mayoff

The attached lldb command pblock command lets you peek inside an Objective-C block. It tries to tell you where to find the source code for the block, and the values captured by the block when it was created.

Consider this example program:

#import <Foundation/Foundation.h>

@interface Foo: NSObject
@end

@implementation Foo

steipete

static void PSPDFFixiOS12AccessibilityTestCrash(void) {
    let accessibilityLoaderClass = NSClassFromString(@"UIAccessibilityInformationLoader");
    let accessibilitySEL = NSSelectorFromString(@"_loadAccessibilityInformationOnMainThread:");
    __block IMP originalIMP = pspdf_swizzleSelectorWithBlock(accessibilityLoaderClass, accessibilitySEL, ^(id _self, BOOL onMainThread) {
        @try {
            ((void (*)(id, SEL, BOOL))originalIMP)(_self, accessibilitySEL, onMainThread);
        } @catch (NSException *exception) {
            NSLog(@"Exception received: %@", exception);
            if ([exception.name isEqualToString:NSInvalidArgumentException] && [exception.reason containsString:@"_accessibilityLoadAccessibilityInformation"]) {
                NSLog(@"Ignoring IOS 12b5 weirdness...");

cellularmitosis

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        let window = UIWindow(frame: UIScreen.main.bounds)

jankais3r

//Sourced from http://newosxbook.com/ent.jl?ent=&osVer=iOS13
abs-client
absinthe-client
adi-client
allow-obliterate-device
allow-softwareupdated
appData
application-identifier
aps-connection-initiate
aps-environment

keith

Usage

1. swiftc main.swift -emit-module-path main.swiftmodule -emit-executable -enable-private-imports -Xfrontend -enable-implicit-dynamic
2. ./main -> prints From original bar()
3. swiftc -emit-library inject.swift -o inject.dylib -I . -Xlinker -undefined -Xlinker suppress -Xlinker -flat_namespace -Xfrontend -disable-access-control
4. DYLD_INSERT_LIBRARIES=inject.dylib ./main -> prints From replacement bar()

Notes

• Passing -Xfrontend -enable-implicit-dynamic removes you from having to add dynamic to everything you want to be replacable

nicklockwood

extension Data {
  init?(hexString: String) {
    let count = hexString.count / 2
    var data = Data(capacity: count)
    var i = hexString.startIndex
    for _ in 0 ..< count {
      let j = hexString.index(after: i)
      if var byte = UInt8(hexString[i ... j], radix: 16) {
        data.append(&byte, count: 1)
      } else {

jverkoey

static const CGFloat kFontWeightEpsilon = FLT_EPSILON;

@implementation UIFont (CustomizedDynamicType)

+ (nonnull UIFont *)preferredFontWithDefaultSize:(CGFloat)size
                                       textStyle:(nonnull UIFontTextStyle)textStyle {
  return [self preferredFontWithDefaultSize:size
                                  textStyle:textStyle
                                 fontWeight:UIFontWeightRegular
                                     italic:NO];

bjhomer

//
//  ContentView.swift
//  SwiftUIPlayground
//
//  Created by BJ Homer on 4/26/21.
//

import SwiftUI