1. The protocol defined in init? , Init! You can use init, init? , Init! To achieve.
init 2. defined in the agreement, you can use init, init! To achieve.
To be supplemented ......
1. The protocol defined in init? , Init! You can use init, init? , Init! To achieve.
init 2. defined in the agreement, you can use init, init! To achieve.
To be supplemented ......