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category

1、category的本質(zhì)

今天我們先從category講起，那到底什么是category，我們借助clang看一下它在底層的結(jié)構(gòu)。
代碼還是上一章的代碼，添加分類(lèi)：

@protocol LRPersonDelegate <NSObject>

- (void)delegateMethod;

@end


NS_ASSUME_NONNULL_BEGIN

@interface LRPerson (LR)

- (void)instanceMethod;
+ (void)classMethod;

@end


@implementation LRPerson (LR)

- (void)instanceMethod {
    NSLog(@"category----%s",__func__);
}
+ (void)classMethod {
    NSLog(@"category----%s",__func__);
}

@end

clang命令：clang -rewrite-objc main.m -o main.cpp

打開(kāi)生成的.cpp文件，搜索LRPerson找到以下代碼

這是一個(gè)_category_t的結(jié)構(gòu)，里面有一個(gè)LRPerson的名字，還有兩個(gè)_method_list_t：一個(gè)_CATEGORY_INSTANCE_METHODS_，一個(gè)_CATEGORY_CLASS_METHODS_

搜索_category_t

struct _category_t {
    const char *name;
    struct _class_t *cls;
    const struct _method_list_t *instance_methods;
    const struct _method_list_t *class_methods;
    const struct _protocol_list_t *protocols;
    const struct _prop_list_t *properties;
};

這是一個(gè)結(jié)構(gòu)體，里面有6個(gè)變量
name ：類(lèi)名
cls：屬于哪個(gè)類(lèi)
instance_methods：實(shí)例方法
class_methods：類(lèi)方法
protocols：協(xié)議
properties：屬性

搜索_CATEGORY_INSTANCE_METHODS_

分類(lèi)中實(shí)現(xiàn)的instanceMethod保存在這里，是一個(gè)method_t結(jié)構(gòu)

struct method_t {
SEL name;
const char *types;
MethodListIMP imp;
}

搜索_CATEGORY_CLASS_METHODS_

分類(lèi)中實(shí)現(xiàn)的classMethod保存在這里，是一個(gè)method_t結(jié)構(gòu)

綜上所述，category在底層其實(shí)是一個(gè)_category_t結(jié)構(gòu)體，有6個(gè)變量。

attachToClass

上一篇文章分析完了prepareMethodLists，這里我們接著分析attachToClass。

通過(guò)斷點(diǎn)可以看到LRPerson類(lèi)走的是最下面的方法，不是元類(lèi) 傳入的參數(shù)為ATTACH_CLASS。

attachToClass

void attachToClass(Class cls, Class previously, int flags)
    {
        runtimeLock.assertLocked();
        ASSERT((flags & ATTACH_CLASS) ||
               (flags & ATTACH_METACLASS) ||
               (flags & ATTACH_CLASS_AND_METACLASS));

        auto &map = get();
        auto it = map.find(previously);

        if (it != map.end()) {
            category_list &list = it->second;
            if (flags & ATTACH_CLASS_AND_METACLASS) {
                int otherFlags = flags & ~ATTACH_CLASS_AND_METACLASS;
                attachCategories(cls, list.array(), list.count(), otherFlags | ATTACH_CLASS);
                attachCategories(cls->ISA(), list.array(), list.count(), otherFlags | ATTACH_METACLASS);
            } else {
                attachCategories(cls, list.array(), list.count(), flags);
            }
            map.erase(it);
        }
    }

我們發(fā)現(xiàn)LRPerson類(lèi)根本就沒(méi)有走if里面的方法。

那么分類(lèi)是什么時(shí)候加載的呢？

category和類(lèi)的加載一樣，懶加載分類(lèi)和非懶加載分類(lèi)有一定的區(qū)別：

1.非懶加載類(lèi) + 非懶加載分類(lèi)
load_images -> loadAllCategories() -> load_categories_nolock -> attachCategories -> prepareMethodLists -> attachLists

2.懶加載類(lèi) + 非懶加載分類(lèi)
load_images -> prepare_load_methods -> realizeClassWithoutSwift -> methodizeClass -> attachToClass -> attachCategories -> prepareMethodLists -> attachLists

3.非懶加載類(lèi) + 懶加載分類(lèi)
直接寫(xiě)入mach-O

4.懶加載類(lèi) + 懶加載分類(lèi)
直接寫(xiě)入mach-O

1.非懶加載類(lèi) + 非懶加載分類(lèi)


