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ࠇຐज़✡
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ࠇຐज़✡
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PCKD@HFU"TTPDJBUFE0CKFDU
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࣮ͷܗ
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PCKD@TFU"TTPDJBUFE0CKFDU
WPJEPCKD@TFU"TTPDJBUFE0CKFDU JEPCKFDU
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PCKD@"TTPDJBUJPO1PMJDZQPMJDZ
Sets an associated value for a given object using a
given key and association policy.
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PCKD@TFU"TTPDJBUFE0CKFDU
WPJEPCKD@TFU"TTPDJBUFE0CKFDU JEPCKFDU
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PCKD@"TTPDJBUJPO1PMJDZQPMJDZ
Sets an associated value for a given object using a
given key and association policy.
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PCKD@TFU"TTPDJBUFE0CKFDU
WPJEPCKD@TFU"TTPDJBUFE0CKFDU JEPCKFDU
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PCKD@"TTPDJBUJPO1PMJDZQPMJDZ
Sets an associated value for a given object using a
given key and association policy.
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PCKD@HFU"TTPDJBUFE0CKFDU
id objc_getAssociatedObject(id object, const
void *key);
Returns the value associated with a given object for a
given key.
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PCKD@HFU"TTPDJBUFE0CKFDU
id objc_getAssociatedObject(id object, const
void *key);
Returns the value associated with a given object for a
given key.
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࣮ͷܗ
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$POW
extension UICollectionView {
var mainConv: Conv? {
set {
dataSource = newValue
delegate = newValue
newValue?.collectionView = self
objc_setAssociatedObject(
self,
&UICollectionViewAssociatedObjectHandle.oldConvKey,
newValue,
.OBJC_ASSOCIATION_RETAIN_NONATOMIC
)
}
get {
return objc_getAssociatedObject(
self,
&UICollectionViewAssociatedObjectHandle.oldConvKey
) as? Conv
}
}
}
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.FUIPE4XJ[[MJOH
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.FUIPE4XJ[[MJOH
- طʹఆٛ͞Ε͍ͯΔϝιουͷ࣮ΛೖΕସ͑Δ
- Swizzle Stick Ͱ͔͖ࠞͥΔΒ͍͠ͷͰɺ୯ޠͷΠϝʔδͱ͠
ͯͦΜͳײ͡
- https://eow.alc.co.jp/search?q=swizzle
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.FUIPE4XJ[[MJOH
- ϝιουͷऔಘ
- class_getInstanceMethod
- class_getClassMethod
- ೖΕସ͑Δ
- method_exchangeImplementations
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ϝιουͷએݴ
- (void)viewDidLoad {
NSLog(@“viewDidLoad”)
}
- (void)_viewDidLoad {
NSLog(@“_viewDidLoad”)
}
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.FUIPE4XJ[[MJOHͷॲཧ
Method originalMethod = class_getInstanceMethod([self class],
@selector(viewDidLoad));
Method exchangeMethod = class_getInstanceMethod([self class],
@selector(_viewDidLoad));
method_exchangeImplementations(originalMethod, exchangeMethod);
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.FUIPE4XJ[[MJOHͷॲཧ
Method originalMethod = class_getInstanceMethod([self class],
@selector(viewDidLoad));
Method exchangeMethod = class_getInstanceMethod([self class],
@selector(_viewDidLoad));
method_exchangeImplementations(originalMethod, exchangeMethod);
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ݺΜͰΈΔ
ViewController *viewController = [ViewController new];
[viewController viewDidLoad];
ྑ͍ࢠϚωͪ͠Όμϝͩͧ
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ݺΜͰΈΔ
ViewController *viewController = [ViewController new];
[viewController viewDidLoad];
@WJFX%JE-PBE
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ϝιουͷએݴ
- (void)viewDidLoad {
NSLog(@“viewDidLoad”)
}
- (void)_viewDidLoad {
NSLog(@“_viewDidLoad”)
}
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&YBNQMF
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&YBNQMF
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&YBNQMF
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc]
initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil
action:nil]
self.navigationItem.backBarButtonItem = backButtonItem;
}
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&YBNQMF
+ (void)load {
@autoreleasepool {
Method originalMethod = class_getInstanceMethod([self class],
@selector(viewDidLoad));
Method exchangeMethod = class_getInstanceMethod([self class],
@selector(_viewDidLoad));
method_exchangeImplementations(originalMethod,
exchangeMethod);
}
}
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&YBNQMF
