Clear the content of the UITextField's text property for tap - ios

I have a UITextField called place, it's text property contains an NSString. I would like to clear the existing content from the text property when the user taps into the text field.
I tried the code above, but nothing happened. I also tried it with the placeholder property, but it was the same. Do you have any idea what could be the problem? I think it should work.
- (void)textFieldDidBeginEditing:(UITextField *)textField {
self.place.text = nil;
}
2, version - in this case nothing appears in the text field from the beginning
- (void)viewDidLoad
{
[super viewDidLoad];
...
[self textFieldDidBeginEditing:place];
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
textField.text = nil;
}

There is a property clearsOnBeginEditing you can set to YES programmatically or there is a checkbox in Interface Builder.
If you also want to clear your placeholder
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
textField.placeholder = nil;
}
Double check that the UITextField self.place has it's delegate set to your view controller and validate that textFieldDidBeginEditing is being called.

Related

How to always hide keyboard but still can select textField value?

I want my UITextField doesn't show keyboard but the value still can be selected (for example, user wants to move cursor to any index in UITextField)
I have tried to do it this way:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self numberInput].delegate = self;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField{
[[self numberInput] resignFirstResponder];
}
but the result is, I can't select value from textField. Is there any workaround for this?
You can change the input of the textField.
If you pass an empty UIView, the keyboard will not appear and you should be able to select the text anyway. In swift 2.0:
textField.inputView = UIView()

NSLog Print when Enter Key is Pressed

I am trying to create a very basic app that has a text field and that prints out the value entered into the text field using NSLog when the return key is pressed. The code is below. So far, nothing seems to happen when text is put into the text field and I press enter. Can anyone assist?
#property (weak, nonatomic) IBOutlet UITextField *textfld;
- (void)viewDidLoad
{
[super viewDidLoad];
self.textfld.delegate = self;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)textFieldDidBeginEditing:(UITextField *)textfld {
}
- (void)textFieldDidEndEditing:(UITextField *)textfld {
NSLog(#"text is : %#",textfld.text);
}
http://pastie.org/9078792
http://pastie.org/9078793
Use - (BOOL)textFieldShouldReturn:(UITextField *)textField delegate method of UITextField in ViewController.m
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
NSLog(#"text is : %#",textfld.text);
return YES:
}
textFieldShouldReturn: asks the delegate if the text field should process the pressing of the return button. Read more.
set a breakpoint at line 27 self.textfld.delegate = self; and see if self.textfld is nil. That will tell you whether you correctly created your property and wired your textfield to that property in Interface Builder. Chances are you didn't...
Try this:
NSLog(#"%#",_yourtextfieldname.text);
NSLog(#"%#",self.yourtextfieldname.text);

perform an action after textfield selected by user?

(Iphone app) i would like to send one message after user select textfield, in that textfield only. but when ever we click on textfield keyboard appears.
Set the delegate of the UITextField and implement this method in the delegate:
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
// Do whatever you want
return NO;
}
Add UITextFieldDelegate in .h file and in .m file set Your yourTextField.delegate = self; and write this bellow code..
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
// write your messagehere
return NO;
}

