前言
学如逆水行舟,不进则退。共勉!!!
做iOS开发这么多年了,给我的感觉就是现在新鲜血液越来越少了。只剩下中高级人员越来越卷,新人也不愿意进入iOS开发圈子。但是我自认为成为iOS开发还是不错的,相比于其他的IT行业还是没有那么卷,而且薪资待遇也是非常不错的,而且现在中高级开发甚至是有缺口的,毕竟苹果在全球市场的占比也是越来越多了,所以根本不用担心找不到工作,担心的其实是怎样提升自己。
说了那么多,基于我自己的开发经验给大家总结了一份runtime资料,希望能给需要的人提供到一点帮助。如有错误还请在评论区留言指正。希望看官都能点点赞啥的支持一下,让更多人的人看到。也可以关注一下我主页,加入我的圈子,互相交流学习。我也会持续分享一些对于ios的一些认知。
编码值
//编码值 含义
//c 代表char类型
//i 代表int类型
//s 代表short类型
//l 代表long类型,在64位处理器上也是按照32位处理
//q 代表long long类型
//C 代表unsigned char类型
//I 代表unsigned int类型
//S 代表unsigned short类型
//L 代表unsigned long类型
//Q 代表unsigned long long类型
//f 代表float类型
//d 代表double类型
//B 代表C++中的bool或者C99中的_Bool
//v 代表void类型
//* 代表char *类型
//@ 代表对象类型
//# 代表类对象 (Class)
//: 代表⽅法selector (SEL)
//[array type] 代表array
//{name=type…} 代表结构体//(name=type…) 代表union
//bnum A bit field of num bits
//^type A pointer to type
//? An unknown type (among other things, this code is used for function pointers)
Working with Instances(使⽤实例)
ARC模式不可⽤object_copy
ARC模式不可⽤object_dispose
ARC模式不可⽤object_setInstanceVariable
ARC模式不可⽤object_getInstanceVariable
ARC模式不可⽤object_getIndexedIvars
Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]);
//参数:1.对象obj 2.实例变量ivar
//返回:id
NSString *result = object_getIvar(self, ivar);
NSLog(@"lg_object_getIvar:%@",result);
object_getIvar(获取对象中实例变量的值)
Ivar ivar =class_getInstanceVariable(self.class, [@"_logic" UTF8String]);
//参数:1.对象obj 2.实例变量ivar 3.实例变量的值id object_setIvar(self, ivar, @"123456");
object_setIvar(设置对象中实例变量的值)
//参数:对象obj
//返回:对象的类名
const char*result = object_getClassName(self);
NSLog(@"lg_object_getClassName:%@",[NSString stringWithUTF8String:result]);
object_getClassName(获取对象的类名)
//参数:对象obj
//返回:类Class
Class result = object_getClass(self);
NSLog(@"lg_object_getClass:%@",result);
object_getClass(获取对象的类对象)
//参数:1.对象obj 2.类Class
//返回:类Class
Class result = object_setClass(self, [UIViewController class]);
NSLog(@"lg_object_setClass:%@",result);
object_setClass(设置对象的类)
Obtaining Class Definitions(获取类定义)
//参数:1.传NUll获取当前注册的所有类 2.传0
//返回:所有注册类的总数
int result = objc_getClassList(NULL, 0);
NSLog(@"lg_objc_getClassList:%d",result);
objc_getClassList(获取已注册的类的数量)
unsigned int outCount;
//参数:整数指针
//返回:已注册的类的指针列表
Class *result =objc_copyClassList(&outCount);
for (int i = 0; i < outCount; i++) {
NSLog(@"lg_objc_copyClassList:%s", class_getName(result[i])); } free(result);
objc_copyClassList(获取所有已注册的类)
//参数:类的名称
//返回:类Class
Class result =objc_lookUpClass([@"ViewController"
UTF8String]);
NSLog(@"lg_objc_lookUpClass:%@",result);
objc_lookUpClass(获取指定的类定义)
//参数:类的名称
//返回:类Class
Class result =objc_getClass([@"ViewController" UTF8String]);
NSLog(@"lg_objc_getClass:%@",result);
objc_getClass(获取指定的类定义)
//参数:类的名称
//返回:类Class
Class result = objc_getRequiredClass([@"ViewController" UTF8String]);
NSLog(@"lg_objc_getRequiredClass:%@",result);
objc_getRequiredClass(获取指定的类定义)
//参数:类的名称
//返回:类Class
id result = objc_getMetaClass([@"ViewController"
UTF8String]);
