OC runtime机制全面学习一下
// -------------------------------------------
// Myclass.h
#import <Foundation/Foundation.h>
@interface MyClass : NSObject<NSCopying,NSCoding>
@property (nonatomic,strong) NSArray *array;
@property (nonatomic, copy) NSString *string;
-(void) method1;
-(void) method2;
+(void) classMethod1;
@end
// -------------------------------------------
// Myclass.m
#import "MyClass.h"
@interface MyClass () {
NSInteger _instance1;
NSString * _instance2;
}
@property (nonatomic, assign) NSUInteger integer;
- (void)method3WithArg1:(NSInteger)arg1 arg2:(NSString *)arg2;
@end
@implementation MyClass
+ (void)classMethod1 {
}
- (void)method1 {
NSLog(@"call method method1");
}
- (void)method2 {
}
- (void)method3WithArg1:(NSInteger)arg1 arg2:(NSString *)arg2
{
NSLog(@"arg1 : %ld, arg2 : %@", arg1, arg2);
}
@end
//
// main.m
// runtime01
//
// Created by haogaoming on 2017/2/15.
// Copyright © 2017年 郝高明. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "MyClass.h"
#import <objc/runtime.h>
#import "MyClass+Tracking.h"
void TestMetaClass(id self, SEL _cmd) {
NSLog(@"this object is %p",self);
NSLog(@"Class id %@,super class is %@",[self class],[self superclass]);
Class currentClass = [self class];
for (int i=0; i<4; i++) {
NSLog(@"Following the isa pointer %d times gives %p",i,currentClass);
currentClass = objc_getClass((__bridge void *)currentClass);
}
NSLog(@"NSObject is class is %p",[NSObject class]);
NSLog(@"NSObject is meta class is %p",objc_getClass((__bridge void *)[NSObject class]));
}
void imp_submethod1(id self,SEL _cmd,NSNumber* index) {
NSLog(@"run sub method %ld",(long)index.integerValue);
}
int main(int argc, const char * argv[]) {
@autoreleasepool {
Class newClass = objc_allocateClassPair([NSError class], "TestClass", 0);
class_addMethod(newClass, @selector(testMetaClass), (IMP)TestMetaClass, "v@:");
objc_registerClassPair(newClass);
id instance = [[newClass alloc] initWithDomain:@"some domain" code:0 userInfo:nil];
[instance performSelector:@selector(testMetaClass)];
NSLog(@"=================== runtime对象实践 ============================");
// runtime对象实践
MyClass *myclass = [[MyClass alloc]init];
//[myclass description];
//[myclass performSelector:@selector(methodTest)];
unsigned int outCount = 0;
Class cls = myclass.class;
//类名
NSLog(@"class name is %s",class_getName(cls));
NSLog(@"=============================================");
//父类名字
NSLog(@"super calss name: %s",class_getName(class_getSuperclass(cls)));
NSLog(@"==============================================");
//是否是元类
NSLog(@"MyClass is %@ a meta-class",class_isMetaClass(cls) ? @"" : @"not");
NSLog(@"==============================================");
//获取元类
Class meta_class = objc_getMetaClass(class_getName(cls));
NSLog(@"%s's meta-class is %s",class_getName(cls),class_getName(meta_class));
NSLog(@"==============================================");
//变量实例大小
NSLog(@"instance size : %zu",class_getInstanceSize(cls));
NSLog(@"==============================================");
//打印成员变量
Ivar *ivars = class_copyIvarList(cls, &outCount);
for (int i=0; i<outCount; i++) {
Ivar ivar = ivars[i];
NSLog(@"instance variable's name : %s at index: %d",ivar_getName(ivar),i);
}
free(ivars);
NSLog(@"==============================================");
//获取指定的成员变量
Ivar string = class_getInstanceVariable(cls, "_string");
if (string != NULL) {
NSLog(@"instace variable %s",ivar_getName(string));
}
NSLog(@"==============================================");
//属性操作
objc_property_t *properties = class_copyPropertyList(cls, &outCount);
for (int i=0; i<outCount; i++) {
objc_property_t property = properties[i];
NSLog(@"property's name : %s",property_getName(property));
}
free(properties);
NSLog(@"==============================================");
//获取指定的属性
objc_property_t array = class_getProperty(cls, "array");
if (array != NULL) {
NSLog(@"property %s",property_getName(array));
}
NSLog(@"==============================================");
//方法操作
Method *methods = class_copyMethodList(cls, &outCount);
for (int i=0; i<outCount; i++) {
Method method = methods[i];
NSLog(@"method's signature : %s",method_getName(method));
}
free(methods);
NSLog(@"==============================================");
//获取实例方法
Method method1 = class_getInstanceMethod(cls, @selector(method1));
if (method1 != NULL) {
NSLog(@"method is : %s",method_getName(method1));
}
NSLog(@"==============================================");
//获取类方法
Method method2 = class_getClassMethod(cls, @selector(classMethod1));
if (method2) {
NSLog(@"class method is : %s",method_getName(method2));
}
NSLog(@"==============================================");
//打印方法的具体实现--查看方法的实现
