Swfit5 Kingfisher 5.4.0 手动导入支持iOS10以下（iOS8，iOS9）

Kingfisher 最新版本 支持Swift5，但pod要求iOS10以上，

为了支持swfit5, pod 导入的时 要求最低使用 iOS 10 的系统，作者给出理由是iOS10以下的客户太少，找不到任何理由去支持。太任性了 哈哈！相信仍旧给一部分iOS 开发造成肯定的困扰。所以我找到以下方案处理既支持swift5又支持iOS10以下的系统，就是本地导入源码，不通过pod形式。

1.首先先创立一个新的工程，通过pod 把最新的版本的Kingfisher下载下来，从Pods 文件夹 找到源码，而后将源码拖到一个新的工程中。

2.把源码进行以下的修改，而后运行就可。

// MemoryStorage.swfit  75行cleanTimer = .scheduledTimer(withTimeInterval: config.cleanInterval, repeats: true) { [weak self] _ in                guard let self = self else { return }                self.removeExpired()             }// 替换如下：     cleanTimer = Timer.init(timeInterval: config.cleanInterval, target: self, selector: #selector(removeExpiredFunc), userInfo: nil, repeats: true)          cleanTimer?.fire()  并且在该类增加一个方法 @objc func removeExpiredFunc()  {        self.removeExpired()      }             

// ImageModifier.swift  里面 96行return image.imageFlippedForRightToLeftLayoutDirection()  // 替换如下：if #available(iOS 9.0, *) {        return image.imageFlippedForRightToLeftLayoutDirection()      } else {        return image      }

// ImageView+Kingfisher.swift  343行view.centerXAnchor.constraint(                    equalTo: base.centerXAnchor, constant: newIndicator.centerOffset.x).isActive = true view.centerYAnchor.constraint(                    equalTo: base.centerYAnchor, constant: newIndicator.centerOffset.y).isActive = true// 替换如下： if #available(iOS 9.0, *) {                view.centerXAnchor.constraint(                  equalTo: base.centerXAnchor, constant: newIndicator.centerOffset.x).isActive = true                view.centerYAnchor.constraint(                  equalTo: base.centerYAnchor, constant: newIndicator.centerOffset.y).isActive = true              } else {                // Fallback on earlier versions                NSLayoutConstraint.activate([                  NSLayoutConstraint(item: self, attribute: .centerX, relatedBy: .equal, toItem: base, attribute: .centerX, multiplier: 1, constant: newIndicator.centerOffset.x),                  NSLayoutConstraint(item: self, attribute: .centerY, relatedBy: .equal, toItem: base, attribute: .centerY, multiplier: 1, constant: newIndicator.centerOffset.y),                                    ])              }

// Placeholder.swift 66行centerXAnchor.constraint(equalTo: imageView.centerXAnchor).isActive = true        centerYAnchor.constraint(equalTo: imageView.centerYAnchor).isActive = true        heightAnchor.constraint(equalTo: imageView.heightAnchor).isActive = true        widthAnchor.constraint(equalTo: imageView.widthAnchor).isActive = true// 替换入下:if #available(iOS 9.0, *) {        centerXAnchor.constraint(equalTo: imageView.centerXAnchor).isActive = true        centerYAnchor.constraint(equalTo: imageView.centerYAnchor).isActive = true        heightAnchor.constraint(equalTo: imageView.heightAnchor).isActive = true        widthAnchor.constraint(equalTo: imageView.widthAnchor).isActive = true      } else {        // Fallback on earlier versions        NSLayoutConstraint.activate([          NSLayoutConstraint(item: self, attribute: .centerX, relatedBy: .equal, toItem: imageView, attribute: .centerX, multiplier: 1, constant: 0),          NSLayoutConstraint(item: self, attribute: .centerY, relatedBy: .equal, toItem: imageView, attribute: .centerY, multiplier: 1, constant: 0),          NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: imageView, attribute: .height, multiplier: 1, constant: 0),          NSLayoutConstraint(item: self, attribute: .width, relatedBy: .equal, toItem: imageView, attribute: .width, multiplier: 1, constant: 0)          ])      }

// AnimatableImageView.swift 289行if displayLink.preferredFramesPerSecond == 0 {            duration = displayLink.duration        } else {            // Some devices (like iPad Pro 10.5) will have a different FPS.            duration = 1.0 / Double(displayLink.preferredFramesPerSecond)        }// 替换如下： if #available(iOS 10.0, *) {        if displayLink.preferredFramesPerSecond == 0 {          duration = displayLink.duration        } else {          // Some devices (like iPad Pro 10.5) will have a different FPS.          duration = 1.0 / Double(displayLink.preferredFramesPerSecond)        }      } else {        duration = displayLink.duration      }

PS:而后运行就可，有问题欢迎留言。