iOS 指定圆角个数

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(72, 91, 115, 66)];
        
        UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imgView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(8, 8)];
        CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
        maskLayer.frame = imgView.bounds;
        maskLayer.path = maskPath.CGPath;
        imgView.layer.mask = maskLayer;