记录各种疑难杂症

1. Terminating app due to uncaught exception 'UIApplicationInvalidInterfaceOrientation', reason: 'Supported orientations has no common orientation with the application, and [UIAlertController shouldAutorotate] is returning YES'

由于APP只支持竖屏，而在其中某个页面中单独设置支持横屏，在此横屏页面下，如果触发了某个业务弹出了UIAlertController，则会导致崩溃。网上有说写一个UIAlertController分类，在其中重写shouldAutorotate方法处理，然而写了之后并不会执行。
当然不仅仅是UIAlertController这一种情况，UIImagePickerViewController这种系统的东西都有可能触发。
解决方案：在AppDelegate中实现以下方法根据实际业务判断处理

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    UIViewController *rootVC = window.rootViewController;
    if (rootVC.presentedViewController) {
        UIViewController *theVC = rootVC.presentedViewController;
        while (theVC.presentedViewController) {
            theVC = theVC.presentedViewController;
        }
        if ([theVC shouldAutorotate]) {
            return UIInterfaceOrientationMaskAll;
        }
        return theVC.supportedInterfaceOrientations;
    }
    return rootVC.supportedInterfaceOrientations;
}

2. iOS 16实时活动API，在iPhone上没问题，在M1上打开闪退。

闪退堆栈

* thread #26, queue = 'com.apple.root.user-initiated-qos.cooperative', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00000001a37e442c libswiftCore.dylib`swift::ResolveAsSymbolicReference::operator()(swift::Demangle::__runtime::SymbolicReferenceKind, swift::Demangle::__runtime::Directness, int, void const*) + 176
    frame #1: 0x00000001a380ee3c libswiftCore.dylib`swift::Demangle::__runtime::Demangler::demangleSymbolicReference(unsigned char) + 228
    frame #2: 0x00000001a380b1cc libswiftCore.dylib`swift::Demangle::__runtime::Demangler::demangleType(__swift::__runtime::llvm::StringRef, std::__1::function<swift::Demangle::__runtime::Node* (swift::Demangle::__runtime::SymbolicReferenceKind, swift::Demangle::__runtime::Directness, int, void const*)>) + 264
    frame #3: 0x00000001a37ec3e4 libswiftCore.dylib`swift_getTypeByMangledNameImpl(swift::MetadataRequest, __swift::__runtime::llvm::StringRef, void const* const*, std::__1::function<swift::TargetMetadata<swift::InProcess> const* (unsigned int, unsigned int)>, std::__1::function<swift::TargetWitnessTable<swift::InProcess> const* (swift::TargetMetadata<swift::InProcess> const*, unsigned int)>) + 504
    frame #4: 0x00000001a37e7a3c libswiftCore.dylib`swift_getTypeByMangledName + 832
    frame #5: 0x00000001a37e7d4c libswiftCore.dylib`swift_getTypeByMangledNameInContext + 164
    frame #6: 0x0000000103d2b1c4 XXXX`__swift_instantiateConcreteTypeFromMangledName at <compiler-generated>:0
    frame #7: 0x0000000103d2b408 XXXX`partial apply for closure #1 in static Bridge.stop(_:) at <compiler-generated>:0
    frame #8: 0x0000000103d2b784 XXXX`thunk for @escaping @callee_guaranteed @Sendable @async () -> (@out A) at <compiler-generated>:0
    frame #9: 0x0000000103d2c1ac XXXX`partial apply for thunk for @escaping @callee_guaranteed @Sendable @async () -> (@out A) at <compiler-generated>:0

定位代码

Activity<WidgetAttributes>.activities

只要写了这个API，即便是不做其他事情，也会闪退，最终只能判断在iPad上不调用。
一开始无法定位，bugly上只有__swift_instantiateConcreteTypeFromMangledName，通过这个搜索到的都是说OC与Swift类型转换的问题，完全误导了排查方向。

3. dyld[41865]: Symbol not found: OBJC_CLASS$_Reachability

OC项目中使用到了Swift库，此库依赖了ReachabilitySwift库。同时之前也存在了Reachability的OC版本库，编译时是两个名字的库未发生问题，运行时由于有相同类名导致找不到对应路径。只需要删除其中一个库便可。

4. DYLD, Library not loaded

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Termination Description: DYLD, Library not loaded: /System/Library/Frameworks/SwiftUI.framework/SwiftUI | Referenced from: /var/containers/Bundle/Application/D24B9375-7B33-4578-A87F-69A052688796/XXX.app/XXX | Reason: image not found
Triggered by Thread:  0

这个问题发生的场景是Xcode 15打包，在iOS 13(不含)之前系统无法启动APP。由于提示原因是SwiftUI.framework找不到，而且项目确实引用了这个库，就针对引用的项目都做了适配。奇怪的是后来没有引用这个库的APP也无法打开，为了研究这个原因，新建项目测试，最终发现OC主项目中只要包含了一个Swift文件，那么编译的包就会包含一堆Swift库。

