//例如: UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(50,50,100,40); button.backgroundColor = [UIColor blueColor]; //关键语句 button.layer.cornerRadius = 2.0;//2.0是圆角的弧度,根据需求自己更改 button.layer.borderColor = [UICo…