NSLog(@"objc_getMetaClass:%@",result);
objc_getMetaClass(获取指定的类的元类定义)
Working with Instance Variables(使⽤实例变量)
Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]);
//参数:Ivar
//返回:实例变量的名称
const char *result = ivar_getName(ivar);
NSLog(@"lg_ivar_getName:%@",[NSString stringWithUTF8String:result]);
ivar_getName(获取实例变量名称)
Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]);
//参数:Ivar
//返回:实例变量的类型
const char *result = ivar_getTypeEncoding(ivar);
NSLog(@"lg_ivar_getTypeEncoding:%@",[NSString stringWithUTF8String:result]);
ivar_getTypeEncoding(获取实例变量的类型)
Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]);
//参数:Ivar
//返回:实例变量的类型
ptrdiff_t result = ivar_getOffset(ivar);
NSLog(@"lg_ivar_getOffset:%td",result);
ivar_getOffset(获取实例变量的偏移量)
Associative References(关联引⽤)
/**
policy:关联策略。有五种关联策略。
OBJC_ASSOCIATION_ASSIGN 等价于 @property(assign)。
OBJC_ASSOCIATION_RETAIN_NONATOMIC等价于 @property(strong, nonatomic)。
OBJC_ASSOCIATION_COPY_NONATOMIC等价于@property(copy, nonatomic)。
OBJC_ASSOCIATION_RETAIN等价于@property(strong,atomic)。
OBJC_ASSOCIATION_COPY等价于@property(copy, atomic)。
*/
//参数:1.要关联的对象 2.全局唯⼀KEY 3.关联的obj 4.关联策略policy
objc_setAssociatedObject(self, [@"LGKey" UTF8String], @"123456",
OBJC_ASSOCIATION_COPY_NONATOMIC);
objc_setAssociatedObject(设置关联)
//参数:1.关联的对象 2.key
//返回:关联的值
id result = objc_getAssociatedObject(self, [@"LGKey" UTF8String]);
NSLog(@"lg_objc_getAssociatedObject:%@",result);
objc_getAssociatedObject(获取关联的值)
//参数:关联的对象objc_removeAssociatedObjects(self);
objc_removeAssociatedObjects(删除关联)
Sending Messages(发送消息)
向类的实例发送带有简单返回值的消息 objc_msgSend
将带有浮点返回值的消息发送到类的实例 objc_msgSend_fpret
将带有数据结构返回值的消息发送到类的实例 objc_msgSend_stret
将带有简单返回值的消息发送到类实例的超类 objc_msgSendSuper
将带有数据结构返回值的消息发送到类实例的超类 objc_msgSendSuper_stret
Working with Methods(使⽤⽅法)
调⽤⽅法
method_invoke
调⽤返回值为结构体的⽅法
method_invoke_stret
method_getName(获取⽅法的名称)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:Mothod
//返回:SEL指针
SEL result = method_getName(method);
NSLog(@"lg_method_getName:%p",result);
method_getImplementation(获取⽅法的实现)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:Mothod
//返回:IMP指针
IMP result = method_getImplementation(method);
NSLog(@"lg_method_getImplementation:%p",result);
method_getTypeEncoding)(获取描述⽅法的参数和返回值类型的字符串
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:Method
//返回:描述⽅法的参数和返回值类型的字符串
const char *result = method_getTypeEncoding(method);
NSLog(@"lg_method_getTypeEncoding:%@",[NSString stringWithUTF8String:result]);
(获取⽅法的返回值类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:Method
//返回:⽅法的返回值类型
char *result = method_copyReturnType(method);
NSLog(@"lg_method_copyReturnType:%@",[NSString stringWithUTF8String:result]);
method_copyReturnType
method_copyArgumentType(获取⽅法的单个参数类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:1.Method 2.unsigned int参数索引
//返回:参数类型
char *result = method_copyArgumentType(method, 0);
NSLog(@"lg_method_copyReturnType:%@",[NSString stringWithUTF8String:result]);
