About a year ago, the technique seemed like God hand to me.

I found the Apple official UI tool to build the search function on the APP right after I released Catch Questions. But, the function was composed from some difficult scripts so I had not customized it at all for a long time. It took a year for me to understand some of them so that I finally created the search engine to find the inner data of folder.

-Attention
The search box is located at the top of Catch and Question pages. You have to type at least 2 letters as the key word to search something. Originally, 1 letter was available while the processing speed was very low so I forbid the 1 letter search.