NSObject常用方法

类

@interface NSObject <NSObject> {
    Class isa  OBJC_ISA_AVAILABILITY;
}
// 初始化加载
+ (void)load;
// 初始化对象
+ (void)initialize;
// 初始化对象，分配内存
- (instancetype)init;
// 分配一个新的接受类实例，并发送init消息，返回初始化对象
+ (instancetype)new;
// init后系统自动调用该方法，用于内存分配
+ (instancetype)allocWithZone:(struct _NSZone *)zone;
// 内存中为一个对象分配内存，并返回实例
+ (instancetype)alloc;
// 用于类释放对象实例并释放动态内存
- (void)dealloc;
// 标明该对象需要释放
- (void)finalize;
// 复制一个imutable的对象
- (id)copy;
// 复制一个mutable的对象
- (id)mutableCopy;
// <NSCopying>协议后实现的copy方法
+ (id)copyWithZone:(struct _NSZone *)zone;
// <NSCopying>协议后实现的mutablecopy方法
+ (id)mutableCopyWithZone:(struct _NSZone *)zone;
// 类是否存在该方法
+ (BOOL)instancesRespondToSelector:(SEL)aSelector;
// 类是否实现该协议
+ (BOOL)conformsToProtocol:(Protocol *)protocol;
// 返回对象中指定的函数指针
- (IMP)methodForSelector:(SEL)aSelector;
// 返回类中指定的函数指针
+ (IMP)instanceMethodForSelector:(SEL)aSelector;
// 该对象找不到对应的实现方法时执行该方法，用于抛出异常
- (void)doesNotRecognizeSelector:(SEL)aSelector;
// 若返回非nil，非self，则将详细转发给该对象，否则继续其他流程
- (id)forwardingTargetForSelector:(SEL)aSelector;
// 与上一个类似，但该方法可转发给多个对象，是最后一个寻找IML的机会
- (void)forwardInvocation:(NSInvocation *)anInvocation;
// 让重载方有机会抛出函数签名，再由上一个方法执行
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector;
// 同上，该方法为类方法
+ (NSMethodSignature *)instanceMethodSignatureForSelector:(SEL)aSelector;
// 对象是否支持weak
- (BOOL)allowsWeakReference UNAVAILABLE_ATTRIBUTE;
// 对象是否支持retain，weak
- (BOOL)retainWeakReference UNAVAILABLE_ATTRIBUTE;
// 是否为该类的子类
+ (BOOL)isSubclassOfClass:(Class)aClass;
// 当执行不存在的类方法时，调用该方法，默认返回NO，加上自己的处理后可返回YES
+ (BOOL)resolveClassMethod:(SEL)sel;
// 同上，但该方法为雷芳法
+ (BOOL)resolveInstanceMethod:(SEL)sel;
// hash值
+ (NSUInteger)hash;
// 方法调用者的父类类名
+ (Class)superclass;
// 方法调用者的类名
+ (Class)class;
// 对象描述，可自己实现
+ (NSString *)description;
// 调试对象描述
+ (NSString *)debugDescription;
 
@end

协议

@protocol NSObject
 
- (BOOL)isEqual:(id)object;
@property (readonly) NSUInteger hash;
 
@property (readonly) Class superclass;
// 返回类名
- (Class)class;
// 是一个指针，地址指向当前类
- (instancetype)self;
// 单线程，等包含该函数的方法执行完后才执行指定的方法
- (id)performSelector:(SEL)aSelector;
// 同上
- (id)performSelector:(SEL)aSelector withObject:(id)object;
// 同上
- (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;
// 对象是否为代理
- (BOOL)isProxy;
// 对象是否为指定类
- (BOOL)isKindOfClass:(Class)aClass;
// 对象是否为成员类
- (BOOL)isMemberOfClass:(Class)aClass;
// 是否实现对应协议
- (BOOL)conformsToProtocol:(Protocol *)aProtocol;
// 是否需执行对应方法
- (BOOL)respondsToSelector:(SEL)aSelector;
// 
- (instancetype)retain OBJC_ARC_UNAVAILABLE;
// 
- (oneway void)release OBJC_ARC_UNAVAILABLE;
// 
- (instancetype)autorelease OBJC_ARC_UNAVAILABLE;
// 
- (NSUInteger)retainCount OBJC_ARC_UNAVAILABLE;
// 
- (struct _NSZone *)zone OBJC_ARC_UNAVAILABLE;
 
@property (readonly, copy) NSString *description;
@optional
@property (readonly, copy) NSString *debugDescription;
 
@end

望指正