free(result);
method_getReturnType(获取⽅法的返回值类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:1.Method 2.char数组 3.char数组的⻓度
char result[10];
method_getReturnType(method,result,sizeof(result));
NSLog(@"lg_method_getReturnType:%@",[NSString stringWithUTF8String:result]);
method_getNumberOfArguments(获取⽅法参数的数量)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:Method
//返回:参数的个数
unsigned int result = method_getNumberOfArguments(method);
NSLog(@"lg_method_getNumberOfArguments:%d",result);
method_getArgumentType(获取单个参数的类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
char result[10];
//参数:1.Method 2.参数索引 3.char数组 4.char数组的⻓度
method_getArgumentType(method, 0, result, sizeof(result));
NSLog(@"lg_method_getArgumentType:%@",[NSString stringWithUTF8String:result]);
method_getDescription(获取⽅法的结构体)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
//参数:Method
//返回:⽅法的结构体
struct objc_method_description *result = method_getDescription(method);
NSLog(@"lg_method_getDescription:%p",result);
method_setImplementation(设置⽅法的实现)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
IMP imp = class_getMethodImplementation(self.class, @selector(lg_method1));
//参数:1.Method 2.IMP
//返回:⽅法的先前实现
IMP result = method_setImplementation(method, imp);
NSLog(@"lg_method_setImplementation:%p",result); result();
[self lg_method];
method_exchangeImplementations(交换俩个⽅法的实现)
Method method1 = class_getInstanceMethod(self.class, @selector(lg_method1));
Method method2 = class_getInstanceMethod(self.class, @selector(lg_method2));
//参数:Method
method_exchangeImplementations(method1, method2);
[self lg_method1];
[self lg_method2];
Working with Properties(使⽤属性)
property_getName(获取属性的名称)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]);
//参数:objc_property_t
//返回:属性的名称
const char *result = property_getName(t);
NSLog(@"lg_property_getName:%@",[NSString stringWithUTF8String:result]);
property_getAttributes(获取属性的属性)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]);
//参数:objc_property_t
//返回:属性的属性
const char *result = property_getAttributes(t);
NSLog(@"lg_property_getAttributes:%@",[NSString stringWithUTF8String:result]);
property_copyAttributeValue(获取属性的指定属性的值)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]);
//参数:1.objc_property_t 2.属性的属性
//返回:属性的属性的值
char *result = property_copyAttributeValue(t, [@"T" UTF8String]);
NSLog(@"lg_property_copyAttributeValue:%@",[NSString stringWithUTF8String:result]);
property_copyAttributeList(获取属性的属性列表)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]);
unsigned int count = 0;
//参数:1.objc_property_t 2.unsigned int *
//返回:属性的属性列表
objc_property_attribute_t *result = property_copyAttributeList(t, &count);
for (int i = 0; i < count; i ++) {
objc_property_attribute_t t = result[i];
NSLog(@"lg_property_copyAttributeList:%@",[NSString stringWithUTF8String:t.name]);
}
Using Objective-C Language Features(使⽤OC语⾔特性)
objc_enumerationMutation(检测到突变时,编译器将插⼊次函数 并且调⽤
