IOS圆角+圆角边框

//圆角
if (isRounded) {
        imageView.layer.cornerRadius = 20.0;
        imageView.layer.masksToBounds = YES;  
    }
    //圆角边框
    if(isBorder){
        imageView.layer.borderWidth  = 3;  
        imageView.layer.borderColor= [[UIColor whiteColor] CGColor];
    }