UItextView and back space click event on keyboard - ios

Question

I want to detect which character is removed on back space click event on keyboard in UITextView.
So if anybody knows solution please help.
Thanks in advance.

Answer 1

you should implement the protocol UITextViewDelegate method
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text;
and just get the text in range
try this to have a log (it's empty in case it's not a replacement but a new input)
- (BOOL) textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
NSLog(#"deleting this string: |%#|", [textView.text substringWithRange:range]);
return YES;
}
ps
remember to set your class as the delegate of your UITextView

Answer 2

Here's what you want. This method detects whenever a character is removed, and prints it to the console.
#interface ViewController ()<UITextFieldDelegate>
{
UITextField *textField;
NSString *currentText;
}
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 50, self.view.frame.size.width-40, 30)];
[textField addTarget:self action:#selector(textChanged:) forControlEvents:UIControlEventEditingChanged];
textField.delegate = self;
textField.borderStyle = UITextBorderStyleRoundedRect;
[self.view addSubview:textField];
}
-(void)textChanged:(UITextField *)sender{
if (!currentText) {
currentText = sender.text;
}
if (![currentText isEqualToString:sender.text]) {
//The text that is in the textField at the moment is shorter than it was the last time the textfield was editted... This shows that a backspace was pressed
if (currentText.length > sender.text.length) {
NSLog(#"Character: %#", [currentText substringFromIndex:sender.text.length]);
}
}
currentText = sender.text;
}
#end