around this? In addition the text
attribute of UITextView
seems to be off by 1 as well. When the text is foobar
and I output the UITextView.text
then I get fooba
instead. Therefore range.location+1
returns the exception Range {0, 1} out of bounds; string length 0'
EDIT3 :
也许用NSTextStorage
而不是UITextView
更容易得到我想要的结果?
EDIT3:
Maybe it is easier to get my wanted result with the NSTextStorage
instead of UITextView
?
推荐答案
UITextView委托方法:-textView:textView shouldChangeTextInRange:range replacementText:text
实际执行的操作是询问是否应在
The UITextView delegate method : -textView:textView shouldChangeTextInRange:range replacementText:text
what actaully does is that it asks whether the specified text should be replaced in the text view in the specified range of textView.text
.
每次在将字符更新到文本视图之前键入一个字符时,都会调用此方法.这就是为什么在textView
中键入第一个字符时将range.location
设置为0的原因.
This method will be invoked each time when we type a charactor before updating that to the text view. That is why you are getting the range.location
as 0, when you type the very first character in the textView
.
仅当此方法的返回为true时,textView
才会使用我们在textView
中键入的内容进行更新.
Only if the return of this method is true, the textView
is getting updated with what we have typed in the textView
.
这是苹果提供的-textView:textView shouldChangeTextInRange:range replacementText:text
方法的参数的定义:
This is the definition of the parameters of the -textView:textView shouldChangeTextInRange:range replacementText:text
method as provided by apple:
范围:-当前的选择范围.如果范围的长度为0,则范围反映当前的插入点.如果用户按下Delete键,则范围的长度为1,并且一个空字符串对象替换了该单个字符.
文本:-要插入的文本.
range :- The current selection range. If the length of the range is 0, range reflects the current insertion point. If the user presses the Delete key, the length of the range is 1 and an empty string object replaces that single character.
text :- The text to insert.
因此,该方法的说明和您的要求可以满足,如下所示:
So this is what the explanation for the method and your requirement can meet like as follows:
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
//Un-commend this check below :If you want to detect the word only while new line or white space charactor input
//if ([text isEqualToString:@" "] || [text isEqualToString:@"\n"])
//{
// Getting the textView text upto the current editing location
NSString * stringToRange = [textView.text substringWithRange:NSMakeRange(0,range.location)];
// Appending the currently typed charactor
stringToRange = [stringToRange stringByAppendingString:text];
// Processing the last typed word
NSArray *wordArray = [stringToRange componentsSeparatedByString:@" "];
NSString * wordTyped = [wordArray lastObject];
// wordTyped will give you the last typed object
NSLog(@"\nWordTyped : %@",wordTyped);
//}
return YES;
}
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