    /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony (compatibility version 1.0.0, current version 0.0.0)
    /System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 2202.0.0)
    /System/Library/Frameworks/UIKit.framework/UIKit (compatibility version 1.0.0, current version 7209.1.102)
    @rpath/YBKit.framework/YBKit (compatibility version 1.0.0, current version 1.0.0)
    /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1336.62.1)
    /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation (compatibility version 150.0.0, current version 2202.0.0)
    /System/Library/Frameworks/SwiftUI.framework/SwiftUI (compatibility version 1.0.0, current version 5.2.12)
    /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 1600.157.0)
    /usr/lib/swift/libswiftCore.dylib (compatibility version 1.0.0, current version 5.9.2)
    /usr/lib/swift/libswiftCoreFoundation.dylib (compatibility version 1.0.0, current version 120.100.0, weak)
    /usr/lib/swift/libswiftCoreImage.dylib (compatibility version 1.0.0, current version 2.0.0, weak)
    /usr/lib/swift/libswiftDarwin.dylib (compatibility version 1.0.0, current version 0.0.0, weak)
    /usr/lib/swift/libswiftDataDetection.dylib (compatibility version 1.0.0, current version 757.6.0, weak)
    /usr/lib/swift/libswiftDispatch.dylib (compatibility version 1.0.0, current version 34.0.2, weak)
    /usr/lib/swift/libswiftFileProvider.dylib (compatibility version 1.0.0, current version 1703.62.4, weak)
    /usr/lib/swift/libswiftMetal.dylib (compatibility version 1.0.0, current version 341.35.0, weak)
    /usr/lib/swift/libswiftOSLog.dylib (compatibility version 1.0.0, current version 4.0.0, weak)
    /usr/lib/swift/libswiftObjectiveC.dylib (compatibility version 1.0.0, current version 8.0.0)
    /usr/lib/swift/libswiftQuartzCore.dylib (compatibility version 1.0.0, current version 3.0.0, weak)
    /usr/lib/swift/libswiftUniformTypeIdentifiers.dylib (compatibility version 1.0.0, current version 794.2.2, weak)
    /usr/lib/swift/libswiftos.dylib (compatibility version 1.0.0, current version 1040.0.0, weak)
    /usr/lib/swift/libswiftFoundation.dylib (compatibility version 1.0.0, current version 1.0.0, weak)
    /usr/lib/swift/libswiftUIKit.dylib (compatibility version 1.0.0, current version 1.0.0, weak)
    /usr/lib/swift/libswiftCoreGraphics.dylib (compatibility version 1.0.0, current version 120.100.0, weak)

解决方法有两种：

1. Other Linker Flags下面添加两行
-weak_framework
"SwiftUI"

2. Link Binary With Libraries 中添加对应的 framework
在 Status 中选择为 Optional

个人倾向于第一种方案，因为第二种方案项目中确实没有使用这个库。

5. OC与Swift混编闪退情况

① Swift.*._unconditionallyBridgeFromObjectiveC

* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00000001e5236198 libsystem_kernel.dylib`__pthread_kill + 8
    frame #1: 0x00000001f47c15f8 libsystem_pthread.dylib`pthread_kill + 208
    frame #2: 0x00000001b08804b8 libsystem_c.dylib`abort + 124
    frame #3: 0x00000001a3bd8998 libswiftCore.dylib`swift::fatalErrorv(unsigned int, char const*, char*) + 132
    frame #4: 0x00000001a3bd89b4 libswiftCore.dylib`swift::fatalError(unsigned int, char const*, ...) + 28
    frame #5: 0x00000001a3bd06ec libswiftCore.dylib`swift::swift_dynamicCastFailure(void const*, char const*, void const*, char const*, char const*) + 76
    frame #6: 0x00000001a3bd0764 libswiftCore.dylib`swift::swift_dynamicCastFailure(swift::TargetMetadata<swift::InProcess> const*, swift::TargetMetadata<swift::InProcess> const*, char const*) + 120
    frame #7: 0x00000001a3bd46ac libswiftCore.dylib`swift_dynamicCast + 280
    frame #8: 0x00000001a3f56b18 Foundation`generic partial specialization <Signature = @escaping @convention(thin) <τ_0_0, τ_0_1 where τ_0_0 == Swift.AnyObject> (@guaranteed Swift.Array<Swift.AnyObject>) -> (@owned Swift.Array<τ_0_1>)> of Swift._arrayForceCast<τ_0_0, τ_0_1>(Swift.Array<τ_0_0>) -> Swift.Array<τ_0_1> + 336
    frame #9: 0x00000001a3f87d50 Foundation`static Swift.Array._unconditionallyBridgeFromObjectiveC(Swift.Optional<__C.NSArray>) -> Swift.Array<τ_0_0> + 260
    frame #10: 0x00000001002b95e0 TestBugly`@objc static Test.array(_:) at <compiler-generated>:0
  * frame #11: 0x00000001002b82a8 TestBugly`-[ViewController crash:](self=0x0000000129f0c620, _cmd="crash:", sender=0x0000000129e0f2b0) at ViewController.m:102:5

此情况是由于OC调用Swift方法传入参数为nil或集合类内部元素类型不匹配

Example:
func url(_ url: URL) {}
[Test url:nil];

func array(_ array: [String]) {}
[Test array:@[@1]];

