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
}