I have implemented UITextViewDelegate in my ViewController,
After setting delegate to my TextView as
self.addressTextView.delegate=self;
Now i can only set the text as,
[self.addressTextView setText:#"Tamil Nadu, India"];
I am unable to edit the text using keybord. After Implementing shouldChangeTextInRange method only i am able to edit the content in UITextView.
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
return YES;
}
I dont know why?? is shouldChangeTextInRange compulsory if we implementing UITextViewDelegate
NO. Its not compulsary. You can set text like that
textView.text = #"Hello";
This method will be call when you are try to write somthing in your text view.
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
Its not compulsory in the protocol definition, so more than probably something else is going on. From reading that implementing the delegate method mentioned fixes this, its quite possible that your controller's superclass implements the method and only allows the text you've got above. If that's the case, the workaround you've implemented is in fact the easiest way to fix this.
For your information, everything that must be implemented when you declare that a class follows a protocol will be indicated by the compiler : you will get an error when you build if a method or a property is missing.
Related
I added a feedback box inside my IOS application, and I want it to take only text to submit the response from the user, but when I tried to enter a white spaces inside the box it took it as a text and accept the submitting! How can I prevent that?
Specify the UIViewController as the delegate to your text view (you can do this either programmatically or specify the delegate in Interface Builder); and
Your UITextViewDelegate method shouldChangeTextInRange needs to check to see if the string to be inserted contains a space:
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
if ([text rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].location != NSNotFound) {
return NO;
}
return YES;
}
I have a if/else statement in my objective-c code. The if/else statement runs like this:
-(void)textViewDidBeginEditing:(UITextView *)textView
{
if(textView==self.heardTextView)
{
NSString *string = textView.text;
if ([string rangeOfString:#"CLOSER"].location == NSNotFound)
{
NSLog(#"closest");
}
}
}
The premise of the if/else statement is - if the textview equals a certain word some code will run. But this code isn't running.
I have put a breakpoint on my code and a NSLOG and nothing.
check your text field delegate if you not set your delegate then it's not called..
In your Viewcontroller.H
select your textview give delegate on textview.
First you need to set the delegate of the text view. You can do this with Interface Builder, but if you prefer using code you can do this in the viewDidLoad method of your view controller:
myTextView.delegate = self;
Now, when do you want the NSLog statement to be executed? Right now it looks like it will be run only if you type "CLOSER", then make the text view lose focus and then click on it again.
If you want the NSLog to run as you type, you should use:
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
And also be careful, you need to calculate the next string value in the text field before testing its contents:
NSString *finalText = [textField.text stringByReplacingCharactersInRange:range withString:string];
Check your delegates, you must not have made the delegate of your textview as self. Check it once again. Or you might have done to some other class.
Needing to present user a multiline text field for comment entry, I am using a UITextView instead of a UITextField. I would like to use textFieldShouldReturn on my UITextView to send the data to server. How might I do that? Based on my readings so far, the method is only applicable to UITextField. So what is the equivalent for UITextView?
By adding the UITextViewDelegate to your viewControllerHeader
#interface ViewController : UIViewController<UITextViewDelegate>
This'll allow you access to the UITextViewDelegate methods of which there are a couple of which should allow you to know when the user has either pressed return or let you know when they have finished editing, for example
- (void)textViewDidEndEditing:(UITextView *)textView{
//From here you can action your methods to send the data to your server as required etc.
}
There's also this method
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
//Which you can use to listen for the #"\" return action if you prefer.
}
I hope this helps
I have a UITextView. I have the delegate for myTextView set to self and, when I do normal editing, this method calls just fine:
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
NSLog(#"Called");
}
In my app, I call in my code: [myTextView insertText:#"Hello World"];. When I do, I need to call textView:shouldChangeTextInRange:replacementText: after the text is inserted. How do I do this?
Call it explicitly. Call it before editing and only perform the edit if it returns YES. To call it explicitly you need to know the selected range (get the selected range with selectedTextRange), that's it. You already have the text to add and the text view.
Thanks for the answer, #Wain!
Here's what worked:
- (void)insertText
{
NSString *stringToAdd = #"Hello World";
NSString *replacementText = [myTextView.text stringByAppendingString:stringToAdd];
[napkinTextView insertText:stringToAdd];
[self textView:myTextView shouldChangeTextInRange:NSMakeRange(0, stringToAdd.length) replacementText:replacementText];
}
Currently, I test whether a UITextView is dirty or not by:
if ([self.textView.undoManager canUndo]) ...
Is this always correct? Or is there any isDirty-like method in UITextView?
You can listen to lots of things with the UITextViewDelegate
Check out the UITextViewDelegate documentation for comprehensive details
- (void)textViewDidBeginEditing:(UITextView *)textView
- (void)textViewDidEndEditing:(UITextView *)textView
- (void)textViewDidChange:(UITextView *)textView
There's more to do with shouldBegin and shouldEnd editing, and also selection changes.
Hope that helps out.