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比如例子中的test2，把STOptionInstead改为before或者after，打印还是原方法的值

怎么编译libffi的库，可以提供一下指南吗，谢谢

crash 栈

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
    frame #0: 0x00007fff513f778b libobjc.A.dylib`objc_msgSend + 11
    frame #1: 0x00007fff2572290d Foundation`_NSSetLongLongValueAndNotify + 81
    frame #2: 0x00000001013ca58d Stinger_Example`ffi_call_unix64 + 85
  * frame #3: 0x00000001013c7804 Stinger_Example`ffi_call_int(cif=<unavailable>, fn=<unavailable>, rvalue=<unavailable>, avalue=<unavailable>, closure=<unavailable>) at ffi64_x86_64.c:660:3 [opt]
    frame #4: 0x00000001013bb956 Stinger_Example`_st_ffi_function(cif=0x00006000002b82a8, ret=0x00007ffeee853920, args=0x00007ffeee8537b0, userdata=0x00006000002b82a0) at STHookInfoPool.m:338:7
    frame #5: 0x00000001013c7a7d Stinger_Example`ffi_closure_unix64_inner(cif=0x00006000002b82a8, fun=(Stinger_Example`_st_ffi_function at STHookInfoPool.m:292), user_data=0x00006000002b82a0, rvalue=0x00007ffeee853920, reg_args=<unavailable>, argp=<unavailable>) at ffi64_x86_64.c:810:3 [opt]
    frame #6: 0x00000001013ca732 Stinger_Example`ffi_closure_unix64 + 72
    frame #7: 0x00000001013acdf2 Stinger_Example`-[ASViewController test:](self=0x00007fdcd1104c70, _cmd="test:", sender=0x00007fdccef023d0) at ASViewController.m:80:10
    frame #8: 0x00007fff48093fff UIKitCore`-[UIApplication sendAction:to:from:forEvent:] + 83
    frame #9: 0x00007fff47a6c00e UIKitCore`-[UIControl sendAction:to:forEvent:] + 223
    frame #10: 0x00007fff47a6c358 UIKitCore`-[UIControl _sendActionsForEvents:withEvent:] + 398
    frame #11: 0x00007fff47a6b2b7 UIKitCore`-[UIControl touchesEnded:withEvent:] + 481
    frame #12: 0x00007fff480cebbf UIKitCore`-[UIWindow _sendTouchesForEvent:] + 2604
    frame #13: 0x00007fff480d04c6 UIKitCore`-[UIWindow sendEvent:] + 4596
    frame #14: 0x00007fff480ab53b UIKitCore`-[UIApplication sendEvent:] + 356
    frame #15: 0x00007fff4812c71a UIKitCore`__dispatchPreprocessedEventFromEventQueue + 6847
    frame #16: 0x00007fff4812f1e0 UIKitCore`__handleEventQueueInternal + 5980
    frame #17: 0x00007fff23bd4471 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    frame #18: 0x00007fff23bd439c CoreFoundation`__CFRunLoopDoSource0 + 76
    frame #19: 0x00007fff23bd3b74 CoreFoundation`__CFRunLoopDoSources0 + 180
    frame #20: 0x00007fff23bce87f CoreFoundation`__CFRunLoopRun + 1263
    frame #21: 0x00007fff23bce066 CoreFoundation`CFRunLoopRunSpecific + 438
    frame #22: 0x00007fff384c0bb0 GraphicsServices`GSEventRunModal + 65
    frame #23: 0x00007fff48092d4d UIKitCore`UIApplicationMain + 1621
    frame #24: 0x00000001013acfa2 Stinger_Example`main(argc=1, argv=0x00007ffeee855cf0) at main.m:15:16
    frame #25: 0x00007fff5227ec25 libdyld.dylib`start + 1

测试代码：

//
//  ASViewController.m
//  Stinger
//
//  Created by Assuner on 12/05/2017.
//  Copyright (c) 2017 Assuner. All rights reserved.
//

#import "ASViewController.h"
#import <Stinger/Stinger.h>
#import <Aspects/Aspects.h>

@interface ASViewController ()

- (IBAction)test:(id)sender;
@property (nonatomic) NSInteger index;

@property (nonatomic) BOOL didAddKVO;
@property (nonatomic) BOOL didHook;

@end

@implementation ASViewController

- (void)methodA {
  
}

- (void)setFrame:(CGRect)rect {
  
}

- (void)viewDidLoad {
  [super viewDidLoad];
  [self.class st_hookInstanceMethod:@selector(methodA) option:STOptionBefore usingIdentifier:@"hook methodA before" withBlock:^(id<StingerParams> params) {

  }];
  [self.class st_hookInstanceMethod:@selector(methodA) option:STOptionAfter usingIdentifier:@"hook methodA after" withBlock:^(id<StingerParams> params) {

  }];
  
//  [self.class aspect_hookSelector:@selector(methodA) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> params) {
//
//  } error:nil];
//
//  [self.class aspect_hookSelector:@selector(methodA) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> params) {
//
//  } error:nil];
}

- (void)addKVO {
    if (_didAddKVO) {
        return;
    }
    [self addObserver:self forKeyPath:@"index" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:nil];
    _didAddKVO = YES;
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
    NSLog(@"KVO: %@", change);
}

