#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);}@endint main(int argc, const char * argv[]) {@autoreleasepool {Class class = NSClassFromString(@"ClassA"); //通过字符串获取CLASSNSLog(@"%@", [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 NSInvocationint input1 = 1;int input2 = 2;int input3 = 3;[inv setArgument:&(input1)  atIndex:2]; //第一个参数传入[inv setArgument:&(input2)  atIndex:3]; //第二个参数传入[inv setArgument:&(input3)  atIndex:4]; //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 0;
}