关于自动调用textDidChange方法 的问题

在我的iPhone应用中有一个textfield，我希望在文本被改动的时候下面的方法能自动调用：

-(void)textFieldTextDidChangeOneCI:(UITextField*)tf{

NSLog(@"Testing Successful Value %.2f",appDelegate.p_ClinInf_Yes_V_InModel);
appDelegate.p_ClinInf_Yes_NV_InModel  = [[textFieldOne text] floatValue];

appDelegate.p_ClinInf_No_NV_InModel=100-appDelegate.p_ClinInf_Yes_NV_InModel;

textFieldTwo.text=[NSString stringWithFormat:@"%.2f",appDelegate.p_ClinInf_No_NV_InModel];
NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789."] invertedSet];
NSString*string=textFieldOne.text;
if ([string rangeOfCharacterFromSet:set].location != NSNotFound) {
    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Warning" message:@"Only a number can be entered into this input field " delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    [alert release];
    textFieldOne.text=@"";
}
NSLog(@"Testing Successful CI Data  %.2f",appDelegate.p_ClinInf_Yes_NV_InModel);

}

现在我用的方法：

[textFieldOne addTarget:self action:@selector(textFieldTextDidChangeOneCI:) forControlEvents:UIControlEventEditingChanged];