diff --git a/Classes/ZFTokenField.h b/Classes/ZFTokenField.h
index 8367fac..efb0e2e 100644
--- a/Classes/ZFTokenField.h
+++ b/Classes/ZFTokenField.h
@@ -29,6 +29,7 @@
 - (void)tokenFieldDidBeginEditing:(ZFTokenField *)tokenField;
 - (BOOL)tokenFieldShouldEndEditing:(ZFTokenField *)textField;
 - (void)tokenFieldDidEndEditing:(ZFTokenField *)tokenField;
+- (BOOL)tokenField:(ZFTokenField *)tokenField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
 @end
 
 @interface ZFTokenField : UIControl
@@ -42,4 +43,4 @@
 - (NSUInteger)numberOfToken;
 - (NSUInteger)indexOfTokenView:(UIView *)view;
 
-@end
\ No newline at end of file
+@end
diff --git a/Classes/ZFTokenField.m b/Classes/ZFTokenField.m
index d7b82a7..a8eddd2 100644
--- a/Classes/ZFTokenField.m
+++ b/Classes/ZFTokenField.m
@@ -257,4 +257,8 @@ - (BOOL)textFieldShouldReturn:(UITextField *)textField
     return YES;
 }
 
+- (BOOL)tokenField:(ZFTokenField *)tokenField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
+    return true;
+}
+
 @end