Delegate

README.md

@@ -18,6 +18,18 @@ pod 'TSCurrencyTextField', '~> 0.1.0'
 
 An example project is included in the Example directory. This should give you an idea how to use the class.
 
+###textFieldPublicDelegate
+Property was added to be able to call delegate method `- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;` if delegate exists to eventually decide if change should be made. Method is called with `string` parameter pointing to exactly the same string that will be put in text field right after method is called.
+It allows to block text field editing e.g. if maximum length is reached:
+
+```
+- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
+{
+    const int maxPriceStringLength = 10; // '$' + 7 digits + 2 commas, e.g. $1,123,456
+    return (string && string.length < maxPriceStringLength);
+}
+```
+
 ##Donate
 
 Please consider a small donation if you use TSCurrencyTextField in your projects.  It'll make me feel good.

TSCurrencyTextField/TSCurrencyTextField.h

@@ -14,4 +14,6 @@
 
 @property (nonatomic) NSNumber* amount;
 
+@property (nonatomic, strong) id<UITextFieldDelegate> textFieldPublicDelegate;
+
 @end

TSCurrencyTextField/TSCurrencyTextField.m

@@ -155,7 +155,14 @@ - (BOOL) textField: (TSCurrencyTextField *) textField shouldChangeCharactersInRa
     int distanceFromEnd = textField.text.length - (range.location + range.length);
 
     NSString* changed = [textField.text stringByReplacingCharactersInRange: range withString: string];
-    [textField setText: changed];
+
+    if (textField.textFieldPublicDelegate) {
+        if ([textField.textFieldPublicDelegate textField:textField shouldChangeCharactersInRange:range replacementString:changed]) {
+            [textField setText: changed];
+        }
+    } else {
+        [textField setText: changed];
+    }
 
     int pos = textField.text.length - distanceFromEnd;
     if ( pos >= 0 && pos <= textField.text.length )