@interface LRPerson : NSObject

@property (nonatomic,strong) NSString *name;
@property (nonatomic,strong) NSString *icon;

- (void)sayHello;
- (void)sayHappy;
- (void)instanceMethod;
+ (void)classMethod;

@end
@implementation LRPerson

//- (void)sayHello {
//    NSLog(@"%@",_cmd);
//}
- (void)sayHappy {
    NSLog(@"%s",__func__);
}
- (void)instanceMethod {
    NSLog(@"%s",__func__);
}
+ (void)classMethod {
    NSLog(@"%s",__func__);
}


+ (void)load {
    NSLog(@"%s",__func__);
}
@end


@protocol LRPersonDelegate <NSObject>

- (void)delegateMethod;

@end


NS_ASSUME_NONNULL_BEGIN

@interface LRPerson (LR)

- (void)cateA;

@end

NS_ASSUME_NONNULL_END

@implementation LRPerson (LR)


- (void)instanceMethod {
    NSLog(@"category----%s",__func__);
}
+ (void)classMethod {
    NSLog(@"category----%s",__func__);
}
- (void)cateA{
    NSLog(@"category----%s",__func__);
}
+ (void)load {
    NSLog(@"category----%s",__func__);
}

@end

進(jìn)入methodizeClass斷點(diǎn)
打印list

此時(shí)category還沒(méi)有加載進(jìn)來(lái)。
斷點(diǎn)進(jìn)入attachToClass方法

在這里打一個(gè)斷點(diǎn)，LLDB調(diào)試

it和 map.end()相等，并不會(huì)走以下條件。
進(jìn)入attachCategories方法

在斷點(diǎn)處打印堆棧：

從堆棧可以看出是從load_images -> loadAllCategories() -> load_categories_nolock -> attachCategories 進(jìn)來(lái)的

for循環(huán)category數(shù)組開(kāi)始處理method_list_t、property_list_t、protocol_list_t。

static void
attachCategories(Class cls, const locstamped_category_t *cats_list, uint32_t cats_count,
                 int flags)
{
    if (slowpath(PrintReplacedMethods)) {
        printReplacements(cls, cats_list, cats_count);
    }
    if (slowpath(PrintConnecting)) {
        _objc_inform("CLASS: attaching %d categories to%s class '%s'%s",
                     cats_count, (flags & ATTACH_EXISTING) ? " existing" : "",
                     cls->nameForLogging(), (flags & ATTACH_METACLASS) ? " (meta)" : "");
    }

 
    constexpr uint32_t ATTACH_BUFSIZ = 64;
    method_list_t   *mlists[ATTACH_BUFSIZ];
    property_list_t *proplists[ATTACH_BUFSIZ];
    protocol_list_t *protolists[ATTACH_BUFSIZ];

    uint32_t mcount = 0;
    uint32_t propcount = 0;
    uint32_t protocount = 0;
    bool fromBundle = NO;
    bool isMeta = (flags & ATTACH_METACLASS);
    auto rwe = cls->data()->extAllocIfNeeded();//rwe 初始化


    //開(kāi)始處理category數(shù)據(jù)，為寫(xiě)到類(lèi)中做準(zhǔn)備
    for (uint32_t i = 0; i < cats_count; i++) {
        auto& entry = cats_list[i];

        method_list_t *mlist = entry.cat->methodsForMeta(isMeta);
        if (mlist) {
            if (mcount == ATTACH_BUFSIZ) {
                prepareMethodLists(cls, mlists, mcount, NO, fromBundle);
                rwe->methods.attachLists(mlists, mcount);
                mcount = 0;
            }
            //將mlist插入mlists數(shù)組的最后一位  mlists是一個(gè)二維數(shù)組，里面的元素還是method_list_t
            mlists[ATTACH_BUFSIZ - ++mcount] = mlist;
            fromBundle |= entry.hi->isBundle();
        }

        property_list_t *proplist =
            entry.cat->propertiesForMeta(isMeta, entry.hi);
        if (proplist) {
            if (propcount == ATTACH_BUFSIZ) {
                rwe->properties.attachLists(proplists, propcount);
                propcount = 0;
            }
            proplists[ATTACH_BUFSIZ - ++propcount] = proplist;
        }

        protocol_list_t *protolist = entry.cat->protocolsForMeta(isMeta);
        if (protolist) {
            if (protocount == ATTACH_BUFSIZ) {
                rwe->protocols.attachLists(protolists, protocount);
                protocount = 0;
            }
            protolists[ATTACH_BUFSIZ - ++protocount] = protolist;
        }
    }

