acalism

private let kEllipsesCharacter = "\u{2026}"

/// This componet is designed to resolve those problems:
/// 1. Calculate frame.
/// 2. TouchableLinks.
/// 3. Line/Height limits and followed by "..."/"...全文"/... .
class BKLabel: UIView {

    /// 文本内容
    var attributedText: NSAttributedString? {

acalism

// 原问题：https://blog.csdn.net/harry_lyc/article/details/7715639

func findMinMax<T: Comparable>(_ array: [T]) throws -> (T, T) {
    guard array.count > 0 else {
        throw NSError()
    }
    var min: T = array[0], max: T = array[0]
    // 比较次数 O(2n)
//    for value in array {
//        if value < min {

acalism

// 1. for 循环条件筛选
let urlStrings: [String?] = ["https://baidu.com", nil, "https://im.qq.com"]
for case let urlString? in urlStrings where !urlString.isEmpty {
  if let u = URL(string: url) {
    print(u)
  }
}

// 2. 

acalism

import UIKit
import UserNotifications
import UserNotificationsUI

// 可考虑在 info.plist 里限定初始高与屏幕高的比例，比如 0.3，但不建议使用1。体验一下加载图片的效果就知道为什么了
class NotificationViewController: UIViewController, UNNotificationContentExtension {

    //@IBOutlet var label: UILabel?
    @IBOutlet var imageView: UIImageView! // 建议在storyboard限定图片最大高度和最大宽度，避免图片被截断
    //@IBOutlet var containerView: UIView!

acalism

import UserNotifications
import MobileCoreServices

class NotificationService: UNNotificationServiceExtension {

    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.contentHandler = contentHandler

acalism

import Foundation

// Because NSString using UTF-16, so the following answer is suitable.
// Update for Swift 4 (Xcode 9):
extension String {

    /// 将 Range 转为 NSRange
    ///
    /// - Parameter range: 要转换的range
    /// - Returns: 转换后的结果（如果range合法，那么nsRange就不会是nil）

acalism

// CFBundleIcons
// https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html#//apple_ref/doc/uid/TP40009249-SW13

if #available(iOS 10.3, *) {
    UIApplication.shared.setAlternateIconName("AppIcon-alternate", completionHandler: { (error) in
        //
    })
} else {
    // no Fallback on earlier versions
}

acalism

import Foundation
import MobileCoreServices


if let t = UTTypeCreateAllIdentifiersForTag(kUTTagClassFilenameExtension, "mp4" as CFString, nil)?.takeRetainedValue() as? [CFString] {
    print(t)
    print(UTTypeConformsTo(t[0], kUTTypeMovie), "\n")
}

if let t = UTTypeCreateAllIdentifiersForTag(kUTTagClassMIMEType, "application/json" as CFString, nil)?.takeRetainedValue() as? [CFString] {

acalism

protocol InstantMap {
    func instantMap<T>(_ transform: (Self)->T) -> T
    func instantFlatMap<T>(_ transform: (Self)->T?) -> T?
}

extension InstantMap {
    func instantMap<T>(_ transform: (Self)->T) -> T {
        return transform(self)
    }
    func instantFlatMap<T>(_ transform: (Self)->T?) -> T? {

acalism

// 需要在 xxx-Bridging-Header.h 中引入 CommonCrypto 
// #import <CommonCrypto/CommonCrypto.h> // add to your xxx-Bridging-Header.h
// 所以在 playground 中无法测试下面的代码 ( NOT work with Playground )


// 阅读代码时注意以下几点：
// 1. Data 本质是 UInt8 数组，所以 String.utf8.count 与 Data.count 是相等的（String 转换成 Data 前后）
// 2. 如果一个C方法接受的参数类型是 void*，即 Swift 里的 UnsafeRawPointer，那么它也接受 UnsafePointer<T> 类型
// 3. 如果某个方法接受 UnsafePointer<UInt8> 类型参数，那么直接填入 String 也是可以的