IMP获取函数指针

Tester.h

#import <Foundation/Foundation.h>


@interface Tester : NSObject {
    
}

-(void) Test:(NSString*) msg;

@end

 

Tester.m

#import "Tester.h"


@implementation Tester

-(void) Test:(NSString*) msg
{
    NSLog(@"%@", msg);
        
}


@end

main.m

#import <Foundation/Foundation.h>
#import "Tester.h"

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

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    id tester = [[Tester alloc] init];
    
    SEL testSelector = @selector(Test:); //构造选择器
    IMP testIMP = [tester methodForSelector: testSelector];//获取函数的指针
    
    for(int i=0;i<10;i++)
    {
        //int to NSString
        //直接使用指针调用对像函数
        testIMP(tester,testSelector, [NSString stringWithFormat:@"%d",i]);
    }
                      

    [pool drain]; 
    return 0;
}