    if (mcount > 0) {
        //排序mlists里的元素method_list_t  從插入的最后位置到數(shù)組的最后位置
        //排序的是mlists數(shù)組里的元素?cái)?shù)組
        prepareMethodLists(cls, mlists + ATTACH_BUFSIZ - mcount, mcount, NO, fromBundle);
        //attachLists把方法添加到列表里面
        rwe->methods.attachLists(mlists + ATTACH_BUFSIZ - mcount, mcount);
        if (flags & ATTACH_EXISTING) flushCaches(cls);
    }

    rwe->properties.attachLists(proplists + ATTACH_BUFSIZ - propcount, propcount);

    rwe->protocols.attachLists(protolists + ATTACH_BUFSIZ - protocount, protocount);
}

這里穿插一個(gè)小細(xì)節(jié)，對(duì)比下面兩張圖可以發(fā)現(xiàn)。編譯時(shí)，category是以類(lèi)名LRPerson命名的，運(yùn)行時(shí)category名字變成了LR，并且cls已經(jīng)跟我們的LRPerson關(guān)聯(lián)起來(lái)了。

attachLists

void attachLists(List* const * addedLists, uint32_t addedCount) {
        if (addedCount == 0) return;

        if (hasArray()) {
            //當(dāng)下面第三步 setArray()之后，再有新的list要插入就要走這個(gè)條件
            // many lists -> many lists
            uint32_t oldCount = array()->count;
            uint32_t newCount = oldCount + addedCount;
            setArray((array_t *)realloc(array(), array_t::byteSize(newCount)));
            array()->count = newCount;
            memmove(array()->lists + addedCount, array()->lists, 
                    oldCount * sizeof(array()->lists[0]));//將oldArray里面的元素移動(dòng)到后面
            memcpy(array()->lists, addedLists, 
                   addedCount * sizeof(array()->lists[0]));//將newArray里面的元素添加到數(shù)組前面
        }
        else if (!list  &&  addedCount == 1) {
            // 0 lists -> 1 list
            // 一維數(shù)組
            list = addedLists[0];
        } 
        else {
            // 1 list -> many lists
            List* oldList = list;
            uint32_t oldCount = oldList ? 1 : 0;
            uint32_t newCount = oldCount + addedCount;//求出新數(shù)組容量
            setArray((array_t *)malloc(array_t::byteSize(newCount)));//創(chuàng)建一個(gè)數(shù)組
            array()->count = newCount;
            if (oldList) array()->lists[addedCount] = oldList;//將oldList放到array()的最后一個(gè)位置
            memcpy(array()->lists, addedLists, 
                   addedCount * sizeof(array()->lists[0]));//從array()->lists的0號(hào)位置，放入addedLists，放入的大小是 addedCount * sizeof(array()->lists[0]，也就是把a(bǔ)ddedLists平移放入array()數(shù)組，從0號(hào)位置開(kāi)始
        }
    }

category加入到rwe的流程是：
1.初始化rwe，給rwe賦值ro里的原始類(lèi)數(shù)據(jù)
2.調(diào)用attachLists，創(chuàng)建一個(gè)list保存baseMethods
3.當(dāng)有一個(gè)分類(lèi)時(shí)，再次調(diào)用attachLists，走else方法。創(chuàng)建一個(gè)數(shù)組，將原來(lái)的baseMethods放到末尾，分類(lèi)里的數(shù)據(jù)放到前面。
4.再有分類(lèi)進(jìn)來(lái)時(shí)，走if方法，創(chuàng)建新數(shù)組，將老數(shù)據(jù)放到末尾，新數(shù)據(jù)放前面。
5.還有分類(lèi)的話，重復(fù)第四步。

extAllocIfNeeded

attachCategories有一個(gè)取rwe的方法extAllocIfNeeded。這里簡(jiǎn)單看一下源碼

class_rw_ext_t *
class_rw_t::extAlloc(const class_ro_t *ro, bool deepCopy)
{
    runtimeLock.assertLocked();

    auto rwe = objc::zalloc<class_rw_ext_t>();

    rwe->version = (ro->flags & RO_META) ? 7 : 0;

    method_list_t *list = ro->baseMethods();
    if (list) {
        if (deepCopy) list = list->duplicate();
        rwe->methods.attachLists(&list, 1);
    }

    property_list_t *proplist = ro->baseProperties;
    if (proplist) {
        rwe->properties.attachLists(&proplist, 1);
    }

    protocol_list_t *protolist = ro->baseProtocols;
    if (protolist) {
        rwe->protocols.attachLists(&protolist, 1);
    }

    set_ro_or_rwe(rwe, ro);
    return rwe;
}

主要流程：
1.開(kāi)辟一個(gè)空間給rwe
2.設(shè)置rwe的version
3.從ro中獲取原始類(lèi)的baseMethods、baseProperties、baseProtocols
4.設(shè)置set_ro_or_rwe

