- 方法交换，一般在分类的load方法使用
+(void)load{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
SEL originalSelector = @selector(func);
SEL swizzledSelector = @selector(sf_ func);
Method originalMethod = class_getInstanceMethod(class, originalSelector);
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
BOOL didAddMethod = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
if (didAddMethod) {
class_replaceMethod(class,
swizzledSelector,
method_getImplementation(originalMethod),
method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
});
}
- 获取方法列表
//获取方法列表
unsigned int method_count;
Method *methods = class_copyMethodList([self class], &method_count);
for (int i = 0; i < method_count; i++) {
Method method = methods[I];
SEL selector = method_getName(method);
NSString *method_name = NSStringFromSelector(selector);
NSLog(@"method_name:%@",method_name);
}
free(methods);
- 获取实例变量列表
//获取实例变量列表
unsigned int ivar_count;
Ivar *ivars = class_copyIvarList([self class], &ivar_count);
for(int i = 0; i < ivar_count; i++) {
Ivar ivar = ivars[I];
NSString *ivar_name = [NSString stringWithUTF8String:ivar_getName(ivar)];
NSLog(@"ivar_name:%@", ivar_name);
}
free(ivars);
- 获取实例属性列表
//获取实例属性列表
unsigned int property_count;
objc_property_t *propertyArray = class_copyPropertyList([self class], &property_count);
for (int i = 0; i < property_count; i++) {
objc_property_t property = propertyArray[I];
NSString *property_name = [NSString stringWithUTF8String:property_getName(property)];
NSLog(@"property_name:%@", property_name);
}
free(propertyArray);
- 获取协议列表
//获取协议列表
unsigned int protocol_count;
Protocol *__unsafe_unretained*protocolList = class_copyProtocolList([self class], &protocol_count);
for (int i = 0; i<protocol_count; i++) {
Protocol *protocal = protocolList[I];
NSString *protocal_name = [NSString stringWithUTF8String:protocol_getName(protocal)];
NSLog(@"protocal_name:%@", protocal_name);
}
free(protocolList);
- 为类别添加属性（通过关联对象）
@property (nonatomic, strong) NSString *test;
- (NSString *)test{
return objc_getAssociatedObject(self, @selector(test));
}
- (void)setTest:(NSString *)test{
objc_setAssociatedObject(self, @selector(test), test, OBJC_ASSOCIATION_COPY);
}
| objc_AssociationPolicy | 说明 |
|---|---|
| OBJC_ASSOCIATION_ASSIGN | assign |
| OBJC_ASSOCIATION_RETAIN_NONATOMIC | nonatomic, strong |
| OBJC_ASSOCIATION_COPY_NONATOMIC | nonatomic, copy |
| OBJC_ASSOCIATION_RETAIN | atomic, strong |
| OBJC_ASSOCIATION_COPY | atomic, copy |
- 动态添加实例方法
+ (BOOL)resolveInstanceMethod:(SEL)sel{
if (sel == @selector(test)) {
Method method = class_getInstanceMethod(self, @selector(test1));
class_addMethod(self, sel, method_getImplementation(method), method_getTypeEncoding(method));
return YES;
}
return [super resolveInstanceMethod:sel];
}
- 动态添加类方法
+ (BOOL)resolveClassMethod:(SEL)sel{
if (sel == @selector(classTest)) {
Method method = class_getClassMethod(object_getClass(self), @selector(classTest1));
class_addMethod(object_getClass(self), sel, method_getImplementation(method), method_getTypeEncoding(method));
return YES;
}
return [super resolveClassMethod:sel];
}
附-runtime函数
Runtime API01 – 类
动态创建一个类（参数：父类，类名，额外的内存空间）
Class objc_allocateClassPair(Class superclass, const char *name, size_t extraBytes)
注册一个类（要在类注册之前添加成员变量）
void objc_registerClassPair(Class cls)
销毁一个类
void objc_disposeClassPair(Class cls)
获取isa指向的Class
Class object_getClass(id obj)
设置isa指向的Class
Class object_setClass(id obj, Class cls)
判断一个OC对象是否为Class
BOOL object_isClass(id obj)
判断一个Class是否为元类
BOOL class_isMetaClass(Class cls)
获取父类
Class class_getSuperclass(Class cls)
Runtime API02 – 成员变量
获取一个实例变量信息
Ivar class_getInstanceVariable(Class cls, const char *name)
拷贝实例变量列表（最后需要调用free释放）
Ivar *class_copyIvarList(Class cls, unsigned int *outCount)
设置和获取成员变量的值
void object_setIvar(id obj, Ivar ivar, id value)
id object_getIvar(id obj, Ivar ivar)
动态添加成员变量（已经注册的类是不能动态添加成员变量的）
BOOL class_addIvar(Class cls, const char * name, size_t size, uint8_t alignment, const char * types)
获取成员变量的相关信息
const char *ivar_getName(Ivar v)
const char *ivar_getTypeEncoding(Ivar v)
Runtime API03 – 属性
获取一个属性
objc_property_t class_getProperty(Class cls, const char *name)
拷贝属性列表（最后需要调用free释放）
objc_property_t *class_copyPropertyList(Class cls, unsigned int *outCount)
动态添加属性
BOOL class_addProperty(Class cls, const char *name, const objc_property_attribute_t *attributes,
unsigned int attributeCount)
动态替换属性
void class_replaceProperty(Class cls, const char *name, const objc_property_attribute_t *attributes,
unsigned int attributeCount)
获取属性的一些信息
const char *property_getName(objc_property_t property)
const char *property_getAttributes(objc_property_t property)
Runtime API04 – 方法
获得一个实例方法、类方法
Method class_getInstanceMethod(Class cls, SEL name)
Method class_getClassMethod(Class cls, SEL name)
方法实现相关操作
IMP class_getMethodImplementation(Class cls, SEL name)
IMP method_setImplementation(Method m, IMP imp)
void method_exchangeImplementations(Method m1, Method m2)
拷贝方法列表（最后需要调用free释放）
Method *class_copyMethodList(Class cls, unsigned int *outCount)
动态添加方法
BOOL class_addMethod(Class cls, SEL name, IMP imp, const char *types)
动态替换方法
IMP class_replaceMethod(Class cls, SEL name, IMP imp, const char *types)
获取方法的相关信息（带有copy的需要调用free去释放）
SEL method_getName(Method m)
IMP method_getImplementation(Method m)
const char *method_getTypeEncoding(Method m)
unsigned int method_getNumberOfArguments(Method m)
char *method_copyReturnType(Method m)
char *method_copyArgumentType(Method m, unsigned int index)
选择器相关
const char *sel_getName(SEL sel)
SEL sel_registerName(const char *str)
用block作为方法实现
IMP imp_implementationWithBlock(id block)
id imp_getBlock(IMP anImp)
BOOL imp_removeBlock(IMP anImp)
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