IOS高级开发～Runtime（一）

#import <Foundation/Foundation.h>

@interface CustomClass : NSObject

-(void)fun1;

@end

@interface CustomOtherClass : NSObject

-(void)fun2;

@end

#import "TestClass.h"
#import <objc/runtime.h>
@implementation TestClass

+ (BOOL)resolveInstanceMethod:(SEL)sel {
    Method exchangeM = class_getInstanceMethod([self class], @selector(eatWithPersonName:));
    //拿到IMP指针
    class_addMethod([self class], sel, class_getMethodImplementation(self, @selector(eatWithPersonName:)),method_getTypeEncoding(exchangeM));
    return YES;
}
- (void)eatWithPersonName:(NSString *)name {
    NSLog(@"Person %@ start eat ",name);
}
@end

/**

 对象拷贝

 */

-(void)copyObj{

    CustomClass *obj = [CustomClass new];

    NSLog(@"对象拷贝:%p",&obj);

    //完全是一个新的对象

    id objTest = object_copy(obj,sizeof(obj));

    NSLog(@"%p", &objTest);

    [objTest fun1];

}

/**

 对象释放

 */

-(void)objectDispose{

    CustomClass *obj = [CustomClass new];

    (void)(NSLog(@"---%ld",obj.retainCount)),

    object_dispose(obj);

    //(void)(NSLog(@"---%ld",obj.retainCount)),

    //[obj release];

    //NSLog(@"---%ld",obj.retainCount);

    //[obj fun1];

}

/**

 更改对象的类

 */

-(void)setClassTest{

    CustomClass *obj = [CustomClass new];

    [obj fun1];

    

    Class aclass = object_setClass(obj, [CustomOtherClass class]);

    //obj 对象的类被更改了    swap the isa to an isa

    NSLog(@"aClass:%@",NSStringFromClass(aclass));

    NSLog(@"obj class:%@",NSStringFromClass([obj class]));

    [obj fun2];

}

-(void)getClassTest{

    CustomClass *obj = [CustomClass new];

    Class alogClass = object_getClass(obj);

    NSLog(@"--get:%@",NSStringFromClass(alogClass));

}

/**

 获取对象的类名

 */

- (void) getClassName{

    

    CustomClass *obj = [CustomClass new];

    NSString *className = [NSString stringWithCString:object_getClassName(obj) encoding:NSUTF8StringEncoding];

    NSLog(@"className:%@",className);

}

/**

 动态给一个类添加方法

 */

- (void)oneParam{

    TestClass *instance = [[TestClass alloc]init];

    //方法添加

    [instance performSelector:@selector(eatWithPersonName:) withObject:@"mujin"];

}