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-(void)viewDidLayoutSubviews {          if ([self.mytableview respondsToSelector:@selector(setSeparatorInset:)]) {         [self.mytableview setSeparatorInset:UIEdgeInsetsZero];       }     if ([self.mytableview respondsToSelector:@selector(setLayoutMargins:)])  {         [self.mytableview setLayoutMargins:UIEdgeInsetsZero];     }   }   -(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPat{     if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {         [cell setLayoutMargins:UIEdgeInsetsZero];     }     if ([cell respondsToSelector:@selector(setSeparatorInset:)]){         [cell setSeparatorInset:UIEdgeInsetsZero];     } }

方法2:

使用UIAppearance,在程序开始的时候设置全局默认外观,不错的方法

 

 

 

 

 

Objective-C

 

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[[UITableView appearance] setSeparatorStyle:UITableViewCellSeparatorStyleSingleLine]; [[UITableView appearance] setSeparatorInset:UIEdgeInsetsZero]; [[UITableViewCell appearance] setSeparatorInset:UIEdgeInsetsZero];   if ([UITableView instancesRespondToSelector:@selector(setLayoutMargins:)]) {     [[UITableView appearance] setLayoutMargins:UIEdgeInsetsZero];     [[UITableViewCell appearance] setLayoutMargins:UIEdgeInsetsZero];     [[UITableViewCell appearance] setPreservesSuperviewLayoutMargins:NO]; }