textView 的ReturnKey点击处理

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if ([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        /// 调用你需要处理的事情  ///
        return NO;
    }
    return YES;
}

textField 的ReturnKey点击处理

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    /// 调用你需要处理的事情  ///
    return YES;
}