给UIImageview 添加边框 或者设置成圆角

//设置layer

    CALayer *layer=[backView layer];

    //是否设置边框以及是否可见

    [layer setMasksToBounds:YES];

    //设置边框圆角的弧度

    [layer setCornerRadius:10.0];

    //设置边框线的宽

    //

    [layer setBorderWidth:1];

    //设置边框线的颜色

    [layer setBorderColor:[[UIColor blackColor] CGColor]];

下面的代码是添加阴影的。

//给iamgeview添加阴影  和边框

UIImageView * imgvPhoto = [UIImageView alloc] init];

//添加边框

CALayer * layer = [_imgvPhoto layer];

layer.borderColor = [

    [UIColor whiteColor] CGColor];

layer.borderWidth = 5.0f;

//添加四个边阴影

_imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;

_imgvPhoto.layer.shadowOffset = CGSizeMake(0, 0);

_imgvPhoto.layer.shadowOpacity = 0.5;

_imgvPhoto.layer.shadowRadius = 10.0;给iamgeview添加阴影 < wbr > 和边框

//添加两个边阴影

_imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;

_imgvPhoto.layer.shadowOffset = CGSizeMake(4, 4);

_imgvPhoto.layer.shadowOpacity = 0.5;

_imgvPhoto.layer.shadowRadius = 2.0;

来源：http://hsany330.blog.163.com/blog/static/17681369201251533521597/