guzhenhuaGitHub’s gists

guzhenhuaGitHub / bitmapImage.swift

Created May 21, 2021 03:37

图像的绘制通常是指用那些以 CG 开头的方法把图像绘制到画布中，然后从画布创建图片并显示这样一个过程。这个最常见的地方就是 [UIView drawRect:] 里面了。由于 CoreGraphic 方法通常都是线程安全的，所以图像的绘制可以很容易的放到后台线程进行。

guzhenhuaGitHub / Cache.swift

Last active September 24, 2023 08:03

	import UIKit

	// According to article by John Sundell
	// https://www.swiftbysundell.com/articles/caching-in-swift/

	final class Cache<Key: Hashable, Value> {
	private let wrapped = NSCache<WrappedKey, Entry>()
	private let dateProvider: () -> Date
	private let entryLifetime: TimeInterval
	private let keyTracker = KeyTracker()

guzhenhuaGitHub / PopGestureConflictProtocol.swift

Last active June 14, 2019 10:49

解决scrollView右滑与系统右滑返回上级页面手势冲突

	/// 解决视图右滑与系统右滑返回上级页面手势冲突
	protocol PopGestureConflictProtocol {
	}

	extension UIViewController: PopGestureConflictProtocol {}
	extension PopGestureConflictProtocol where Self: UIViewController {

	/// 处理scrollView和系统右滑返回手势的冲突
	///
	/// 虽然self可能是某个UIViewController的子视图，但是不用管它。直接处理navigationController的手势冲突就行了

guzhenhuaGitHub / UIImage+roundCorner.swift

Created May 20, 2019 10:16

	public extension UIImage {
	/// 圆角图片
	func roundCornerImage(withCornerRadius cornerRadius: CGFloat) -> UIImage? {
	// 开关图形上下文
	UIGraphicsBeginImageContext(size)
	defer { UIGraphicsEndImageContext() }
	// 获取图形上下文
	let context = UIGraphicsGetCurrentContext()
	// 带圆角的长方形贝塞尔曲线
	let roundedRect = CGRect(x: 0, y: 0, width: size.width, height: size.height)

guzhenhuaGitHub / KeyPath.swift

Last active December 5, 2018 09:59

Sequence with KeyPath

	extension Sequence {
	func map<T>(_ keyPath: KeyPath<Element, T>) -> [T] {
	return map { $0[keyPath: keyPath] }
	}
	}

	extension Sequence {
	func sorted<T: Comparable>(by keyPath: KeyPath<Element, T>) -> [Element] {
	return sorted { a, b in
	return a[keyPath: keyPath] < b[keyPath: keyPath]

guzhenhuaGitHub / cow.sh

Created November 23, 2018 09:15

shell command, just for fun

alias cow=fortune | cowsay | lolcat

guzhenhuaGitHub / PasswordRule.swift

Last active October 24, 2018 02:40

Swift密码规则封装

	enum PasswordRule {
	enum CharacterClass {
	case upper, lower, digits, special, asciiPrintable, unicode
	case custom(Set<Character>)
	}

	case required(CharacterClass)
	case allowed(CharacterClass)
	case maxConsecutive(UInt)
	case minLength(UInt)

guzhenhuaGitHub / Vue.filter+Lodash.js

Last active September 27, 2018 02:14

add lodash functions to Vue.filter

	/* 将Lodash的方法注入到Vue的filter中 */
	_.each(_, (v, k) => {
	if (_.isFunction(v)) {
	Vue.filter('_' + k, (input, args) => {
	return v.apply(_, _.flatten([[input], args]))
	})
	}
	})

guzhenhuaGitHub / EachConsecutive.swift

Created September 21, 2018 03:47

helper like ruby's Enumerable#each_cons

	extension Collection {
	func eachConsecutive(_ size: Int) -> [[Element]] {
	let droppedIndices = indices.dropFirst(size - 1)
	return zip(indices, droppedIndices)
	.map {
	return Array(self[$0...$1])
	}
	}
	}

guzhenhuaGitHub / EachSlice.swift

Created September 21, 2018 03:46

helper like ruby's Enumerable#each_slice

	extension Array {
	func eachSlice(_ step: Int) -> [[Element]] {
	return stride(from: 0, through: count, by: step)
	.lazy
	.map { from in
	let to = Swift.min(from + step, count)
	return (from..<to)
	.lazy
	.map { [self[$0]] }
	.reduce([], +)

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