2.懶加載類(lèi) + 非懶加載分類(lèi)
在attachCategories打上斷點(diǎn)，等程序進(jìn)入斷點(diǎn)后，bt打印堆棧信息。

bt

從圖上可以看出，attachCategories是在load_images之后調(diào)用的。
搜索load_images，打上斷點(diǎn)，重新運(yùn)行程序

發(fā)現(xiàn)走入prepare_load_methods
prepare_load_methods

void prepare_load_methods(const headerType *mhdr)
{
    size_t count, i;

    runtimeLock.assertLocked();
    //獲取非懶加載的類(lèi)列表
    classref_t const *classlist = 
        _getObjc2NonlazyClassList(mhdr, &count);
    //為所有的非懶加載類(lèi)和他的父類(lèi)遞歸調(diào)用 +load方法
    for (i = 0; i < count; i++) {
        schedule_class_load(remapClass(classlist[i]));
    }
    //獲取非懶加載的分類(lèi)列表
    category_t * const *categorylist = _getObjc2NonlazyCategoryList(mhdr, &count);
    for (i = 0; i < count; i++) {
        category_t *cat = categorylist[i];
        Class cls = remapClass(cat->cls);//關(guān)聯(lián)上類(lèi)和category
        if (!cls) continue;  // category for ignored weak-linked class
        if (cls->isSwiftStable()) {
            _objc_fatal("Swift class extensions and categories on Swift "
                        "classes are not allowed to have +load methods");
        }
        realizeClassWithoutSwift(cls, nil);
        ASSERT(cls->ISA()->isRealized());
        add_category_to_loadable_list(cat);
    }
}

在prepare_load_methods中加入以下代碼，打上斷點(diǎn)

 //—— mark 2021-5-5
          const char *mangledName = cls->mangledName();
          const char *className = "LRPerson";
          if (strcmp(mangledName, className) == 0){
          printf("來(lái)了 \n");
          }
          //

跟蹤斷點(diǎn)，進(jìn)入realizeClassWithoutSwift
自realizeClassWithoutSwift之后，category后面的加載流程與第一種情況一致
進(jìn)入methodizeClass 準(zhǔn)備好要插入的數(shù)據(jù)
進(jìn)入attachToClass
進(jìn)入attachCategories 獲取method_list_t、property_list_t、protocol_list_t數(shù)據(jù)，rwe在這之前初始化
進(jìn)入prepareMethodLists 排序method_list_t
進(jìn)入attachLists 寫(xiě)入到rwe

3.非懶加載類(lèi) + 懶加載分類(lèi)
在attachCategories打上斷點(diǎn)，等程序進(jìn)入斷點(diǎn)，再bt。

然而結(jié)果出人意料，程序根本沒(méi)有進(jìn)入斷點(diǎn)。然而我們?cè)诳刂婆_(tái)，發(fā)現(xiàn)了一些信息，雖然沒(méi)有進(jìn)入attachCategories，但是他調(diào)用了我研究的其他三個(gè)方法。（這里有一些小失誤，沒(méi)有打印方法名）
我們?cè)?code>+load方法里打斷點(diǎn)，再bt。

通過(guò)堆棧我們發(fā)現(xiàn)，他并沒(méi)有走與Category相關(guān)的方法。
那category的加載是否是在read_images時(shí)候呢?

