问题1：ADClient编译报错问题
报错信息
Undefined symbols for architecture arm64:"_OBJC_CLASS_$_ADClient", referenced from:in ViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
相关代码（demo）
原因
苹果对AdClicent API加了一个标识
ADCLIENT_DEPRECATED_IOS_90_145_OBSOLETED_180
表示：iOS7.1-iOS14.5可用，iOS18彻底废弃，会在iOS18系统上编译失败。
解决办法
使用AdService库的AAAttribution替代，注意iOS14.3才可以使用。
代码
if (@available(ios 14.3, *)) {NSError *error;NSString *token = [AAAttribution attributionTokenWithError:&error];if (token != nil) {...}
}
参考
https://developer.apple.com/forums/thread/759156
https://developer.apple.com/documentation/iad?language=objc
问题2：Xcode16（正式版）运行时，YYCache导致crash
报错信息
原因
在 iOS18 中，需要提前对 sqlite3_stmt 执行 sqlite3_finalize。
解决办法
代码
- (BOOL)_dbClose {if (!_db) return YES;int result = 0;BOOL retry = NO;BOOL stmtFinalized = NO;if (@available(iOS 18, *)) {if (_dbStmtCache) {CFIndex size = CFDictionaryGetCount(_dbStmtCache);CFTypeRef *valuesRef = (CFTypeRef *)malloc(size * sizeof(CFTypeRef));CFDictionaryGetKeysAndValues(_dbStmtCache, NULL, (const void **)valuesRef);const sqlite3_stmt **stmts = (const sqlite3_stmt **)valuesRef;for (CFIndex i = 0; i < size; i ++) {sqlite3_stmt *stmt = stmts[i];sqlite3_finalize(stmt);}free(valuesRef);CFRelease(_dbStmtCache);}} else {if (_dbStmtCache) CFRelease(_dbStmtCache);_dbStmtCache = NULL;}do {retry = NO;result = sqlite3_close(_db);if (result == SQLITE_BUSY || result == SQLITE_LOCKED) {if (!stmtFinalized) {stmtFinalized = YES;sqlite3_stmt *stmt;while ((stmt = sqlite3_next_stmt(_db, nil)) != 0) {sqlite3_finalize(stmt);retry = YES;}}} else if (result != SQLITE_OK) {if (_errorLogsEnabled) {NSLog(@"%s line:%d sqlite close failed (%d).", __FUNCTION__, __LINE__, result);}}} while (retry);_db = NULL;return YES;
}
参考
https://giters.com/ibireme/YYCache/issues/166
问题3：Xcode16正式版，addSubView crash （maskView）
报错信息
*** Assertion failure in -[TestMaskView _addSubview:positioned:relativeTo:], UIView.m:18496
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Set `maskView` (<UIView: 0x14a21ddd0; frame = (0 0; 0 0); layer = <CALayer: 0x60000314b480>>) to `nil` before adding it as a subview of <TestMaskView: 0x153e08350; frame = (0 0; 393 852); layer = <CALayer: 0x60000314b440>>'
*** First throw call stack:
(0 CoreFoundation 0x00000001063540ec __exceptionPreprocess + 1721 libobjc.A.dylib 0x00000001048bede8 objc_exception_throw + 722 Foundation 0x0000000109d21aa8 _userInfoForFileAndLine + 03 UIKitCore 0x0000000128c0151c -[UIView(Internal) _addSubview:positioned:relativeTo:] + 11244 ADClientTest 0x0000000104609660 -[TestMaskView initWithFrame:] + 2765 ADClientTest 0x0000000104609434 -[ViewController viewDidLoad] + 1646 UIKitCore 0x0000000127f1e69c -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 807 UIKitCore 0x0000000127f23238 -[UIViewController loadViewIfRequired] + 9088 UIKitCore 0x0000000127f234e0 -[UIViewController view] + 209 UIKitCore 0x00000001286c3a08 -[UIWindow addRootViewControllerViewIfPossible] + 13210 UIKitCore 0x00000001286c343c -[UIWindow _updateLayerOrderingAndSetLayerHidden:actionBlock:] + 16811 UIKitCore 