带边框和阴影的圆形按钮

Question

创建按钮（例如图像中的按钮）的最佳方法是什么？ 我试过：

            self.button.layer.shadowColor = UIColor.redColor.CGColor;
            self.button.layer.shadowRadius = 30.0f;
            self.button.layer.shadowOpacity = 1.0f;
            self.button.layer.shadowOffset = CGSizeMake(0.0f, 30.0f);
            self.button.clipsToBounds = NO;

            [self.button setNeedsDisplay];

但这只是添加了一个非常模糊的小阴影，与图像中完全不同。

Answer 1

嘿@user426132 设置 UIbutton 背景图像并尝试此代码

对于Objective-c

self.button.layer.cornerRadius = self.button.frame.size.width / 2;
self.button.layer.masksToBounds = false;
self.button.layer.shadowColor = UIColor.grayColor.CGColor;
self.button.layer.shadowOpacity = 1.0;
self.button.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
self.button.layer.shadowRadius = 10;
self.button.layer.shouldRasterize = true;
self.button.layer.rasterizationScale = UIScreen.mainScreen.scale;

对于Swift 4.2

    self.btnShadow.layer.cornerRadius =  self.btnShadow.frame.size.width / 2
    self.btnShadow.layer.masksToBounds = false
    self.btnShadow.layer.shadowColor = UIColor.black.cgColor
    self.btnShadow.layer.shadowOpacity = 1.0
    self.btnShadow.layer.shadowOffset = CGSize(width: 0, height: 0)
    self.btnShadow.layer.shadowRadius = 10
    self.btnShadow.layer.shouldRasterize = true
    self.btnShadow.layer.rasterizationScale = UIScreen.main.scale

输出在这里 黑色十字是图像