+ (void)load {
@autoreleasepool {
Method originalMethod = class_getInstanceMethod([self class],
@selector(viewDidLoad));
Method exchangeMethod = class_getInstanceMethod([self class],
@selector(_viewDidLoad));
method_exchangeImplementations(originalMethod,
exchangeMethod);
}
}
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͖ͬ͞ͷ
.FUIPE4XJ[[MJOHͷॲཧ
Method originalMethod = class_getInstanceMethod([self class],
@selector(viewDidLoad));
Method exchangeMethod = class_getInstanceMethod([self class],
@selector(exchangedViewDidLoad));
method_exchangeImplementations(originalMethod, exchangeMethod);
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&YBNQMF
- (void)_viewDidLoad {
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc]
initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil
action:nil];
self.navigationItem.backBarButtonItem = backButtonItem;
[self _viewDidLoad];
}
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&YBNQMF
- (void)_viewDidLoad {
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc]
initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil
action:nil];
self.navigationItem.backBarButtonItem = backButtonItem;
[self _viewDidLoad];
}
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&YBNQMF
- (void)_viewDidLoad {
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc]
initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil
action:nil];
self.navigationItem.backBarButtonItem = backButtonItem;
[self _viewDidLoad];
}
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˞ҙ
- (void)viewDidLoad {
[super viewDidLoad];
…
}
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4FHVF"EEJUJPO
public extension UIViewController {
fileprivate func swizzling() {
let prepareForSegue = class_getInstanceMethod(type(of: self),
#selector(UIViewController.prepare))
let _prepare = class_getInstanceMethod(type(of: self),
#selector(UIViewController._prepare(segue:sender:)))
method_exchangeImplementations(prepareForSegue!, _prepare!)
}
public func performSegue(_ withIdentifier: String, closure:
((UIStoryboardSegue) -> Void)? = nil) {
swizzling()
self.performSegue(withIdentifier: withIdentifier, sender:
SegueEventHolder(segueClosure: closure))
swizzling()
}
}
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&OVNFSBUJPO.VUBUJPO)BOEMFS
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&OVNFSBUJPO.VUBUJPO)BOEMFS
- objc_enumerationMutation
- objc_setEnumerationMutationHandler
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[email protected]
[email protected] JEPCK
Inserted by the compiler when a mutation is detected
during a foreach iteration.
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[email protected]
[email protected] JEPCK
Inserted by the compiler when a mutation is detected
during a foreach iteration.
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ྻʹมߋΛՃ͑Δͱ͜ͷؔΛׂΓࠐΜͰݺͿΑ
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[email protected]
Discussion
The compiler inserts this function when it detects that an object is
mutated during a foreach iteration. The function is called when a
mutation occurs, and the enumeration mutation handler is enacted if it
is set up (via
the objc_setEnumerationMutationHandler function). If the
handler is not set up, a fatal error occurs.
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[email protected]
Discussion
The compiler inserts this function when it detects that an object is
mutated during a foreach iteration. The function is called when a
mutation occurs, and the enumeration mutation handler is enacted if it
is set up (via
the objc_setEnumerationMutationHandler function). If the
handler is not set up, a fatal error occurs.
PCKD@TFU&OVNFSBUJPO.VUBUJPO)BOEMFS
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GBUBMFSSPSΛىͥ͜͢
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'BUBM&SSPSͷݕূ
NSMutableArray *array = @[@1, @2, @3].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
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'BUBM&SSPSͷݕূ
NSMutableArray *array = @[@1, @2, @3].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
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'BUBM&SSPSͷݕূ
2018-08-31 00:20:49.538515+0900 iOSDC-BlackMagick[65259:1688283] *** Terminating app due to uncaught exception 'NSGenericException', reason: '***
Collection <__NSArrayM: 0x6000000523f0> was mutated while being enumerated.'
