ios 如何为文本字段添加底部边框和侧面设计

我想添加底部边框，如下图所示，我已成功添加底线，但我没有得到侧面小线

这是我的代码

CALayer *border = [CALayer layer];
CGFloat borderWidth = 1;
border.borderColor = [UIColor lightGrayColor].CGColor;
border.frame = CGRectMake(0, textField.frame.size.height - borderWidth, textField.frame.size.width, textField.frame.size.height);
border.borderWidth = borderWidth;
[textField.layer addSublayer:border];
textField.layer.cornerRadius=30;
textField.layer.masksToBounds = YES;

您需要添加 3 个图层（底部、左侧和右侧）。检查下面的代码。

CALayer *bottomBorder = [CALayer layer], *leftBorder = [CALayer layer], *rightBorder = [CALayer layer];

CGFloat thickness = 1.0f;
CGFloat side_height = 6.0f;

leftBorder.frame = CGRectMake(0, textField.frame.size.height - side_height, thickness, textField.frame.size.height - 1);
rightBorder.frame = CGRectMake(textField.frame.size.width - 1, textField.frame.size.height - side_height, thickness, textField.frame.size.height - 1);
bottomBorder.frame = CGRectMake(0, textField.frame.size.height-1, textField.frame.size.width, thickness);

bottomBorder.backgroundColor = [UIColor lightGrayColor].CGColor;
leftBorder.backgroundColor = [UIColor lightGrayColor].CGColor;
rightBorder.backgroundColor = [UIColor lightGrayColor].CGColor;

[textField.layer addSublayer:bottomBorder];
[textField.layer addSublayer:leftBorder];
[textField.layer addSublayer:rightBorder];