0x00000001286c4288 -[UIWindow _setHidden:forced:] + 22812 UIKitCore 0x00000001286d3344 -[UIWindow _mainQueue_makeKeyAndVisible] + 3613 UIKitCore 0x000000012892dcd8 -[UIWindowScene _performDeferredInitialWindowUpdateForConnection] + 20414 UIKitCore 0x0000000127af58f0 +[UIScene _sceneForFBSScene:create:withSession:connectionOptions:] + 116415 UIKitCore 0x000000012868f45c -[UIApplication _connectUISceneFromFBSScene:transitionContext:] + 80816 UIKitCore 0x000000012868f70c -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 30417 UIKitCore 0x000000012815ec08 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 26018 FrontBoardServices 0x0000000113090ce4 __95-[FBSScene _callOutQueue_didCreateWithTransitionContext:alternativeCreationCallout:completion:]_block_invoke + 26019 FrontBoardServices 0x00000001130910a4 -[FBSScene _callOutQueue_coalesceClientSettingsUpdates:] + 6020 FrontBoardServices 0x0000000113090b64 -[FBSScene _callOutQueue_didCreateWithTransitionContext:alternativeCreationCallout:completion:] + 40821 FrontBoardServices 0x00000001130bdd50 __93-[FBSWorkspaceScenesClient _callOutQueue_sendDidCreateForScene:transitionContext:completion:]_block_invoke.156 + 21622 FrontBoardServices 0x000000011309d618 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 16023 FrontBoardServices 0x00000001130bc220 -[FBSWorkspaceScenesClient _callOutQueue_sendDidCreateForScene:transitionContext:completion:] + 38824 libdispatch.dylib 0x000000010bdea7b8 _dispatch_client_callout + 1625 libdispatch.dylib 0x000000010bdee3bc _dispatch_block_invoke_direct + 38826 FrontBoardServices 0x00000001130e0b58 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 4427 FrontBoardServices 0x00000001130e0a34 -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible] + 19628 FrontBoardServices 0x00000001130e0b8c -[FBSMainRunLoopSerialQueue _performNextFromRunLoopSource] + 2429 CoreFoundation 0x00000001062b8324 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 2430 CoreFoundation 0x00000001062b826c __CFRunLoopDoSource0 + 17231 CoreFoundation 0x00000001062b7a2c __CFRunLoopDoSources0 + 32432 CoreFoundation 0x00000001062b20b0 __CFRunLoopRun + 78833 CoreFoundation 0x00000001062b1960 CFRunLoopRunSpecific + 53634 GraphicsServices 0x0000000117edfb10 GSEventRunModal + 16035 UIKitCore 0x000000012868db40 -[UIApplication _run] + 79636 UIKitCore 0x0000000128691d38 UIApplicationMain + 12437 ADClientTest 0x0000000104609064 main + 14038 dyld 0x00000001047cd410 start_sim + 2039 ??? 0x000000010490a274 0x0 + 4371554932
)
libc++abi: terminating due to uncaught exception of type NSException
原因
iOS 18 对 UIView的maskView 增加了断言，导致如果业务代码里有同名属性可能导致触发该断言。
经测试发现：
1.自定义UIView子视图，存在同名属性maskView，会崩溃
2.自定义cell，添加到cell视图上会崩溃，添加到contentView上，则不会崩溃
3.控制器里的maskView视图属性，添加到控制器view，不会崩溃
解决办法
修改自定义视图，将自定义子组件名为maskView的视图进行重命名。
问题4："__mh_execute_header", referenced from:
Undefined symbols for architecture arm64: "__mh_execute_header", referenced from:
报错信息
解决办法：
dladdr(&_mh_execute_header, &info); 修改为 dladdr(&_MH_EXECUTE_SYM, &info);
参考链接：https://www.jianshu.com/p/cca4d4d8145d