有关iTunes Connect上面的图片上传问题
一定要将APP支持的所有设备尺寸的图片准备好，不然提交的时候会让补齐，不然无法提交。
Delegate
Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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