当作为参数iPhone/iPad传递时，无法执行方法

我试图学习如何将方法作为参数传递，然后在以后执行它们。在我的代码中，我有一个方法，当我试图将method1和method2传递给方法placeSlide时，单击按钮（最后一个方法）会调用get。我可以这样做，但当我试图执行它们时，我会出错。我做错了什么

-(void) method1{

}
-(void) method2{

}

-(void) placeSlide: (SEL) meth1 OtherMethod: (SEL) meth2{




    NSTimer *timer1;
    timer1 = [NSTimer scheduledTimerWithTimeInterval: (1)
                                             target: self
                                           selector: @selector(meth1)
                                           userInfo: nil
                                            repeats: NO];
    NSTimer *timer2;
    timer2 = [NSTimer scheduledTimerWithTimeInterval: (1.2)
                                             target: self
                                           selector: @selector(meth2)
                                           userInfo: nil
                                            repeats: NO];
}

// get's executed when I click on a btn
-(IBAction) ButtonClick{
    [self placeSlide:@selector(method1) OtherMethod:@selector(method2)];
}

我得到的错误是：

---

只需按原样传递

SEL

变量即可

NSTimer *timer1;
timer1 = [NSTimer scheduledTimerWithTimeInterval: (1)
                                         target: self
                                       selector: meth1
                                       userInfo: nil
                                        repeats: NO];
NSTimer *timer2;
timer2 = [NSTimer scheduledTimerWithTimeInterval: (1.2)
                                         target: self
                                       selector: meth2
                                       userInfo: nil
                                        repeats: NO];

---

只需按原样传递

SEL

变量即可

NSTimer *timer1;
timer1 = [NSTimer scheduledTimerWithTimeInterval: (1)
                                         target: self
                                       selector: meth1
                                       userInfo: nil
                                        repeats: NO];
NSTimer *timer2;
timer2 = [NSTimer scheduledTimerWithTimeInterval: (1.2)
                                         target: self
                                       selector: meth2
                                       userInfo: nil
                                        repeats: NO];