How to limit iOS keyboard to numeric input

Set the keyboardType property of the UITextField to UIKeyboardTypeDecimalPad.

Swift 3

yourUITextField.keyboardType = .decimalPad

Objective-C:

Default to Numbers (but include - and . if you need to allow decimal or negative numbers):

myTextField1.keyboardType=UIKeyboardTypeNumbersAndPunctuation;

Default to Numbers (#s only for integer values)

myTextField1.keyboardType=UIKeyboardTypeNumberPad;