objc_setEnumerationMutationHandler设置的回调函数,如果没有设置,则会崩溃)
//参数:idobjc_enumerationMutation(self);
objc_setEnumerationMutationHandler(设置突变处理函数)
/参数:函数指针
objc_setEnumerationMutationHandler(enumerationMutationHandler);
imp_implementationWithBlock(通过block获取⼀个⽅法的实现)
void (^blcok) (NSString *) = ^(NSString *str) {
NSLog(@"lg_imp_implementationWithBlock");
};
//参数:block
//返回:IMP
IMP result = imp_implementationWithBlock(blcok); result();
imp_getBlock(通过IMP获取Block)
void (^blcok) (NSString *) = ^(NSString *str) {
NSLog(@"lg_imp_implementationWithBlock:%@",str);
};
//参数:IMP
//返回:block
void (^result) (NSString *) = imp_getBlock(imp_implementationWithBlock(blcok));
result(@"hello word");
imp_removeBlock(解除IMP与Block关联)
//参数:IMP
//返回:BOOL
BOOL result = imp_removeBlock(class_getMethodImplementation(self.class, NSSelectorFromString(@"lg_method")));
NSLog(@"lg_imp_removeBlock:%d",result);
objc_loadWeak
该函数加载⼀个弱指针引⽤的对象,并在对其做retain和autoreleasing操作后返回它。这样,对象就可以在调⽤者使⽤它时保持⾜够⻓的⽣命周期。该函数典型的⽤法是在任何有使⽤__weak变量的表达式中使⽤
objc_storeWeak
该函数的典型⽤法是⽤于__weak变量做为赋值对象时
Working with Classes(操作类)
class_getName(获取类的名称)
//参数:类Class
//返回:类Class Class result =
class_getSuperclass([ViewController class]);
NSLog(@"lg_class_getName:%@",result);
class_getSuperclass(获取⽗类)
//参数:类Class
//返回:⽗类Class
Class result = class_getSuperclass([ViewController class]);
NSLog(@"lg_class_getName:%@",result);
class_isMetaClass(判断类是否是元类)
//参数:类Class
//返回:BOOL类型
BOOL result = class_isMetaClass([ViewController class]);
NSLog(@"lg_class_isMetaClass:%d",result);
class_getInstanceSize(获取类的实例⼤⼩)
//参数:类Class
//返回:类的实例⼤⼩
size_t result = class_getInstanceSize([ViewController class]);
NSLog(@"lg_class_getInstanceSize:%zu",result);
class_getInstanceVariable(获取类中指定的实例变量的信息的数据结构的指针)
//参数:类Class 实例变量的名称
//返回:Ivar指针
const char *result1 = [@"_logic" UTF8String];
Ivar result2 = class_getInstanceVariable([self class], result1);
NSLog(@"lg_class_getInstanceVariable:%p",result2);
class_getClassVariable(获取类中指定的类变量的信息的数据结构的指针)
//参数:1.类Class 2.类变量名称
//返回:指定的类变量的信息的数据结构的指针
Ivar ivar = class_getClassVariable(self.class, [@"isa" UTF8String]);
NSLog(@"lg_class_getClassVariable:%p",ivar);
class_addIvar(向类添加新的实例变量)
Class CreatClass0 = objc_allocateClassPair([NSObject class], "CreatClass0", 0);
class_addIvar(CreatClass0, "_attribute0", sizeof(NSString *), log(sizeof(NSString *)), "i");
Ivar ivar = class_getInstanceVariable(CreatClass0, "_attribute0");
NSLog(@"lg_class_addIvar:%@",[NSString stringWithUTF8String:ivar_getName(ivar)]); objc_registerClassPair(CreatClass0);
不⽀持向现有类添加实例变量
class_copyIvarList(获取类的实例变量列表)
//⼊参:1、类Class 2、unsigned int类型
//返回:Ivar 类型的指针数组
unsigned int copyIvarListCount = 0;
Ivar *ivars = class_copyIvarList([self class], ©IvarListCount);
for (NSInteger i = 0; i< copyIvarListCount; i ++) {
Ivar ivar = ivars[i];
const char *name = ivar_getName(ivar);
NSLog(@"lg_class_copyIvarList:%s",name);
}
free(ivars);//释放
