UIView *aView = [[UIView alloc] init];        aView.frame = CGRectMake(0, 0, 300, 200);    aView.backgroundColor = [UIColor redColor];        //設置圓角邊框        aView.layer.cornerRadius = 8;        aView.layer.masksToBounds = YES;        //設置邊框及邊框顏色        aView.layer.borderWidth = 8;        aView.layer.borderColor =[ [UIColor grayColor] CGColor];        [self.view addSubview:aView];

    UIView *aView = [[UIView alloc] init];        aView.frame = CGRectMake(0, 0, 300, 200);    aView.backgroundColor = [UIColor redColor];        [self.view addSubview:aView];        //設置所需的圓角位置以及大小    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:aView.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(10, 10)];    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];    maskLayer.frame = aView.bounds;    maskLayer.path = maskPath.CGPath;    aView.layer.mask = maskLayer;

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {    UIRectCornerTopLeft     = 1 << 0,    UIRectCornerToPRight    = 1 << 1,    UIRectCornerBottomLeft  = 1 << 2,    UIRectCornerBottomRight = 1 << 3,    UIRectCornerAllCorners  = ~0UL};