UIButton底影 [英] UIButton bottom shadow

问题描述

我有一个 UIButton ，这与标准iOS键盘字母按钮非常相似。

I have a UIButton which is very similar to the standard iOS keyboard alphabet button.

我不知道如何只为底层创建阴影，就像iOS一样。

I am not sure how to create a shadow only for the bottom layer like how iOS have done.

我使用下面的代码，但我看到所有方面都有阴影，而不仅仅是底部：

I use the below code, but I see a shadow on all the side, not just the bottom:

CALayer *buttonLayer = [[CALayer alloc] init];
buttonLayer.shadowColor = [UIColor grayColor].CGColor;
buttonLayer.shadowOffset = CGSizeMake(0.f,1.f);
buttonLayer.masksToBounds = NO;
buttonLayer.shadowOpacity = 1.f;

您能告诉我如何达到同样的效果。在此先感谢。

Can you please tell me how to achieve the same effect. Thanks in advance.

推荐答案

您可以混合使用cornerRadius和shadow属性。我在iOS 8上测试过它。

You can mix the cornerRadius and shadow properties. I tested it on iOS 8.

Objective-C：

[self.globeButton setImage:[UIImage imageNamed:@"Globe"] forState:UIControlStateNormal];
self.globeButton.backgroundColor = [UIColor colorWithRed:171 green:178 blue:186 alpha:1.0f];
// Shadow and Radius
self.globeButton.layer.shadowColor = [[UIColor colorWithRed:0 green:0 blue:0 alpha:0.25f] CGColor];
self.globeButton.layer.shadowOffset = CGSizeMake(0, 2.0f);
self.globeButton.layer.shadowOpacity = 1.0f;
self.globeButton.layer.shadowRadius = 0.0f;
self.globeButton.layer.masksToBounds = NO;
self.globeButton.layer.cornerRadius = 4.0f;

Swift：

globeButton.setImage(UIImage(named: "Globe"), forState: .Normal)
globeButton.backgroundColor = UIColor(red: 171, green: 178, blue: 186, alpha: 1.0)
// Shadow and Radius
globeButton.layer.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.25).CGColor
globeButton.layer.shadowOffset = CGSize(width: 0.0, height: 2.0)
globeButton.layer.shadowOpacity = 1.0
globeButton.layer.shadowRadius = 0.0
globeButton.layer.masksToBounds = false
globeButton.layer.cornerRadius = 4.0

结果：

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