WKWebView 设置Cookie

WKUserScript *cookieScript = [[WKUserScript alloc] initWithSource:@"document.cookie='X-Tag=gray;'" injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
[_webView.configuration.userContentController addUserScript:cookieScript];

NSURL *aURL = [NSURL URLWithString:url];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:aURL];
[_webView loadRequest:request];

Reachability

https://developer.apple.com/library/archive/samplecode/Reachability/Reachability.zip

麦克风权限检测

// 检测麦克风授权
- (void)checkAudioAuthorization {
    kWeak(weakSelf);
    void(^showUngrantedAlert)(void) = ^{
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"麦克风未授权" message:@"请前往设置中开启，否则会导致通话没有声音。" preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:@"前往设置" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            NSURL *aURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
            if([UIApplication.sharedApplication canOpenURL:aURL]) {
                [UIApplication.sharedApplication openURL:aURL options:@{} completionHandler:nil];
            }
        }]];
        [weakSelf presentViewController:alert animated:YES completion:nil];
    };
    
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
    switch (status) {
        case AVAuthorizationStatusNotDetermined:
        {
            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {
                if(!granted) {
                    showUngrantedAlert();
                }
            }];
            break;
        }
        case AVAuthorizationStatusDenied:
        case AVAuthorizationStatusRestricted:
        {
            showUngrantedAlert();
            break;
        }
        default: break;
    }
    DDLogInfo(@"???? %s (%ld)", __func__, status);
}

OC 定义字符串枚举

typedef NSString *AVAudioSessionMode NS_STRING_ENUM;
OS_EXPORT AVAudioSessionMode const AVAudioSessionModeDefault;
OS_EXPORT AVAudioSessionMode const AVAudioSessionModeVoiceChat

Q: How do I fix "selector not recognized" runtime exceptions when trying to use category methods from a static library?

https://developer.apple.com/library/archive/qa/qa1490/_index.html#//apple_ref/doc/uid/DTS10004097

JS字符串中嵌入变量

console.log(`this is a test inner ${variable}`);

Jekyll

https://jekyllrb.com
http://jekyllthemes.org
sudo gem install -n /usr/local/bin jekyll
搭建博客
Themes

• https://chirpy.cotes.page/
• https://demo.themefisher.com/kross/
• http://arkadianriver.github.io/spectral/

Swift hexString to UIColor

extension UIColor {
    static func hexColor(_ hexString: String, alpha: CGFloat = 1) -> UIColor? {
        var string = ""
        if hexString.lowercased().hasPrefix("0x") {
            string =  hexString.replacingOccurrences(of: "0x", with: "")
        } else if hexString.hasPrefix("#") {
            string = hexString.replacingOccurrences(of: "#", with: "")
        } else {
            string = hexString
        }

        if string.count == 3 {
            var str = ""
            string.forEach { str.append(String(repeating: String($0), count: 2)) }
            string = str
        }

        guard let hexValue = Int(string, radix: 16) else { return nil }

        let red = (hexValue >> 16) & 0xff
        let green = (hexValue >> 8) & 0xff
        let blue = hexValue & 0xff
        return .init(red: CGFloat(red)/255, green: CGFloat(green)/255, blue: CGFloat(blue)/255, alpha: 1)
    }
}

一种投机取巧快速实现自适应collection布局的方式

这种方式用到了私有API_rowAlignmentsOptionsDictionary，可能有不被过审的风险，仅供学习参考。

PS：垂直对齐好像现在还无法起作用，默认就是居中对齐的。

Left

Center

Right

class CollectionCell: UICollectionViewCell {
    @IBOutlet weak var textLb: UILabel!
}

extension String {
    func duplicated(times: Int, joined separator: String = "") -> Self {
        return (0..<times).map{ _ in self }.joined(separator: separator)
    }
}

class ViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        updateLayoutAlignment(.left)
    }
    
    @IBAction func changeAlignment(_ sender: UISegmentedControl) {
        guard let alignment = NSTextAlignment(rawValue: sender.selectedSegmentIndex) else {
            return
        }
        updateLayoutAlignment(alignment)
    }
    
    func updateLayoutAlignment(_ alignment: NSTextAlignment) {
        let layout = UICollectionViewFlowLayout()
        layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
        var options = layout.value(forKey: "_rowAlignmentsOptionsDictionary") as? [String: Int]
        options?["UIFlowLayoutCommonRowHorizontalAlignmentKey"] = alignment.rawValue
        options?["UIFlowLayoutLastRowHorizontalAlignmentKey"] = alignment.rawValue
        layout.setValue(options, forKey: "_rowAlignmentsOptionsDictionary")
        
        CATransaction.disableActions()
        CATransaction.begin()
        collectionView.collectionViewLayout = layout
        CATransaction.commit()
    }
    
    lazy var items: [String] = Array(0...10).map{
        let times = Int(1 + arc4random() % 20)
        let enter = Int(1 + arc4random() % 10)
        return String($0)
            .duplicated(times: times, joined: ",")
            .duplicated(times: enter, joined: "\n")
    }
    
    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as? CollectionCell else {
            return .init()
        }
        cell.textLb.text = items[indexPath.item]
        return cell
    }
    
    override func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    
    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return items.count
    }
}

iOS13 手动切换夜间模式

• Toggle view controller's view's key window's UserInterfaceStyle

guard 
  let currentStyle = view.window?.overrideUserInterfaceStyle 
else {
  return
}
// Or you can toggle `overrideUserInterfaceStyle` 
// for the whole app's key window:
/*
  UIApplication.shared.delegate?.window?.overrideUserInterfaceStyle = xxx
*/
let newStyle: UIUserInterfaceStyle = currentStyle == .light ? .dark : .light
view.window?.overrideUserInterfaceStyle = newStyle

// save the theme style settings to user defaults
UserDefaults.standard.setValue(newStyle.rawValue, forKey: "AppThemeStyle")
UserDefaults.standard.synchronize()

// @available(iOS 13.0, *)
// open var overrideUserInterfaceStyle: UIUserInterfaceStyle

Apply the user last saved theme settings when the app is initiated:

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow? {
        didSet{
            if let saved = UserDefaults.standard.value(forKey: "AppThemeStyle") as? Int,
               let style = UIUserInterfaceStyle(rawValue: saved) {
                window?.overrideUserInterfaceStyle = style
            }
        }
    }
}

• Only toggle some specific one view controller's UserInterfaceStyle

let currentStyle = overrideUserInterfaceStyle
overrideUserInterfaceStyle =  currentStyle == .light ? .dark : .light