首先在read_images里doneOnce的時(shí)候，加上以下代碼讀取一下Mach-O文件里的數(shù)據(jù)，查看此時(shí)的baseMethods。

運(yùn)行程序，進(jìn)入斷點(diǎn)時(shí)，打印list：

我們意外的發(fā)現(xiàn)，baseMethods里的方法已經(jīng)有了category中重寫(xiě)的方法，而且他的總數(shù)count = 9，是我們LRPerson類(lèi)和category (LR)的總和。因此我們猜測(cè)category的加載，可能是在編譯期直接寫(xiě)入了mach-O文件。

4.懶加載類(lèi) + 懶加載分類(lèi)
同樣我們先查看mach-O文件的數(shù)據(jù)。

我們發(fā)現(xiàn)baseMethods里的方法已經(jīng)有了category中重寫(xiě)的方法。

補(bǔ)充

前面只是舉例了單個(gè)category，多個(gè)category有點(diǎn)不一樣。
我們?cè)?code>新建一個(gè)LRPerson+LRB，重寫(xiě)instanceMethod`

- (void)instanceMethod {
    NSLog(@"category----%s",__func__);
}

在attachCategories打斷點(diǎn)然后bt

1.非懶加載類(lèi) + 非懶加載分類(lèi)
read_images的時(shí)候LRB已經(jīng)寫(xiě)入了mach-O

區(qū)別在于加載第二個(gè)category。attachCategories里的打印信息為：

load_images -> loadAllCategories() -> load_categories_nolock -> attachCategories

2.懶加載類(lèi) + 非懶加載分類(lèi)
read_images的時(shí)候LRB已經(jīng)寫(xiě)入了mach-O

attachCategories里的打印信息為：

load_images -> prepare_load_methods -> realizeClassWithoutSwift -> methodizeClass -> attachToClass -> attachCategories

3.非懶加載類(lèi) + 懶加載分類(lèi)
read_images的時(shí)候，兩個(gè)分類(lèi)LR和LRB已經(jīng)寫(xiě)入了mach-O

(lldb) p *list
warning: could not find Objective-C class data in the process. This may reduce the quality of type information available.
(method_list_t) $0 = {
  entsize_list_tt<method_t, method_list_t, 3> = {
    entsizeAndFlags = 24
    count = 10
    first = {
      name = "instanceMethod"
      types = 0x0000000100000e55 "v16@0:8"
      imp = 0x0000000100000cc0 (KCObjc`-[LRPerson(LR) instanceMethod])
    }
  }
}
(lldb) p $0.get(0)
(method_t) $1 = {
  name = "instanceMethod"
  types = 0x0000000100000e55 "v16@0:8"
  imp = 0x0000000100000cc0 (KCObjc`-[LRPerson(LR) instanceMethod])
}
(lldb) p $0.get(1)
(method_t) $2 = {
  name = "cateA"
  types = 0x0000000100000e55 "v16@0:8"
  imp = 0x0000000100000cf0 (KCObjc`-[LRPerson(LR) cateA])
}
(lldb) p $0.get(2)
(method_t) $3 = {
  name = "instanceMethod"
  types = 0x0000000100000e55 "v16@0:8"
  imp = 0x0000000100000c60 (KCObjc`-[LRPerson(LRB) instanceMethod])
}
(lldb) p $0.get(3)
(method_t) $4 = {
  name = "sayHappy"
  types = 0x0000000100000e55 "v16@0:8"
  imp = 0x0000000100000b20 (KCObjc`-[LRPerson sayHappy] at LRPerson.m:15)
}
(lldb) p $0.get(4)
(method_t) $5 = {
  name = "instanceMethod"
  types = 0x0000000100000e55 "v16@0:8"
  imp = 0x0000000100000b50 (KCObjc`-[LRPerson instanceMethod] at LRPerson.m:18)
}
(lldb) p $0.get(5)
(method_t) $6 = {
  name = ".cxx_destruct"
  types = 0x0000000100000e55 "v16@0:8"
  imp = 0x0000000100000b80 (KCObjc`-[LRPerson .cxx_destruct] at LRPerson.m:10)
}
(lldb) p $0.get(6)
(method_t) $7 = {
  name = "name"
  types = 0x0000000100000e69 "@16@0:8"
  imp = 0x0000000100000bc0 (KCObjc`-[LRPerson name] at LRPerson.h:15)
}
(lldb) p $0.get(7)
(method_t) $8 = {
  name = "setName:"
  types = 0x0000000100000e71 "v24@0:8@16"
  imp = 0x0000000100000be0 (KCObjc`-[LRPerson setName:] at LRPerson.h:15)
}
(lldb) p $0.get(8)
(method_t) $9 = {
  name = "icon"
  types = 0x0000000100000e69 "@16@0:8"
  imp = 0x0000000100000c10 (KCObjc`-[LRPerson icon] at LRPerson.h:16)
}
(lldb) p $0.get(9)
(method_t) $10 = {
  name = "setIcon:"
  types = 0x0000000100000e71 "v24@0:8@16"
  imp = 0x0000000100000c30 (KCObjc`-[LRPerson setIcon:] at LRPerson.h:16)
}
(lldb) p $0.get(10)
Assertion failed: (i < count), function get, file /Users/liuyang/Desktop/可編譯objc源碼/runtime/objc-runtime-new.h, line 438.
error: Execution was interrupted, reason: signal SIGABRT.
The process has been returned to the state before expression evaluation.
(lldb)

