UIImage 切圆形图片方法

    //(1)创建image

    image=[[UIImageViewalloc]initWithFrame:CGRectMake(200, 200, 80, 80)];

    image.backgroundColor=[UIColorredColor];

    //(2)设置圆角

    image.layer.masksToBounds=YES;

    image.layer.cornerRadius=40;

    //(3)设置边框

    CALayer * layer = [imagelayer];

    layer.borderColor = [[UIColoryellowColor] CGColor];

    layer.borderWidth = 2.0f;

    //(4)显示在桌面

    [self.viewaddSubview:image];