*** First throw call stack:
(
0 CoreFoundation 0x000000011085c1e6 __exceptionPreprocess + 294
1 libobjc.A.dylib 0x000000010fef1031 objc_exception_throw + 48
2 CoreFoundation 0x00000001108d004c __NSFastEnumerationMutationHandler + 124
3 iOSDC-BlackMagick 0x000000010f5ea20c -[ViewController enumerationMutation] + 556
4 iOSDC-BlackMagick 0x000000010f5e9a69 -[ViewController viewDidLoad] + 393
5 UIKit 0x0000000110e7d131 -[UIViewController loadViewIfRequired] + 1215
6 UIKit 0x0000000110ec420c -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 6
7 UIKit 0x0000000110ec44ea -[UINavigationController _startTransition:fromViewController:toViewController:] +
136
8 UIKit 0x0000000110ec561e -[UINavigationController _startDeferredTransitionIfNeeded:] + 870
9 UIKit 0x0000000110ec686c -[UINavigationController __viewWillLayoutSubviews] + 150
10 UIKit 0x000000011111ed0b -[UILayoutContainerView layoutSubviews] + 231
11 UIKit 0x000000012d7e361c -[UILayoutContainerViewAccessibility layoutSubviews] + 42
12 UIKit 0x0000000110da87a8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1515
13 QuartzCore 0x0000000116847456 -[CALayer layoutSublayers] + 177
14 QuartzCore 0x000000011684b667 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 395
15 QuartzCore 0x00000001167d20fb _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 343
16 QuartzCore 0x00000001167ff79c _ZN2CA11Transaction6commitEv + 568
17 UIKit 0x0000000110cf3269 __34-[UIApplication _firstCommitBlock]_block_invoke_2 + 141
18 CoreFoundation 0x00000001107feb0c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
19 CoreFoundation 0x00000001107e32db __CFRunLoopDoBlocks + 331
20 CoreFoundation 0x00000001107e2a84 __CFRunLoopRun + 1284
21 CoreFoundation 0x00000001107e230b CFRunLoopRunSpecific + 635
22 GraphicsServices 0x00000001159d0a73 GSEventRunModal + 62
23 UIKit 0x0000000110cd9057 UIApplicationMain + 159
24 iOSDC-BlackMagick 0x000000010f5eab0f main + 111
25 libdyld.dylib 0x00000001142b9955 start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
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'BUBM&SSPSͷݕূ
2018-08-31 00:20:49.538515+0900 iOSDC-BlackMagick[65259:1688283] *** Terminating app due to uncaught exception 'NSGenericException', reason: '***
Collection <__NSArrayM: 0x6000000523f0> was mutated while being enumerated.'
*** First throw call stack:
(
0 CoreFoundation 0x000000011085c1e6 __exceptionPreprocess + 294
1 libobjc.A.dylib 0x000000010fef1031 objc_exception_throw + 48
2 CoreFoundation 0x00000001108d004c __NSFastEnumerationMutationHandler + 124
3 iOSDC-BlackMagick 0x000000010f5ea20c -[ViewController enumerationMutation] + 556
4 iOSDC-BlackMagick 0x000000010f5e9a69 -[ViewController viewDidLoad] + 393
5 UIKit 0x0000000110e7d131 -[UIViewController loadViewIfRequired] + 1215
6 UIKit 0x0000000110ec420c -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 6
7 UIKit 0x0000000110ec44ea -[UINavigationController _startTransition:fromViewController:toViewController:] +
136
8 UIKit 0x0000000110ec561e -[UINavigationController _startDeferredTransitionIfNeeded:] + 870
9 UIKit 0x0000000110ec686c -[UINavigationController __viewWillLayoutSubviews] + 150
10 UIKit 0x000000011111ed0b -[UILayoutContainerView layoutSubviews] + 231
11 UIKit 0x000000012d7e361c -[UILayoutContainerViewAccessibility layoutSubviews] + 42
12 UIKit 0x0000000110da87a8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1515
13 QuartzCore 0x0000000116847456 -[CALayer layoutSublayers] + 177
14 QuartzCore 0x000000011684b667 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 395
15 QuartzCore 0x00000001167d20fb _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 343
16 QuartzCore 0x00000001167ff79c _ZN2CA11Transaction6commitEv + 568
17 UIKit 0x0000000110cf3269 __34-[UIApplication _firstCommitBlock]_block_invoke_2 + 141
18 CoreFoundation 0x00000001107feb0c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
19 CoreFoundation 0x00000001107e32db __CFRunLoopDoBlocks + 331
20 CoreFoundation 0x00000001107e2a84 __CFRunLoopRun + 1284
21 CoreFoundation 0x00000001107e230b CFRunLoopRunSpecific + 635
22 GraphicsServices 0x00000001159d0a73 GSEventRunModal + 62
23 UIKit 0x0000000110cd9057 UIApplicationMain + 159
24 iOSDC-BlackMagick 0x000000010f5eab0f main + 111
25 libdyld.dylib 0x00000001142b9955 start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
5FSNJOBUJOHBQQEVFUPVODBVHIUFYDFQUJPO/4(FOFSJD&YDFQUJPO
SFBTPO
$PMMFDUJPO@@/4"SSBZ.YGXBTNVUBUFEXIJMF
CFJOHFOVNFSBUFE
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[email protected]
Discussion
The compiler inserts this function when it detects that an object is
mutated during a foreach iteration. The function is called when a
mutation occurs, and the enumeration mutation handler is enacted if it
is set up (via
the objc_setEnumerationMutationHandler function). If the
handler is not set up, a fatal error occurs.
