iOS-方形图片设置成圆形图片

                                                    

创建一个方形的button，添加方形的背景图片，设置显示为圆形

    self.view.backgroundColor=[UIColororangeColor];

    button=[UIButtonbuttonWithType:UIButtonTypeCustom];

    button.frame=CGRectMake(0,0, 200, 200);

    button.center=self.view.center;

     button.layer.cornerRadius=100;

  button.layer.masksToBounds=YES;

    button.backgroundColor=[UIColororangeColor];

    [buttonsetImage:[UIImageimageNamed:@"fang"]forState:UIControlStateNormal];

    [self.viewaddSubview:button];