UITextField使用代理获取已输入的内容

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{  //使用此方法将发生改变的部分替换成string即可  [self.testField.text stringByReplacingCharactersInRange:range withString:string]];    NSLog(@"string:%@",string);    if (isPhoneNumber) {        self.getCodeBtn.enabled = YES;    }else{        self.getCodeBtn.enabled = NO;    }    return YES;}