class_getIvarLayout(获取类的布局描述)
//参数:类Class
//返回:返回值是指向 uint8_t 的指针
const uint8_t *result = class_getIvarLayout(self.class);
NSLog(@"lg_class_getIvarLayout:%p",result);
class_setIvarLayout(设置类的实例变量的修饰符)
uint8_t u = 1;
const uint8_t *u8 = &u;
//参数:1.类Class 2.const uint8_t *
class_setIvarLayout(self.class, u8);
class_getWeakIvarLayout(获取类的weak修饰的实例变量)
//参数:类Class
//返回:返回值是指向 uint8_t 的指针
const uint8_t *result = class_getWeakIvarLayout(self.class);
NSLog(@"lg_class_getIvarLayout:%p",result);
class_setWeakIvarLayout(设置类的实例变量的修饰符为weak)
uint8_t u = 1;
const uint8_t *u8 = &u;
//参数:1.类Class 2.const uint8_t *
class_setWeakIvarLayout(self.class, u8);
class_getProperty(获取指定的属性)
//参数:1.类Class 2.属性名
//返回:属性objc_property_t
objc_property_t result = class_getProperty(self.class, [@"logic" UTF8String]);
NSLog(@"lg_class_getProperty:%p",result);
class_copyPropertyList(获取整个属性列表)
//参数:1.类Class 2.unsigned int类型
//返回:属性列表
unsigned int copyPropertyListCount = 0;
objc_property_t *propertys = class_copyPropertyList([self class], ©PropertyListCount);
for (NSInteger i = 0; i < copyPropertyListCount; i++) {
objc_property_t property = propertys[i];
const char *name = property_getName(property);
NSLog(@"lg_class_copyPropertyList:%s",name);
}
free(propertys);//释放
class_addMethod(给类添加⽅法)
//参数:1.类Class 2.⽅法名 3.imp,函数实现 4.⽅法参数类型描述
//返回值:BOOL
BOOL result = class_addMethod(self.class,
NSSelectorFromString(@"lgMethod"), [self
methodForSelector:@selector(lg_method)], "@@:");
NSLog(@"lg_addMethod:%d",result);
class_getInstanceMethod(获取类的实例⽅法)
//参数:1.类Class 2.⽅法名SEL
//返回:method结构体指针
Method result = class_getInstanceMethod(self.class, @selector(lg_method));
NSLog(@"lg_class_getInstanceMethod:%p",result);
class_getClassMethod(获取类⽅法)
//⼊参:1.类Class 2.⽅法名SEL
//返回:method结构体指针
Method result = class_getClassMethod(self.class, @selector(lgClassMethod));
NSLog(@"lg_class_getClassMethod:%p",result);
class_copyMethodList(获取整个类的实例⽅法)
//参数:1、类Class 2、unsigned int 类型
//返回:整个类的实例⽅法
unsigned int copycopyMethodListCount = 0;
Method *methods = class_copyMethodList([self class], ©copyMethodListCount); for (NSInteger i = 0; i < copycopyMethodListCount; i++) { Method method = methods[i]; SEL name = method_getName(method);
NSLog(@"lg_class_copyMethodList:%@",NSStringFromSelector(name)); }
free(methods);//释放
class_replaceMethod(交换⽅法)
[self lg_method1];
//参数:1.类Class 2.⽅法名SEL 3.⽅法的实现IMP 4.⽅法参数描述
//返回:BOOL
BOOL result = class_replaceMethod([self class], @selector(lg_method1), [self methodForSelector:@selector(lg_method2)], NULL);
NSLog(@"lg_class_replaceMethod:%d",result);
[self lg_method1];
class_getMethodImplementation(获取⽅法实现)
//参数:1.类Class 2.⽅法名SEL
//返回:⽅法实现IMP
IMP result = class_getMethodImplementation([ViewController class], @selector(lg_method));
result();
class_getMethodImplementation_stret
not available in arm64,跟class_getMethodImplementation⽅法⼀样的
class_respondsToSelector(判断是否响应⽅法)
//参数:1.类Class 2.⽅法名SEL
/返回:BOOL
