代理设计模式简单格式(备忘)

it2022-05-05  110

A控制器充当B控制器的代理:(B页面的数据反传给A页面进行数据的更新,一般A跳转到B的这种情况下需要使用代理方法)

B控制器.h文件中的代码如下:

#import <UIKit/UIKit.h> @protocol SearchDestinationDelegate <NSObject> - (void)searchDestinationWithLocation:(CLLocationCoordinate2D)secrchLocationCoordinate; @end @interface SearchDestinationVC : UIViewController @property (nonatomic, weak) id<SearchDestinationDelegate> searchLocationDelegate; @end

B控制器.m文件中的代码如下:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { if ([self.searchLocationDelegate respondsToSelector:@selector(searchDestinationWithLocation:)]) { [self.searchLocationDelegate searchDestinationWithLocation:self.endUserLocation]; } [self.navigationController popViewControllerAnimated:YES]; }

A页面需要实现相应的代理,和代理方法,.m文件中的代码如下

//跳转到B页面的时候,让A页面充当B页面的代理<SearchDestinationDelegate> SearchDestinationVC *searchVC = [[SearchDestinationVC alloc]init]; searchVC.searchLocationDelegate = self; [self.navigationController pushViewController:searchVC animated:NO]; //实现代理中的方法 -(void)searchDestinationWithLocation:(CLLocationCoordinate2D)secrchLocationCoordinate { //拿到B页面穿过来的数据,在A页面进行需要的设置 }

 

转载于:https://www.cnblogs.com/yipingios/p/5615443.html


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