Unity3d provides a class for local persistent storage and reading-PlayerPrefs. The working principle is simple. The data is saved in a file in the form of key-value pairs, and then the program can retrieve the last saved value according to this name.

PlayerPrefs class supports saving and reading data types, floating-point types, integer types and string types in 3.

The corresponding functions are:

SetInt()； Save integer data;

GetInt()； Reading the shaping data;

set float()； Save floating-point data;

GetFlost()； Reading floating-point data;

SetString()； Save string data;

GetString()； Reading string data;

The usage of these functions is basically the same. Set is used for saving and Get is used for reading. The PlayerPrefs class also provides playerprefs. deletekey (key: string) to delete the specified data; PlayerPrefs。 DeleteAll () deletes all keys; PlayerPrefs。 HasKey (key: string) method to judge whether data exists.