UITextField Should accept number only values

Question

I have UITexfields i want that it should accept only number other shows alert that enter a numeric value. I want that motionSicknessTextFiled should only accept number

NSString*dogswithMotionSickness=motionSicknessTextField.text; NSString*valueOne=cereniaTextField.text; NSString*valueTwo=prescriptionTextField.text; NSString*valueThree=otherMeansTextField.text; NSString*valueFour=overtheCounterTextField.text; 

Answer 1

In whatever UITextField you're getting these values from, you can specify the kind of keyboard you want to appear when somebody touches inside the text field.

E.G. a numeric-only keyboard.

Like this screenshot:

This is easily set when working with the XIB and the Interface Builder built into Xcode, but if you want to understand this programmatically, take a look at Apple's UITextInputTraits protocol reference page, specifically the keyboardType property information.

To filter out punctuations, set the textfield's delegate and set up the shouldChangeCharactersInRange method:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {     NSCharacterSet *numbersOnly = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];     NSCharacterSet *characterSetFromTextField = [NSCharacterSet characterSetWithCharactersInString:textField.text];      BOOL stringIsValid = [numbersOnly isSupersetOfSet:characterSetFromTextField];     return stringIsValid; }