ios - 如何将椭圆形图层绘制到 UITextField

Question

我需要将椭圆形绘制到我的文本字段，我不知道如何使用图层绘制，如果有人帮我设计这个阴影，

Answer 1

这是 Anton 回答的 Objective-C 翻译，因为问题被标记为 Objective-C 而不是 Swift:

CAShapeLayer *shadowLayer = [[CAShapeLayer alloc] init];
shadowLayer.fillColor = [UIColor lightGrayColor].CGColor;
shadowLayer.lineWidth = 0.0f;
CGSize shadowSize = CGSizeMake(textField.bounds.size.width + 40, 40);
CGRect shawdowBounds = CGRectMake(0, 0, shadowSize.width, shadowSize.height);
shadowLayer.path = [UIBezierPath bezierPathWithOvalInRect:shawdowBounds].CGPath;
shadowLayer.bounds = shawdowBounds;
shadowLayer.position = CGPointMake(CGRectGetMidX(textField.bounds), CGRectGetMaxY(textField.bounds));
[containerView.layer insertSublayer:shadowLayer atIndex0];