BOOL result = class_respondsToSelector(self.class, @selector(viewDidLoad));
NSLog(@"lg_class_respondsToSelector:%d",result);
class_addProtocol(向类添加协议)
//参数:1.类Class 2.协议
//返回:BOOL
BOOL result = class_addProtocol([self class],
NSProtocolFromString(@"UITableViewDelegate"));
NSLog(@"lg_class_addProtocol:%d",result);
class_addProperty(为类添加属性)
objc_property_attribute_t type = { "T", "@\"NSString\"" };
objc_property_attribute_t ownership = { "C", "" }; // C = copy
objc_property_attribute_t backingivar = { "V", "_attribute0" };
objc_property_attribute_t attrs[] = { type, ownership, backingivar };
//参数:1.类Class 2.属性数组 3.属性个数
//返回值:BOOL
BOOL suc0 = class_addProperty(self.class, "_attribute0", attrs, 3);
SEL getter = NSSelectorFromString(@"attribute0");
SEL setter = NSSelectorFromString(@"setAttribute0:");
BOOL suc1 = class_addMethod(self.class, getter, (IMP)attribute0Getter, "@@:");
BOOL suc2 = class_addMethod(self.class, setter, (IMP)attribute0Setter, "v@:@");
NSLog(@"lg_class_addProperty:class_addProperty = %d,class_addMethod_Getter = %d,class_addMethod_Setter = %d",suc0,suc1,suc2);
class_replaceProperty(替换类的属性)
objc_property_attribute_t type = { "T", "@\"NSString\"" };
objc_property_attribute_t ownership = { "C", "" }; // C = copy
objc_property_attribute_t backingivar = { "V", "_attribute0" };
objc_property_attribute_t attrs[] = { type, ownership, backingivar };
//参数:1.类Class 2.属性名称 3.属性的相关属性 4.属性的相关属性的个数
class_replaceProperty(self.class, [@"logic" UTF8String], attrs, 3);
class_conformsToProtocol(判断是否遵循某个协议)
//参数:1.类Class 2.协议
//返回:BOOL
BOOL result = class_conformsToProtocol(self.class,
NSProtocolFromString(@"UITableViewDelegate"));
NSLog(@"lg_class_conformsToProtocol:%d",result);
class_copyProtocolList(获取协议列表)
//⼊参:1、类Class 2、unsigned int 类型
//返回:整个类的遵循的协议
unsigned int copyProtocolListCount = 0;
Protocol * __unsafe_unretained *protocals = class_copyProtocolList([self class], ©ProtocolListCount);
for (NSInteger i = 0; i < copyProtocolListCount; i++) {
Protocol * protocal = protocals[i];
const char *name = protocol_getName(protocal);
NSLog(@"lg_class_copyProtocolList:%s",name);
}
free(protocals);//释放
class_getVersion( 获取类的版本号)
//参数:类Class
//返回:版本号
int result = class_getVersion(self.class);
NSLog(@"lg_class_getVersion:%d",result);
class_setVersion(设置类的版本号)
//参数:1.类Class 2.int class_setVersion(self.class, 100);
objc_getFutureClass不要⾃⼰调⽤这个函数
objc_setFutureClass不要⾃⼰调⽤这个函数
Adding Classes(添加类)
objc_allocateClassPair(添加⼀个新类)
//参数:1.新添加类的⽗类 2.新类的名称 3.填0
//返回:新类
Class result = objc_allocateClassPair([NSObject class], [@"NewClass" UTF8String], 0);
NSLog(@"lg_objc_allocateClassPair:%p",result);
objc_disposeClassPair(销毁⼀个类)
//参数:类Class
objc_disposeClassPair(result);
objc_registerClassPair(注册使⽤类)
Class result = objc_allocateClassPair([NSObject class], [@"NewClass" UTF8String], 0);
//参数:类Class
objc_registerClassPair(result);
objc_duplicateClass
不要⾃⼰调⽤这个函数
nstantiating Classes(实例化类)
