ios 自定义按钮

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
}