6. UICollectionViewDiffableDataSource闪退

UITableView、UICollectionView在iOS 13有了新的布局和刷新方式，之前一直没用过，也不知道会有什么坑，从Bugly上看到了一个闪退问题多次上报，上报原因是数组越界，从代码层面分析半天也没分析出来。后来统计了上报的机型，发现都是iOS 13的系统，于是就拿出了我压箱底的6SP，一运行果然闪退了。

// 崩溃行
self.diffableDataSource?.apply(snapshot);
// 堆栈
Thread 1: "*** -[__NSArrayM objectAtIndexedSubscript:]: index 1 beyond bounds for empty array"
* thread #1, queue = 'com.apple.uikit.datasource.diffing', stop reason = hit Objective-C exception
    frame #0: 0x00000001a9f12b94 libobjc.A.dylib`objc_exception_throw
    frame #1: 0x00000001aa246280 CoreFoundation`_CFThrowFormattedException + 112
    frame #2: 0x00000001aa0db72c CoreFoundation`-[__NSArrayM objectAtIndexedSubscript:] + 180
    frame #3: 0x00000001ada70bc0 UIKitCore`-[_UICollectionCompositionalLayoutSolver _computeInitialSupplementaryKeysSectionDictForUpdate:] + 676
    frame #4: 0x00000001ada674ac UIKitCore`-[_UICollectionCompositionalLayoutSolver resolveSolutionForUpdate:] + 212
    frame #5: 0x00000001ada5fea4 UIKitCore`-[UICollectionViewCompositionalLayout _updateResolve] + 260
    frame #6: 0x00000001ada5e2d4 UIKitCore`-[UICollectionViewCompositionalLayout invalidateLayoutWithContext:] + 604
    frame #7: 0x00000001adb2a8d4 UIKitCore`-[UICollectionViewLayout _invalidateLayoutUsingContext:] + 60
    frame #8: 0x00000001adaf6a24 UIKitCore`-[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:] + 10304
    frame #9: 0x00000001adafedb8 UIKitCore`-[UICollectionView _endUpdatesWithInvalidationContext:tentativelyForReordering:animator:] + 92
    frame #10: 0x00000001adaff104 UIKitCore`-[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:animator:] + 408
    frame #11: 0x00000001adafef4c UIKitCore`-[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:] + 96
    frame #12: 0x00000001adafeed0 UIKitCore`-[UICollectionView _performBatchUpdates:completion:invalidationContext:] + 84
    frame #13: 0x00000001adafee0c UIKitCore`-[UICollectionView performBatchUpdates:completion:] + 64
    frame #14: 0x00000001adb0cb84 UIKitCore`-[UICollectionView _performDiffableUpdate:] + 48
    frame #15: 0x00000001adab501c UIKitCore`-[_UIDiffableDataSourceViewUpdater _performUpdateWithCollectionViewUpdateItems:dataSourceSnapshotter:updateHandler:completion:] + 448
    frame #16: 0x00000001adaae5b0 UIKitCore`-[__UIDiffableDataSource _commitNewDataSource:withViewUpdates:completion:] + 288
    frame #17: 0x00000001adaa9640 UIKitCore`__66-[__UIDiffableDataSource applyDifferencesFromSnapshot:completion:]_block_invoke.154 + 176
    frame #18: 0x00000001adaa98e4 UIKitCore`__66-[__UIDiffableDataSource applyDifferencesFromSnapshot:completion:]_block_invoke.180 + 124
    frame #19: 0x0000000107887730 libdispatch.dylib`_dispatch_client_callout + 16
    frame #20: 0x0000000107896488 libdispatch.dylib`_dispatch_lane_barrier_sync_invoke_and_complete + 124
    frame #21: 0x00000001adaa913c UIKitCore`-[__UIDiffableDataSource applyDifferencesFromSnapshot:completion:] + 896
    frame #22: 0x00000001adaaa194 UIKitCore`-[__UIDiffableDataSource applyDifferencesFromSnapshot:animatingDifferences:completion:] + 84
    frame #23: 0x00000001e04072f4 libswiftUIKit.dylib`merged UIKit.UICollectionViewDiffableDataSource.apply(_: UIKit.NSDiffableDataSourceSnapshot<τ_0_0, τ_0_1>, animatingDifferences: Swift.Bool, completion: Swift.Optional<() -> ()>) -> () + 216
  

按照给出的数组越界去查找原因，实在是没找出问题。然后发现有些页面调用此API没有闪退，对比发现是因为animatingDifferences属性设置为了false，鉴于此，就加上这个试一下，哦吼，闪退解决了嘿。
如果修改每个调用地方的话太麻烦了，直接使用扩展解决

extension UICollectionViewDiffableDataSource {
    func apply(_ snapshot: NSDiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>, animatingDifferences: Bool = true) {
        var animate = animatingDifferences;
        if #available(iOS 14.0, *) {}
        else {
            animate = false;
        }
        self.apply(snapshot, animatingDifferences: animate, completion: nil)
    }
}