#import <Foundation/Foundation.h>

@interface ClassA : NSObject{

    int _id1;

    int _id2;

    int _id3;

}

@property int _id1;

@property int _id2;

@property int _id3;

-(void) setId1:(int)id1 andId2:(int)id2 andId3:(int)id3;

-(void) doMethod1;

-(void) doMethod2;

-(void) doMethod3;

@end

@implementation ClassA

@synthesize _id1,_id2,_id3;

-(void) setId1:(int)id1 andId2:(int)id2 andId3:(int)id3{

    _id1 = id1;

    _id2 = id2;

    _id3 = id3;

}

-(void) doMethod1{

    NSLog(@"%i", self._id1);}

-(void) doMethod2{

    NSLog(@"%i", self._id2);}

-(void) doMethod3{

    NSLog(@"%i", self._id3);}

@end

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        Class class = NSClassFromString(@"ClassA"); //通过字符串获取CLASS

        NSLog(@"%@", [class className]); //打印class的名称，在oc中class是一个结构体

        NSObject *tmp;

        SEL sel1 = @selector(doMethod2); //SEL对应选择一个方法

        SEL sel2 = NSSelectorFromString(@"doMethod1");

        SEL sel3 = NSSelectorFromString(@"setId1:andId2:andId3:");

        tmp = [[class alloc]init];

        //判断实例中是否包含这个方法，类似的还有是否属于某一个类等接口

        if([tmp respondsToSelector:sel3] == YES) {

　　　　　　  //oc中反射的基本函数performSelector不支持传入基本参数，如int，以及多个参数，解决的方法有很多种，
            //比如可以在设计中就将参数进行封装，下面这个方法是通过NSInvocation传入参数；

            NSInvocation *inv = [NSInvocation invocationWithMethodSignature:

                                 [tmp methodSignatureForSelector:sel3]];

            [inv setSelector:sel3];

            [inv setTarget:tmp];

            //arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation

            int input1 = ;

            int input2 = ;

            int input3 = ;

            [inv setArgument:&(input1)  atIndex:]; //第一个参数传入

            [inv setArgument:&(input2)  atIndex:]; //第二个参数传入

            [inv setArgument:&(input3)  atIndex:]; //第三个参数传入

            [inv invoke];

        }

        [tmp performSelector:sel1 withObject:nil]; //执行该方法

        if([tmp　respondsToSelector:sel2] == YES) {

            [tmp performSelector:sel2 withObject:nil];

        }

    }

    return ;

}