IMP imp = class_getMethodImplementation(cls, @selector(method1));
imp();
NSLog(@"==============================================");
//协议
Protocol * __unsafe_unretained *protocols = class_copyProtocolList(cls, &outCount);
Protocol *protocol;
for (int i=0; i<outCount; i++) {
protocol = protocols[i];
NSLog(@"protocol name is : %s",protocol_getName(protocol));
}
NSLog(@"==============================================");
Class clss = objc_allocateClassPair(myclass.class, "MySubClass", 0);
//添加方法
class_addMethod(clss, @selector(method3), (IMP)imp_submethod1, "v@:");
//替换方法
class_replaceMethod(clss, @selector(method1), (IMP)imp_submethod1, "v@:");
//添加属性
//属性类型 name值：T value：变化
//编码类型 name值：C(copy) &(strong) W(weak) 空(assign) 等 value：无
//非/原子性 name值：空(atomic) N(Nonatomic) value：无
//变量名称 name值：V value：变化
objc_property_attribute_t type = {"T","@\"NSString\""};
objc_property_attribute_t ownership = {"C",""};
objc_property_attribute_t backingvar = {"N",""};
objc_property_attribute_t attrs[] = {type,ownership,backingvar};
class_addProperty(clss, "property2", attrs, 3);
objc_registerClassPair(clss);
id mySubClass = [[clss alloc] init];
[mySubClass performSelector:@selector(method3) withObject:@(123)];
[mySubClass performSelector:@selector(method1) withObject:@(321)];
objc_property_t *mysubClassIvar = class_copyPropertyList(clss, &outCount);
for (int i=0; i<outCount; i++) {
objc_property_t ivar = mysubClassIvar[i];
NSLog(@"MySubClass's property is : %s",property_getName(ivar));
}
free(mysubClassIvar);
NSLog(@"=========================================");
}
return 0;
}
运行结果为：
2017-01-22 19:41:37.452 RuntimeTest[3189:156810] class name: MyClass
2017-01-22 19:41:37.453 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.454 RuntimeTest[3189:156810] super class name: NSObject
2017-01-22 19:41:37.454 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.454 RuntimeTest[3189:156810] MyClass is not a meta-class
2017-01-22 19:41:37.454 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.454 RuntimeTest[3189:156810] MyClass's meta-class is MyClass
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] instance size: 48
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] instance variable's name: _instance1 at index: 0
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] instance variable's name: _instance2 at index: 1
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] instance variable's name: _array at index: 2
2017-01-22 19:41:37.455 RuntimeTest[3189:156810] instance variable's name: _string at index: 3
2017-01-22 19:41:37.463 RuntimeTest[3189:156810] instance variable's name: _integer at index: 4
2017-01-22 19:41:37.463 RuntimeTest[3189:156810] instace variable _string
2017-01-22 19:41:37.463 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.463 RuntimeTest[3189:156810] property's name: array
2017-01-22 19:41:37.463 RuntimeTest[3189:156810] property's name: string
2017-01-22 19:41:37.464 RuntimeTest[3189:156810] property's name: integer
2017-01-22 19:41:37.464 RuntimeTest[3189:156810] property array
2017-01-22 19:41:37.464 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.464 RuntimeTest[3189:156810] method's signature: method1
2017-01-22 19:41:37.464 RuntimeTest[3189:156810] method's signature: method2
2017-01-22 19:41:37.464 RuntimeTest[3189:156810] method's signature: method3WithArg1:arg2:
2017-01-22 19:41:37.465 RuntimeTest[3189:156810] method's signature: integer
2017-01-22 19:41:37.465 RuntimeTest[3189:156810] method's signature: setInteger:
2017-01-22 19:41:37.465 RuntimeTest[3189:156810] method's signature: array
2017-01-22 19:41:37.465 RuntimeTest[3189:156810] method's signature: string
2017-01-22 19:41:37.465 RuntimeTest[3189:156810] method's signature: setString:
2017-01-22 19:41:37.465 RuntimeTest[3189:156810] method's signature: setArray:
2017-01-22 19:41:37.466 RuntimeTest[3189:156810] method's signature: .cxx_destruct
2017-01-22 19:41:37.466 RuntimeTest[3189:156810] method method1
2017-01-22 19:41:37.466 RuntimeTest[3189:156810] class method : classMethod1
2017-01-22 19:41:37.466 RuntimeTest[3189:156810] MyClass is responsd to selector: method3WithArg1:arg2:
2017-01-22 19:41:37.467 RuntimeTest[3189:156810] call method method1
2017-01-22 19:41:37.467 RuntimeTest[3189:156810] ==========================================================
2017-01-22 19:41:37.467 RuntimeTest[3189:156810] protocol name: NSCopying
2017-01-22 19:41:37.467 RuntimeTest[3189:156810] protocol name: NSCoding
2017-01-22 19:41:37.467 RuntimeTest[3189:156810] MyClass is responsed to protocol NSCoding
2017-01-22 19:41:37.468 RuntimeTest[3189:156810] ==========================================================