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"];

}