iOS开发---UIButton 1 //创建一个可以显示图片的按钮。

//创建一个可以显示图片的按钮。
-(void)creatImageBtn{
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 100, 100);
    UIImage *icon1 = [UIImage imageNamed:@"icon1.png"];
    UIImage *icon2 = [UIImage imageNamed:@"icon2.png"];
    [btn setImage:icon1 forState:UIControlStateNormal];
    [btn setImage:icon2 forState:UIControlStateHighlighted];
    [self.view addSubview:btn];
}