juwencheng

extension Dictionary {
    mutating public func setValue(value: Any, forKeyPath keyPath: String) {
        var keys = keyPath.components(separatedBy: ".")
        guard let first = keys.first as? Key else { print("Unable to use string as key on type: \(Key.self)"); return }
        keys.remove(at: 0)
        if keys.isEmpty, let settable = value as? Value {
            self[first] = settable
        } else {
            let rejoined = keys.joined(separator: ".")
            var subdict: [NSObject : AnyObject] = [:]

juwencheng

# thanks to https://gist.github.com/dergachev/4627207

ffmpeg -i Wave.mov -r 10 -f gif - | gifsicle --optimize=3 --delay=3 > out.gif

juwencheng

NSString *s = @"😀";
    
__block NSInteger count = 0;
[s enumerateSubstringsInRange:NSMakeRange(0, s.length) options:NSStringEnumerationBySentences usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
    count++;
}];
NSLog(@"%d", count);

juwencheng

docker 常用命令查询手册

docker 相关

# 查询 docker 命令
docker --help

# 停止 docker 服务
sudo service docker stop

juwencheng

- (NSString *)responseString
{
    NSData *data = [self responseData];
    if (!data) {
        return nil;
    }
    //明确表示用 gbkEncoding 进行解码
    NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    return [[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:gbkEncoding];
}

juwencheng

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">
    <dict>
        <!-- array of downloads. -->
        <key>items</key>
        <array>
            <dict>

                <!-- an array of assets to download -->

juwencheng

// original : https://stackoverflow.com/questions/24303883/uicollectionview-with-paging-enable
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView
                     withVelocity:(CGPoint)velocity
              targetContentOffset:(inout CGPoint *)targetContentOffset
{
    CGFloat cellWidth = self.cellWidth;
    CGFloat cellPadding = 9;

    NSInteger page = (scrollView.contentOffset.x - cellWidth / 2) / (cellWidth + cellPadding) + 1;

juwencheng

const static NSString * const strings[] = {
        [0] = @"string_1",
        [1] = @"string_2",
        [2] = @"string_3",
        [3] = @"string_4",
        // ...
    };

juwencheng

// import the library
import PropTypes from 'prop-types';

// define a component
class Greeting extends React.Component {
  render() {
    return (
      <h1>Hello, {this.props.name}</h1>
    );
  }

juwencheng

import React, { Component } from 'react'
import { AppRegistry, View, Text, ActivityIndicator, ScrollView, StyleSheet } from 'react-native'

class App extends Component {

  state = {
    loading: true,
    error: false,
    posts: [],
  }