去除TableView多余的线
tableview.tablefooterview = [[UIView alloc]init];
或
[tableView setTableFooterView:[[UIView alloc] initWithFrame:CGRectZero]];
或
[tableView setTableFooterView:[[UIView alloc] initWithFrame:CGRectZero]];
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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