sanllier

extension UIView {
    static let swizzle: Void = {
        let originalSelector = #selector(layoutSubviews)
        let swizzledSelector = #selector(swizzled_layoutSubviews)

        guard let originalMethod = class_getInstanceMethod(UIView.self, originalSelector) else { return }
        guard let swizzledMethod = class_getInstanceMethod(UIView.self, swizzledSelector) else { return }
        method_exchangeImplementations(originalMethod, swizzledMethod)
    }()

sanllier

@objc func veryUsefulMethod() {
  guard let superclass = superclass else { return }

  let objcSelector = Selector("veryUsefulMethod")
  typealias CFunction = @convention(c) (AnyObject, Selector) -> Void

  let impl = class_getMethodImplementation(superclass, objcSelector)
  let callableImpl = unsafeBitCast(impl, to: CFunction.self)

  callableImpl(self, objcSelector)

sanllier

let objcSelector = Selector("veryUsefulMethod")
typealias CFunction = @convention(c) (AnyObject, Selector) -> Void

let impl = class_getMethodImplementation(type(of: self).self, objcSelector)
let callableImpl = unsafeBitCast(impl, to: CFunction.self)

callableImpl(self, objcSelector)

sanllier

@objc func _needsDoubleUpdateConstraintsPass() -> Bool {
    return true
} 
 
override var intrinsicContentSize: CGSize {
    return attributedText?.size(forWidth: (engineBounds ?? bounds).width) ?? .zero
}

var engineBounds: CGRect? {
    let objcSelector = "_nsis_compatibleBoundsInEngine:")

sanllier

[<CustomLabel 0x7fcb8350d0d0>/UILabel _prepareForFirstIntrinsicContentSizeCalculation]
...
[<CustomLabel 0x7fcb8350d0d0>/UILabel _needsDoubleUpdateConstraintsPass] -> 1
...
[<CustomLabel 0x7fcb8350d0d0>/UILabel _prepareForSecondIntrinsicContentSizeCalculationWithLayoutEngineBounds:{{20, 20}, {25000000, 20.5}}]

sanllier

@objc func _prepareForSecondIntrinsicContentSizeCalculation(withLayoutEngineBounds bounds: CGRect) {
    print(bounds)
}

sanllier

override var intrinsicContentSize: CGSize {
    return attributedText?.size(forWidth: (fittingSize ?? bounds).width) ?? .zero
}

var fittingSize: CGRect?

sanllier

override func systemLayoutSizeFitting(
    _ targetSize: CGSize,
    withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority,
    verticalFittingPriority: UILayoutPriority) -> CGSize
{
    // Прокинуть верный размер с учетом отступов        
    (content as? ASLabel)?.fittingSize = computeContentTargetSize(for: targetSize)

    return super.systemLayoutSizeFitting(...)
}

sanllier

extension NSAttributedString {
    func size(forWidth width: CGFloat) -> CGSize {
        return boundingRect(
            with: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude),
            options: [.usesLineFragmentOrigin, .usesFontLeading],
            context: nil
        ).size
    }   
}