I am making an UITextField input where user can enter an subdomain for their site. What i want to accomplish is, that i can show the whole url in the input but only the subdomain part is editable. Any tips how to accomplish that?
Update
The right solutions was to use UILabel in UITextField's rightView and calculating the position in rightViewRectForBounds.
First, UITextField has a property named AttributePlaceholder, it allows to display different color of placeholder.
And then when didBeginEditing:, fill the textfield with url, without the subdomain. Remember the count of characters.
When user editing, called on the method:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
Return NO when textfield.text.count <= characters.count
Related
I want to prevent cursor back movement in UITextField. or I need to prevent entering text between two characters which is already entered.
How can I do this?
There is no property or method to prevent the user from using the magnifying glass on a particular text field. You can try to block all the characters inside the string:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if(range.location < textField.text.length) return NO; else return YES;
}
After some research, I found this question: Disable Magnifying Glass in UITextField. The author of the accepted answer says there's a way to do it:
You can also set userInteractionEnabled to NO so that the user can't
tap the field. Call becomeFirstResponder manually so that the field
gets focus since the user can't tap to focus.
But, as I found out, it doesn't work, since setUserInteractionEnabled:NO prevents the text field from becoming the first responder. After the second research I found another question: Show UITextField keyboard on firstResponder even when userInteractionEnabled = NO. MaxGabriel user claims he found the way to do it:
What I do is add that hidden text field to the view, and call
becomeFirstResponder on it. The user has no idea this text field
exists. In the delegate callback from the text field, I take the text
the user typed in and add it to a UITextView (though you could add the
text to whatever you wanted, like a UITextField like in your
question). I turn off userInteractionEnabled for the visible text
view. This creates the effect you desire.
Stack Overflow is a huge database, a little bit of research before asking a question may help you in the future.
For stopping entering text in UiTextField, you should use uitextfield delegate method
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
//Set tag for a textfield
if(textField.tag==10)
{
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return (newLength < [textField.text length]) ? NO : YES;
}
}
Modify the logic as per your requirement.
For preventing entering text between two characters Use NSRange and textfield text of range is less than textfield text length then return No then text will not be entered in UITextField
You cannot prohibit caret moving, but you can use UITextFieldDelegate's method textField:shouldChangeCharactersInRange:replacementString: for testing if text was typed inside already typed string, if it's not then change text in textfield manually and move caret to the end with the help of selectedTextRange property of UITextInput protocol.
I have a TextField which I would only like the end user to enter monetary values into, e.g. 20000. I would like the field to automatically display the entered numbers with a display mask, so that when the user enters the keystrokes it changes the field contents dynamically. E.g. 2000050 entered would display as 20,000.50.
You use the
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string`
delegate method. In the method look at what the string currently is (textField.text), what it will be after applying the replacement string, then create your own formatted string and set it using textField.text = "20,000.50" etc. Return NO since you handled the text.
I know that if you use the following line of code, you can detect what the user has typed in a TEXT VIEW.
if ([[textView text] isEqualToString:#"")
I want to detect whether the user has typed anything in a text FIELD, and this does not work with text fields. What should I change? Thanks for your help!
The UITextFieldDelegate is the preferred way to find this out.
- (void)textFieldDidBeginEditing:(UITextField *)textField - this will only tell you that it has become the first responder / key field, this does not guarantee that the user modified the value
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string - this method will tell you when ever the user hits a key to change the text, a "paste" will cause multiple characters to be in the string, backspace over one, or delete of a selection will cause the string to be empty, …
- (void)textFieldDidEndEditing:(UITextField *)textField - this is a common location to check the value in the field against the value in the model to see if an edit has occurred. this will only be called when the field relinquishes "key" status, note that a user could tap a button to cause the whole view to go away before this is called, often making it useful to track if any field you are interested in becomes the "key field" (see first method)
it can be useful to set break points in relevant implementations to familiarize yourself with their call order/logic
You can retrieve contents of a UITextField the same way you can a UITextView, by accessing the "text" property. The code below is if a text field is not empty.
if (![someTextField.text isEqualToString:#""])
{
NSLog(#"someTextField is not empty");
}
You can also use the UITextField delegate to detect when a user starts typing, stops typing, etc. More information about that is available in the documentation.
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITextFieldDelegate_Protocol/UITextFieldDelegate/UITextFieldDelegate.html#//apple_ref/doc/uid/TP40006991
Finally, here's a link to the UITextField docs.
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITextField_Class/Reference/UITextField.html#//apple_ref/doc/uid/TP40006888
you can check for text length instead of content
if ([[textView text] length]==0)
The user should not be able to move the cursor of a UITextField somwhere else in the entered string.
I need this because I want the user to enter a currency amount. This is done by letting the user enter numbers which will be added to the end of the amount and the commata will be moved to the third position from the end.
How do I force the cursor in an UITextField to stay at the end of an entered string?
Place a UIButton over your UITextField. Add an IBAction to the button and have it call UITextField.becomeFirstResponder().
This prevents clicks from passing, cursors for being able to be modified, but still allows the user to click the view and select it.
I solved the problem by hiding the original entry field and show the value formatted in a label. This prevents the user from changing the cursors position.
Create a subclass of UITextField with
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { return NO; }
to disable all gestures on that field. This implies that you make that field the firstResponder programmatically though.
I think you can use:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
Just give him the correct range.
I have a UITextField only allow users to enter the number, which is amount of money. when user types 10000, the textfield will show € 10.000. And it will change dynamically when user types or backspace in the textfield. How do I implement it in iPhone?
You'd want to give the UITextField a delegate and implement something for
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
in that delegate that checked to see if the field's format was valid and altered the text if so, inserting the characters in the selected location, inserting / removing the . / currency symbol, then returning NO.
The tricky part is that the insertion point jumps to the end of the field whenever you replace the field's text - there are some undocumented APIs to retrieve / set its position, but not any official ones. Not a problem in most cases, since a user isn't very likely to move the insertion point in a field this small, but you might get a few complaints.