UIButton *Btn;

CGRect frame;       

 Btn = [[UIButton buttonWithType:UIButtonTypeCustom] retain]; //按钮的类型    

    [Btn setImage:[UIImage imageNamed:@“aaa.png”] forState:UIControlStateNormal];//设置按钮图片  

  Btn.tag = 10; 

   frame.size.width = 59;  //设置按钮的宽度  

  frame.size.height = 59;   //设置按钮的高度      

  frame.origin.x =150;   //设置按钮的位置     

   frame.origin.y =260;       

 [Btn setFrame:frame];     

   [Btn setBackgroundColor:[UIColor clearColor]];      

    [Btn addTarget:self action:@selector(btnPressed:)forControlEvents:UIControlEventTouchUpInside];   //按钮的单击事件     

   [self.view addSubview:Btn];      

    [Btn release];

-(void)btnPressed:(id)sender {

    //在这里实现按钮的单击事件

}