clearing a UITextField when the user starts typing

short version: How can I make a UITextField box remove all content on the users first keypress? I don't want the info removed until the user starts typing something. ie, clearing it on begin edit is not good enough.
long version: I have three UITextField that loop around (using the return key and catching the press in the "shouldReturn" method. There is text already in the UITextField, and if the user doesn't type anything and just goes to the next UITextField, the value should stay (default behaviour).
But I want it that if the user starts typing, it automatically clears the text first. Something like having the whole field highlighted, and then typing anything deletes the fiels and then adds the user keypress.
"Clear when editing begins" is no good, because the text is immediately cleared on the cursor appearing in the field. That's not desired. I thought I could use the placeholder here, but that doesn't work as a default, and I can't find a default value property. The Highlighted and Selected properties don't do anything in this regard either.
There is a delegate method called
textFieldDidBeginEditing:(UITextField*) tf{
tf.startedEdinting = YES;
}
textFeildDidEndEditing: (UITextField*) tf {
tf.startedEditing = NO;
}
Add startEditing in a category to UITextField.
Then if value changes clear the field:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (textField.startEditing){
textField.text = string;
} else {
textField.text = [textField.text stringByReplacingCharactersInRange:range withString:string];
}
}
You can add the property to the UITextField category in the following way:
.h
#property (nonatomic, assign) BOOL startEditing;
.m
#dynamic startEditing;
- (void) setStartEditing:(BOOL)startEditing_in{
NSNumber* num = [NSNumber numberWithBool:startEditing_in];
objc_setAssociatedObject(self, myConstant, num, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL) startEditing{
NSNumber* num = objc_getAssociatedObject(self, myConstant);
return [num boolValue];
}
Declare a BOOL variable in your .h file like.
BOOL clearField;
And implement the delegate methods like:
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
clearField = YES;
}
-(void)textFieldDidEndEditing:(UITextField *)textField
{
clearField = NO;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
clearField = NO;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(clearField)
{
textField.text = #""
clearField = NO;
}
}
I want to thank people for their answers, I implemented both of the main methods described here and both worked flawlessly. But I have since come across a much simpler, nicer answer and involves only one line of code :)
In the textField's didBeginEditing method, place [self.textField selectAll:self]; or [self.textField selectAll:nil];
The original answer I found had selectAll:self but this shows the cut/copy/paste menu. If you send nil instead of self the menu doesn't appear.
Adding this one line of code highlights the text on entering the textField (so gives the user a visual cue), and only removes everything once a key is pressed.
Another solution that fulfils the same purpose is by simply using a text field placeholder which is defined as:
The string that is displayed when there is no other text in the text field.
So as soon as the user starts typing, the placeholder text disappears.
That's something you can set from the storyboard, or programmatically. (Yes it took me two hours trying to figure it the harder way.. when the solution was literally one line change of code).
If you want to clear the text one the user interacts with it, there is an option in interface builder to where you can set the text field to "Clear when editing begins."
Try to use the following method.
- (BOOL) textField: (UITextField *)theTextField shouldChangeCharactersInRange: (NSRange)range replacementString: (NSString *)string {
if(isFirsttime==YES)
{
textfield.text==#"";
isFirsttime=NO;
}
return YES;
}
Declare and initialize a NSString variable for your textField's initial text
NSString *initialText=#"initial text";
Then implement methods:
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
if(textField.text isEqualToString:initialText)
{
textField.text=#"";
}
}
-(void)textFieldDidEndEditing:(UITextField *)textField
{
if(textField.text isEqualToString:#"")
{
textField.text=initialText;
}
}

UITextField clear when selected, but also restore data if nothing is input

I have a table with UITextFields, and I want to make it so that when a textfield is selected, the current info is cleared (to allow new input), but if the user decides (after selecting) that they don't want to change it, I want them to be able to click elsewhere and the data from before reappears in the textfield.
Is there an easy way to do this?
A good way to do this that's nice and user friendly is to use the placeholder property. Set up your viewController as the textfield's delegate (as described by Andeh) then add the following code:
- (void)textFieldDidBeginEditing:(UITextField *)textField {
textField.placeholder = textField.text;
textField.text = #"";
}
- (void)textFieldDidEndEditing:(UITextField *)textField {
if (textField.text.length == 0) {
textField.text = textField.placeholder;
}
textField.placeholder = #"";
}
And you're done. If you have multiple UITextFields on the page and you don't want this behaviour for all of them you can add a check to the methods above.
In the textFieldDidBeginEditing delegate method, save the current value to a persisting variable before clearing the UITextField. Then in the didFinishEditing delegate method, if the new length of the user input is 0 set the text back to the stored value!
UITextField Delegate docs for reference.
First I think you have two sets of behaviors here.
The text field must clear the value when you begin editing. This exists: -clearsOnBeginEditing.
The text field must restore the previous text if text is empty. Subclassing seems the better solution.
Here is a possible sample class:
// MyRestoringTextField.h
#interface MyRestoringTextField : UITextField
#end
// MyTextField.m
#interface MyRestoringTextField ()
#property (strong, nonatomic) NSString *previousText;
#end
#implementation MyRestoringTextField
- (BOOL)becomeFirstResponder
{
BOOL result = [super becomeFirstResponder];
self.previousText = self.text;
return result;
}
- (BOOL)resignFirstResponder
{
BOOL result = [super resignFirstResponder];
if (self.text.length == 0)
self.text = self.previousText;
return result;
}
#end
Hope that helps.
To clear and then restore a textField if you fail to make an entry, use the following delegates as such:
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
[[NSUserDefaults standardUserDefaults] setObject:textField.text forKey:kTextFieldIdentifier];
textField.text = #"";
}
-(BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
if ([textField.text isEqualToString:#""])
textField.text = [[NSUserDefaults standardUserDefaults]
stringForKey:kTextFieldIdentifier];
return YES;
}
As of iOS 8.1, textFieldDidBeginEditing is already receiving a cleared text. You should use
-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField
to initialized the placeholder field.

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