iOS Tip4:

1.报错Method cannot be declared public because its parameter uses an internal type：

image.png

把方法前的public去掉即可。

2.Error与NSError的关系：

https://www.jianshu.com/p/a36047852ccc

3.HandyJSON的使用：

https://www.jianshu.com/p/e9d933ce7c74

4.报错The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions：

https://stackoverflow.com/questions/53743382/the-compiler-is-unable-to-type-check-this-expression-in-reasonable-time-try-bre