- (void)hook_set_index {
    if (_didHook) {
        return;
    }
    [self st_hookInstanceMethod:@selector(setIndex:) option:STOptionBefore usingIdentifier:@"setIndex" withBlock:^(id<StingerParams> params, NSInteger index) {
        NSLog(@"HOOK: %@", @(index));
    }];
    _didHook = YES;
}

- (IBAction)test:(id)sender {
//  for (NSInteger i = 0; i < 1000000; i++) {
//    [self methodA];
//  }
  NSLog(@"clicked!!");
    [self addKVO];
    [self hook_set_index];
    self.index += 1;
}
@end

Stinger 目前是直接用的静态库 libffi.a，请问下 libffi 是什么版本的？

怎么样hook方法在方法执行之前修改参数

when I put the following code in category or homeViewController, the app will crash:
[UIFont st_hookClassMethod:@selector(systemFontOfSize:) option:(STOptionInstead) usingIdentifier:(@"myHook_fontWithSize") withBlock:^UIFont * (id params, CGFloat oldPara){
UIFont *oldRet;
[params invokeAndGetOriginalRetValue:&oldRet];
CGFloat newSize = oldRet.pointSize * 2;
return [UIFont fontWithName:oldRet.familyName size:newSize];
}];

the crash info is:
2023-06-28 18:00:33.468715+0800 ChangeFontSizeTest[1784:376274] [Assert] UINavigationBar decoded as unlocked for UINavigationController, or navigationBar delegate set up incorrectly. Inconsistent configuration may cause problems. navigationController=<UINavigationController: 0x15c01c200>, navigationBar=<UINavigationBar: 0x15bd09d50; frame = (0 59; 0 50); opaque = NO; autoresize = W; layer = <CALayer: 0x2833c74c0>> delegate=0x15c01c200

pls help!

如题

你好，看了是饿了么团队出品，我就用中文了。
项目中有较多地方使用Aspects，正在换 Stinger，遇到点问题，我有一个分类监听 UIScrollView contentSize 变化，使用 Stinger 无法正确工作，上代码：
crash at 'can't match a ffi_type of {CGSize=dd}'

`
#import "UIScrollView+ContentSizeChangedHandler.h"
#import <objc/runtime.h>
#import <Stinger/Stinger.h>

static NSString *const kID = @"UIScrollView.setContentSize.after";

@interface UIScrollView ()
@Property (nonatomic, assign) CGSize wj_contentSizeChangedHandler_oldContentSize; ///< 旧 contentSize
@EnD

@implementation UIScrollView (ContentSizeChangedHandler)

• (void)wj_setContentSizeChangedHandler:(ContentSizeChangedHandler)handler {
  void (^insideHandler)() = ^() {
  !handler ?: handler(self.contentSize);
  };

  self.wj_contentSizeChangedHandler_oldContentSize = self.contentSize;
  [self st_hookInstanceMethod:@selector(setContentSize:)
  option:STOptionAfter
  usingIdentifier:kID
  withBlock:^(id params, CGSize contentSize) {
  if (!CGSizeEqualToSize(self.contentSize, self.wj_contentSizeChangedHandler_oldContentSize)) {
  // 设置新值
  self.wj_contentSizeChangedHandler_oldContentSize = self.contentSize;
  insideHandler();
  }
  }];
  }
  `
  希望帮助解决，谢谢

NSRange参数支持有问题

Download Stinger from master bad3f7a.

Build the Demo project successfully.

Change the build configuration from debug to release and build again.

It's failed with:

This also happens on my project which is using Stinger with cocoapods.

如下面代码，
执行 [[TestClass new] foo]， clz foo after 会打印两次

@implementation TestClass

+ (void)load
{
    [self st_hookInstanceMethod:@selector(foo)
                         option:STOptionAfter
                usingIdentifier:@"clz"
                      withBlock:^(id info) {
        NSLog(@"clz foo after");
    }];
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        [self st_hookInstanceMethod:@selector(foo)
                             option:STOptionAfter
                    usingIdentifier:@"instance"
                          withBlock:^(id info) {
            NSLog(@"instance foo after");
        }];
    }
    return self;
}

- (void)foo
{
    NSLog(@"foo...");
}

@end 

define and implement

typedef void(^TestBlock)(float arg1, int arg2, id arg3);

- (void)print4:(NSString *)s block:(TestBlock)block;

- (void)print4:(NSString *)s block:(TestBlock)block { NSLog(@"---original print3: %@", s); block(1.2, 1, self); }

hook

[self st_hookInstanceMethod:@selector(print4:block:) option:STOptionAfter usingIdentifier:@"hook_print4_after4" withBlock:^(id<StingerParams> params, NSString *s) { NSLog(@"---after4 print4:block: %@", s); }];

crash

*** Assertion failure in BOOL isMatched(STMethodSignature *__strong, STMethodSignature *__strong, STOption, __unsafe_unretained Class, SEL, NSString *__strong)(), /Users/fsen/Downloads/Stinger-master/Stinger/Classes/Stinger.m:119
2018-02-26 12:17:18.498817+0800 Stinger_Example[38082:5521717] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'count of arguments isn't equal. Class: (ASViewController), SEL: (print4:block:), Identifier: (hook_print4_after4)'