4.懶加載類(lèi) + 懶加載分類(lèi)
read_images的時(shí)候，兩個(gè)分類(lèi)LR和LRB已經(jīng)寫(xiě)入了mach-O

(lldb) p *list
warning: could not find Objective-C class data in the process. This may reduce the quality of type information available.
(method_list_t) $0 = {
  entsize_list_tt<method_t, method_list_t, 3> = {
    entsizeAndFlags = 24
    count = 10
    first = {
      name = "instanceMethod"
      types = 0x0000000100000e60 "v16@0:8"
      imp = 0x0000000100000cd0 (KCObjc`-[LRPerson(LR) instanceMethod])
    }
  }
}
(lldb) p $0.get(0)
(method_t) $1 = {
  name = "instanceMethod"
  types = 0x0000000100000e60 "v16@0:8"
  imp = 0x0000000100000cd0 (KCObjc`-[LRPerson(LR) instanceMethod])
}
(lldb) p $0.get(1)
(method_t) $2 = {
  name = "cateA"
  types = 0x0000000100000e60 "v16@0:8"
  imp = 0x0000000100000d00 (KCObjc`-[LRPerson(LR) cateA])
}
(lldb) p $0.get(2)
(method_t) $3 = {
  name = "instanceMethod"
  types = 0x0000000100000e60 "v16@0:8"
  imp = 0x0000000100000c70 (KCObjc`-[LRPerson(LRB) instanceMethod])
}
(lldb) p $0.get(3)
(method_t) $4 = {
  name = "sayHappy"
  types = 0x0000000100000e60 "v16@0:8"
  imp = 0x0000000100000b30 (KCObjc`-[LRPerson sayHappy] at LRPerson.m:15)
}
(lldb) p $0.get(4)
(method_t) $5 = {
  name = "instanceMethod"
  types = 0x0000000100000e60 "v16@0:8"
  imp = 0x0000000100000b60 (KCObjc`-[LRPerson instanceMethod] at LRPerson.m:18)
}
(lldb) p $0.get(5)
(method_t) $6 = {
  name = ".cxx_destruct"
  types = 0x0000000100000e60 "v16@0:8"
  imp = 0x0000000100000b90 (KCObjc`-[LRPerson .cxx_destruct] at LRPerson.m:10)
}
(lldb) p $0.get(6)
(method_t) $7 = {
  name = "name"
  types = 0x0000000100000e74 "@16@0:8"
  imp = 0x0000000100000bd0 (KCObjc`-[LRPerson name] at LRPerson.h:15)
}
(lldb) p $0.get(7)
(method_t) $8 = {
  name = "setName:"
  types = 0x0000000100000e7c "v24@0:8@16"
  imp = 0x0000000100000bf0 (KCObjc`-[LRPerson setName:] at LRPerson.h:15)
}
(lldb) p $0.get(8)
(method_t) $9 = {
  name = "icon"
  types = 0x0000000100000e74 "@16@0:8"
  imp = 0x0000000100000c20 (KCObjc`-[LRPerson icon] at LRPerson.h:16)
}
(lldb) p $0.get(9)
(method_t) $10 = {
  name = "setIcon:"
  types = 0x0000000100000e7c "v24@0:8@16"
  imp = 0x0000000100000c40 (KCObjc`-[LRPerson setIcon:] at LRPerson.h:16)
}

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iOS底層-17：類(lèi)的加載之category

iOS底層-17：類(lèi)的加載之category

category

1、category的本質(zhì)

attachToClass

extAllocIfNeeded

補(bǔ)充

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九 欧美,1769亚洲,黄色成人av

iOS底層-17：類(lèi)的加載之category

category

1、category的本質(zhì)

attachToClass

extAllocIfNeeded

補(bǔ)充

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九欧美,1769亚洲,黄色成人av