iOS16になってから_UIResponderForwarderWantsForwardingFromResponderでクラッシュするケースが散見されるようになりました。
一例を上げると以下のようなクラッシュログのようなものが該当します。
Thread 0 name:
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00000001c9d71574 __terminate_with_payload + 8
1 libsystem_kernel.dylib 0x00000001c9d92c34 abort_with_payload_wrapper_internal + 136 (terminate_with_reason.c:106)
2 libsystem_kernel.dylib 0x00000001c9d92c48 abort_with_payload + 16 (terminate_with_reason.c:124)
3 libsystem_c.dylib 0x000000019258ac14 _os_crash_msg + 116 (assumes.c:285)
4 UIKitCore 0x000000018d1d3850 _UIResponderForwarderWantsForwardingFromResponder + 1256 (UITouch.m:240)
5 UIKitCore 0x000000018d0ebcbc __forwardTouchMethod_block_invoke + 44 (UIResponder.m:2171)
6 CoreFoundation 0x000000018b053328 __NSSET_IS_CALLING_OUT_TO_A_BLOCK__ + 24 (NSSetHelpers.m:10)
7 CoreFoundation 0x000000018b0d28f8 -[__NSSetM enumerateObjectsWithOptions:usingBlock:] + 200 (NSSetM_Common.h:157)
8 UIKitCore 0x000000018d2b47b8 forwardTouchMethod + 236 (UIResponder.m:2170)
9 UIKitCore 0x000000018d1b0938 -[UIWindow _sendTouchesForEvent:] + 356 (UIWindow.m:3170)
10 UIKitCore 0x000000018d1aff30 -[UIWindow sendEvent:] + 3280 (UIWindow.m:3491)
11 UIKitCore 0x000000018d1af1e4 -[UIApplication sendEvent:] + 676 (UIApplication.m:12655)
12 UIKitCore 0x000000018d1ad4d0 __dispatchPreprocessedEventFromEventQueue + 1768 (UIEventDispatcher.m:2414)
13 UIKitCore 0x000000018d1f6130 __processEventQueue + 5576 (UIEventDispatcher.m:2723)
14 UIKitCore 0x000000018d4fb114 __eventFetcherSourceCallback + 160 (UIEventDispatcher.m:2795)
15 CoreFoundation 0x000000018b11c208 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1957)
16 CoreFoundation 0x000000018b128864 __CFRunLoopDoSource0 + 176 (CFRunLoop.c:2001)
17 CoreFoundation 0x000000018b0ad6c8 __CFRunLoopDoSources0 + 244 (CFRunLoop.c:2038)
18 CoreFoundation 0x000000018b0c31c4 __CFRunLoopRun + 828 (CFRunLoop.c:2953)
19 CoreFoundation 0x000000018b0c84dc CFRunLoopRunSpecific + 612 (CFRunLoop.c:3418)
20 GraphicsServices 0x00000001c633435c GSEventRunModal + 164 (GSEvent.c:2196)
21 UIKitCore 0x000000018d45437c -[UIApplication _run] + 888 (UIApplication.m:3773)
22 UIKitCore 0x000000018d453fe0 UIApplicationMain + 340 (UIApplication.m:5363)
23 MobCas 0x0000000100300180 main + 64 (AppDelegate.swift:17)
24 dyld 0x00000001aa55cdec start + 2220 (dyldMain.cpp:1165)
クラッシュの原因
サードパーティ・ソフトウェアキーボードを使用している場合に、クラッシュする場合があるという物のようです。
SnowGirls氏が再現用のレポジトリを公開しています。
対応方法
SnowGirls氏が対応方法をレポジトリ内で公開していますが、少し冗長なので整理した物で対応しました。
（xxx_にしていますが、適当なアプリケーションプレフィックスを付けて利用してください）
@interface UITouch (UIResponderForwarderPatch)
@end@implementation UITouch (UIResponderForwarderPatch)
+ (void)load {
[super load];
SEL sel = NSSelectorFromString(@"_wantsForwardingFromResponder:toNextResponder:withEvent:");
Method originalMethod = class_getInstanceMethod(self, sel);
if (originalMethod != NULL) {
method_exchangeImplementations(originalMethod,
class_getInstanceMethod(self, @selector(xxx_original_wantsForwardingFromResponder:toNextResponder:withEvent:)));
method_exchangeImplementations(class_getInstanceMethod(self, @selector(xxx_wantsForwardingFromResponder:toNextResponder:withEvent:)),
originalMethod);
}
}
- (BOOL)xxx_wantsForwardingFromResponder:(UIResponder *)arg1 toNextResponder:(UIResponder *)arg2 withEvent:(UIEvent *)arg3 {
NSString* responderClassName = NSStringFromClass([arg2 class]);
if ([responderClassName isEqualToString:@"_UIRemoteInputViewController"]) {
BOOL isDeallocating = NO;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
SEL sel = NSSelectorFromString(@"_isDeallocating");
isDeallocating = [arg2 respondsToSelector:sel] && [arg2 performSelector:sel];
#pragma clang diagnostic pop
if (isDeallocating) {
return YES;
}
}
return [self xxx_original_wantsForwardingFromResponder:arg1 toNextResponder:arg2 withEvent:arg3];
}
- (BOOL)xxx_original_wantsForwardingFromResponder:(UIResponder *)arg1 toNextResponder:(UIResponder *)arg2 withEvent:(UIEvent *)arg3 {
return NO;
}
@end
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