viewDidLoadの後でsetBackgroundColorが呼ばれている
#0 0x00000001cc026b14 in -[UIView(Rendering) setBackgroundColor:] () #1 0x000000019f62629c in -[NSObject(NSKeyValueCoding) setValue:forKey:] () #2 0x00000001cc038fcc in -[UIView(CALayerDelegate) setValue:forKey:] () #3 0x00000001cb83c71c in -[NSObject(UIIBPrivate) _uikit_applyValueFromTraitStorage:forKeyPath:] () #4 0x00000001cb83dd08 in -[_UIColorAttributeTraitStorage applyRecordsMatchingTraitCollection:] () #5 0x00000001cb83cf0c in -[NSObject(_UITraitStorageAccessors) _applyTraitStorageRecordsForTraitCollection:] () #6 0x00000001cc01095c in -[UIView _traitCollectionDidChangeInternal:] () #7 0x00000001cc010c7c in -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] () #8 0x00000001cc010f70 in -[UIView _processDidChangeRecursivelyFromOldTraits:toCurrentTraits:forceNotification:] () #9 0x00000001cc03970c in -[UIView(CALayerDelegate) layoutSublayersOfLayer:] () #10 0x00000001a3275b7c in -[CALayer layoutSublayers] () #11 0x00000001a327ab34 in CA::Layer::layout_if_needed(CA::Transaction*) () #12 0x00000001a31d9598 in CA::Context::commit_transaction(CA::Transaction*) () #13 0x00000001a3207ec8 in CA::Transaction::commit() () #14 0x00000001cbbaaf78 in __34-[UIApplication _firstCommitBlock]_block_invoke_2 () #15 0x000000019ec09f30 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ () #16 0x000000019ec09830 in __CFRunLoopDoBlocks () #17 0x000000019ec04824 in __CFRunLoopRun () #18 0x000000019ec040e0 in CFRunLoopRunSpecific () #19 0x00000001a0e7d584 in GSEventRunModal () #20 0x00000001cbb90c00 in UIApplicationMain () #21 0x0000000104169b30 in main at /Users/omochi/github/omochi/NamedColorBug/NamedColorBug/AppDelegate.swift:12