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PCKD@TFU&OVNFSBUJPO.VUBUJPO)BOEMFS
WPJEPCKD@TFU&OVNFSBUJPO.VUBUJPO)BOEMFS WPJE IBOEMFS
JE
Sets the current mutation handler.
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IUUQTEFWFMPQFSBQQMFDPNEPDVNFOUBUJPOPCKFDUJWFDPCKD@TFUFOVNFSBUJPONVUBUJPOIBOEM
MBOHVBHFPCKD
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PCKD@TFU&OVNFSBUJPO.VUBUJPO)BOEMFS
WPJEPCKD@TFU&OVNFSBUJPO.VUBUJPO)BOEMFS WPJE IBOEMFS
JE
Sets the current mutation handler.
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MBOHVBHFPCKD
ҙ༁มߋ͞Εͨ࣌ͷॲཧΛTFU͢Δͥ
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@"array: %@", array);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2, @3].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
}
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@"array: %@", array);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
}
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@"array: %@", array);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
}
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ϩά
array: (
2,
3
)
array: (
3
)
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@“͓ئ͍ࢮͳͳ͍Ͱʂ”);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
objc_setEnumerationMutationHandler(nil);
}
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@“͓ئ͍ࢮͳͳ͍Ͱʂ”);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
objc_setEnumerationMutationHandler(nil);
}
ศར
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@“͓ئ͍ࢮͳͳ͍Ͱʂ”);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
objc_setEnumerationMutationHandler(nil);
}
ӕͰ͢
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ͬͯΈͨ
void function(NSMutableArray *array) {
NSLog(@“͓ئ͍ࢮͳͳ͍Ͱʂ”);
}
- (void)enumerationMutation {
objc_setEnumerationMutationHandler(function);
NSMutableArray *array = @[@1, @2].mutableCopy;
for (NSNumber *number in array) {
[array removeObject:number];
}
objc_setEnumerationMutationHandler(nil);
}
ࢧ໓྾ͳࢥߟɾൃݴ
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࠷ޙʹ
You typically don't need to use the Objective-C
runtime library directly when programming in
Objective-C. This API is useful primarily for
developing bridge layers between Objective-C and
other languages, or for low-level debugging.
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࠷ޙʹ
You typically don't need to use the Objective-C
runtime library directly when programming in
Objective-C. This API is useful primarily for
developing bridge layers between Objective-C and
other languages, or for low-level debugging.
ීஈͷ։ൃͰ͋Ε3VOUJNF"1*͏ඞཁ͕ͳ͍
ଞͷݴޠͷϒϦοδϯάϨΠϠʔͷσόοάʹͱͯ
ཱͭΑ
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࠷ޙʹ
You typically don't need to use the Objective-C
runtime library directly when programming in
Objective-C. This API is useful primarily for
developing bridge layers between Objective-C and
other languages, or for low-level debugging.
ීஈͷ։ൃͰ͋Ε3VOUJNF"1*͏ඞཁ͕ͳ͍
ଞͷݴޠͷϒϦοδϯάϨΠϠʔͷσόοάʹͱͯ
ཱͭΑ
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·ͱΊ
- ϓϩύςΟΛੜͤΔ
- ϝιουΛೖΕସ͑ΒΕΔ
- ͓ئ͍ࢮͳͳ͍Ͱʂ͕දݱͰ͖Δ
- ελʔ͍ͩ͘͞
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͓͠·͍a ?P?