原因/解决办法:iOS 的网络请求要求的安全性比较高都是https格式的,如果非要使用http格式的,就必须在info.plist文件中进行修改,允许使用安全性较低的http格式的,如下图在info.plist 中输入App Transport Security Settings ====>Allow Arbitrary Loads
iOS 发送HTTP请求报错:App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.