OC-监听键盘上return键点击事件

• UISearchBar：在searchBarSearchButtonClicked:代理方法写入实现代码即可

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    NSLog(@"点击了搜索商品输入框,跳转到商品列表");
}

• UITextField：在textFieldShouldReturn:代理方法写入实现代码即可

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
   NSLog(@"输入完成收起键盘");
   return YES;
}