class_createInstance(类实例化)
//参数:1.类Class 2.额外分配的字节数
//返回:类的实例
NSObject *result = class_createInstance([NSObject class], 0);
NSLog(@"lg_class_createInstance:%@",result);
objc_constructInstanceARC模式下不可⽤
objc_destructInstanceARC模式下不可⽤
Working with Libraries(使⽤库)
objc_copyImageNames(获取所有objc的框架和动态库)
unsigned int a = 0;
//参数:unsigned int *
//返回:C字符串数组
const char **result =
objc_copyImageNames(&a); for (int i = 0; i < a; i ++) { const char *c = result[i];
NSLog(@"lg_objc_copyImageNames:%@",[NSString stringWithUTF8String:c]);
}
class_getImageName(获取类源⾃的动态库的名称)
//参数:类Class
//返回:源⾃的动态库的名称
const char *result = class_getImageName(self.class);
NSLog(@"lg_class_getImageName:%@",[NSString stringWithUTF8String:result]);
objc_copyClassNamesForImage(获取指定库或框架中的所有类的名称)
unsigned int outCount = 0;
Dl_info info;
dladdr(&_mh_execute_header, &info);
//参数:1.库或者框架 2.unsigned int *
//返回:指定库或框架中的所有类的名称
const char **result = objc_copyClassNamesForImage(info.dli_fname, &outCount);
for (int i = 0; i < outCount; i ++) { const char *c = result[i];
NSLog(@"lg_objc_copyClassNamesForImage:%@",[NSString stringWithUTF8String:c]);
}
Working with Selectors(使⽤选择器)
sel_getName(获取⽅法的名称)
SEL sel = NSSelectorFromString(@"lg_method");
//参数:SEL
//返回:⽅法的名称
const char *result = sel_getName(sel);
NSLog(@"lg_sel_getName:%@",[NSString stringWithUTF8String:result]);
sel_registerName(注册⽅法)
//参数:const char *
//返回:SEL
SEL result = sel_registerName([@"lglglg" UTF8String]);
NSLog(@"lg_sel_registerName:%p",result);
sel_isEqual(判断俩个选择器是否相等)
SEL sel1 = NSSelectorFromString(@"lg_method1");
SEL sel2 = NSSelectorFromString(@"lg_method2");
//参数:SEL
//返回:BOOL
BOOL result = sel_isEqual(sel1, sel2);
NSLog(@"lg_sel_isEqual:%d",result);
Working with Protocols(使⽤协议)
objc_getProtocol(获取指定的协议)
//参数:协议名称
//返回:协议
Protocol *result = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
NSLog(@"lg_objc_getProtocol:%@",result);
objc_copyProtocolList(获取所有的协议列表)
unsigned int count = 0;
//参数:unsigned int *
//返回:所有的协议列表
Protocol __unsafe_unretained **result = objc_copyProtocolList(&count); for (int i = 0; i < count; i ++) {
Protocol *pro = result[i];
NSLog(@"lg_objc_copyProtocolList:%@",pro); }
objc_allocateProtocol(创建协议)
//参数:协议的名称
//返回:协议
Protocol *result = objc_allocateProtocol([@"LGProtocol" UTF8String]);
NSLog(@"lg_objc_allocateProtocol:%@",result);
objc_registerProtocol(注册协议)
Protocol *result = objc_allocateProtocol([@"LGProtocol" UTF8String]);
//参数:协议Protocol
objc_registerProtocol(result);
protocol_addMethodDescription(向协议添加新⽅法)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
//参数:1.协议Protocol 2.SEL 3.⽅法名称 4.是否为协议必须⽅法 5.是否为实例⽅法
protocol_addMethodDescription(pro, NSSelectorFromString(@"lg_method"), [@"lgProtocolMethod" UTF8String], YES, YES);
protocol_addProperty(向协议添加属性)
Protocol *pro = objc_allocateProtocol([@"LGProtocol" UTF8String]);
objc_property_attribute_t type = { "T", "@\"NSString\"" };
objc_property_attribute_t ownership = { "C", "" }; // C = copy
