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WanFeiChen / gist:c84a9cea868cfa774cddf4a3423cf64a
Last active Nov 1, 2019
Setting associated userObject to UIView
View gist:c84a9cea868cfa774cddf4a3423cf64a
// UIView+SF.swift
// WechatTail
// Created by CHENWANFEI on 2019/9/22.
// Copyright © 2019 SwordFish. All rights reserved.
import UIKit
WanFeiChen / gist:2ec98991d16e7ce6a63b3207764e618b
Created Aug 17, 2019
How to use NSMetadataQuery in command line
View gist:2ec98991d16e7ce6a63b3207764e618b
let query = NSMetadataQuery();
query.searchScopes = ["/work/books"]
query.predicate = NSPredicate(format: "kMDItemFSName like %@", "NSHipster - Cocoa & Swift.pdf")
NotificationCenter.default.addObserver(forName: NSNotification.Name.NSMetadataQueryDidFinishGathering, object: query, queue: nil) { (_) in
print("count = \(query.resultCount)")
if let items = query.results as? [NSMetadataItem]{
for item in items{
if let path = item.value(forKey: NSMetadataItemPathKey) as? String{
View UIViewController+SF.swift
// UIViewController+SF.swift
// BowenEdu
// Created by CHENWANFEI on 2018/8/21.
// Copyright © 2018 swordfish. All rights reserved.
import UIKit
extension UIViewController{
WanFeiChen /
Last active Jul 10, 2018
Apache Tika + Tesseract-OCR to scan Chinese text in pdf
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
WanFeiChen / gist:f5cc44bf663f3722bd19097be47ccf9b
Last active Jul 24, 2019
let Android Activity's transition animation like iOS navigationController's push-pop one
View gist:f5cc44bf663f3722bd19097be47ccf9b
1.Override CommonActivity's startActivity and finish
public void startActivity(Intent intent) {
overridePendingTransition(R.anim.from_right_in, R.anim.from_left_out);
public void finish() {
WanFeiChen / gist:675de27e6ae59fd0bf20c49b87e72ed3
Last active Oct 13, 2017
Use AES/RSA encryption algorithm to make a KeyChain on Android
View gist:675de27e6ae59fd0bf20c49b87e72ed3
import android.content.Context;
import android.content.SharedPreferences;
import android.util.Base64;
import android.util.Log;
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