用NSInvocation来实现对象的任意方法的调用
- (int)sumABC {
SEL sel = @selector(sumWithA:B:C:);
NSMethodSignature *methodSignature = [self methodSignatureForSelector:sel];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
[invocation setSelector:sel];
[invocation setTarget:self];
int a = 1, b = 2, c = 3;
[invocation setArgument:&a atIndex:2];
[invocation setArgument:&b atIndex:3];
[invocation setArgument:&c atIndex:4];
[invocation invoke];
int sum;
[invocation getReturnValue:&sum];
NSLog(@"sum is %d", sum);
return sum;
}
- (int)sumWithA:(int)A B:(int)B C:(int)C {
return A + B + C;
}
