利用performSelector 和NSInvocation来调用
相同点：父类都是NSObject不同点：performSelector最多传两个参数，使用比较简单
performSelector的方法以及部分使用方法
- (id)performSelector:(SEL)aSelector;
- (id)performSelector:(SEL)aSelector withObject:(id)object;
- (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;
NSInvocation使用方法
NSString *name = @"scott";
NSString *age = @"26";
NSString *sex = @"男";
NSMethodSignature *signture = [self methodSignatureForSelector:@selector(name:age:sex:)];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signture];
[invocation setTarget:self];
[invocation setSelector:@selector(name:age:sex:)];
[invocation setArgument:&name atIndex:1];
[invocation setArgument:&age atIndex:2];
[invocation setArgument:&sex atIndex:3];
[invocation invoke];
- (void)name:(NSString *)name age:(NSString *)age sex:(NSString *)sex{
NSLog(@"姓名：%@ 年龄 %@ 性别 %@",name,age,sex);
}
这里需要注意的是setArgument的index 我们的参数需要从2开始，1 2分别被self（target）,selector(_cmd)占据了