objc_property_attribute_t backingivar = { "V", "_logic" };
objc_property_attribute_t attrs[] = { type, ownership, backingivar };
//参数:1.协议Protocol 2.属性的名称 3.属性的属性 4.属性的属性的个数 5.是否为协议的必须⽅法 6.填YES protocol_addProperty(pro, [@"logic" UTF8String], attrs, 3, YES, YES);
protocol_getName(获取协议的名称)Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
//参数:协议Protocol
//返回:协议名称
const char *result = protocol_getName(pro);
NSLog(@"lg_protocol_getName:%@",[NSString stringWithUTF8String:result]);
protocol_isEqual(判断俩个协议是否相等)
Protocol *pro1 = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
Protocol *pro2 = objc_getProtocol([@"UITableViewDataSource" UTF8String]);
//参数:Protocol
//返回:BOOL
BOOL result = protocol_isEqual(pro1, pro2);
NSLog(@"lg_protocol_isEqual:%d",result);
protocol_copyMethodDescriptionList(获取满⾜条件的协议的⽅法列表)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); unsigned int count = 0;
//参数:1.Protocol 2.是否为必须⽅法 3.是否为实例⽅法 4.unsigned int * struct objc_method_description *result = protocol_copyMethodDescriptionList(pro, NO, YES, &count); for (int i = 0; i < count; i ++) {
struct objc_method_description des = result[i];
NSLog(@"lg_protocol_copyMethodDescriptionList:%p",des.name);
}
protocol_getMethodDescription(获取协议中指定⽅法的描述结构体)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
//参数:1.Protocol 2.SEL 3.是否为必须⽅法 4.是否为实例⽅法
struct objc_method_description result = protocol_getMethodDescription(pro,
NSSelectorFromString(@"tableView:willDisplayCell:forRowAtIndexPath:"), NO, YES);
NSLog(@"lg_protocol_getMethodDescription:%p",result.name);
protocol_copyPropertyList(获取协议的属性列表)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
unsigned int count = 0;
//参数:1.Protocol 2.unsigned int *
//返回:协议的属性列表
objc_property_t *result = protocol_copyPropertyList(pro, &count); for (int i = 0; i < count; i ++) {
objc_property_t t = result[i];
NSLog(@"lg_protocol_copyPropertyList:%p",t);
}
protocol_getProperty(获取协议中指定的属性)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
//参数:1.Protocol 2.属性名称 3.是否为必须⽅法 4.是否为实例⽅法
objc_property_t result = protocol_getProperty(pro, [@"" UTF8String], YES, YES);
NSLog(@"lg_protocol_getProperty:%p",result);
protocol_copyProtocolList(获取协议中采⽤的协议列表)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
unsigned int count = 0;
//参数:1.Protocol 2.unsigned int * /
/返回:协议列表
Protocol __unsafe_unretained **result = protocol_copyProtocolList(pro, &count);
for (int i = 0; i < count; i ++) {
Protocol *p = result[i];
NSLog(@"lg_protocol_copyProtocolList:%@",p);
}
free(result);
protocol_conformsToProtocol(判断⼀个协议是否遵循另⼀个协议)
Protocol *pro1 = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
Protocol *pro2 = objc_getProtocol([@"UIScrollViewDelegate" UTF8String]);
//参数:Protocol
//返回:BOOL
BOOL result = protocol_conformsToProtocol(pro1, pro2);
NSLog(@"lg_protocol_conformsToProtocol:%d",result);
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