IOS中使用AlamofireImage加载网络图片（记录）

优点

• 使用简单，两行代码加载网络图片
• 自动缓存，加载过的图片，在没网络的时候仍然可以显示。
• 有一些常用的扩展，方便对图片进行操作。

导入

  //使用cocoapods导入
  pod 'AlamofireImage', '~> 3.3'

使用

真的非常简单，两行代码搞定（记得要 import AlamofireImage）

let imageView = UIImageView(frame: frame)
let url = URL(string: "https://httpbin.org/image/png")!
imageView.af_setImage(withURL: url)

设置默认图片：

let imageView = UIImageView(frame: frame)
let url = URL(string: "https://httpbin.org/image/png")!
let placeholderImage = UIImage(named: "placeholder")!
imageView.af_setImage(withURL: url, placeholderImage: placeholderImage)

对图片进行缩放：

let image = UIImage(named: "unicorn")!
let size = CGSize(width: 100.0, height: 100.0)
let scaledImage = image.af_imageScaled(to: size)
let aspectScaledToFitImage = image.af_imageAspectScaled(toFit: size)
let aspectScaledToFillImage = image.af_imageAspectScaled(toFill: size)

圆形图片：

let image = UIImage(named: "unicorn")!
let radius: CGFloat = 20.0
let roundedImage = image.af_imageRounded(withCornerRadius: radius)
let circularImage = image.af_imageRoundedIntoCircle()