IOS按需返回刷新数据

Posted 2020-11-19 心泪无恒

问题描述

相信大家都会遇到过这种情况： 
进入下一页面，并且在下一页面执行某一动作，返回要刷新，没有执行某一动作，返回不刷新。也就是当前页面要实现按照需求刷新页面

实现思路

在当前页面定义个Bool类型属性 isNeedRefresh，在viewWillAppear中进行判断是否需要刷新。在第二页面中重写返回按钮。 
通过 self.navigationController.viewControllers来获取上衣页面的ctl

实现代码

当前viewcontroller

@property (nonatomic, assign) BOOL isNeedRefresh;//是否需要刷新

- (void)viewWillAppear:(BOOL)animated{


    [super viewWillAppear:animated];

    if (self.isNeedRefresh) {

        NSLog(@"执行刷新了");

        [self loadData];
    }

}

#pragma mark 重写返回按钮
- (void)LeftBtnClicked:(UIButton *)sender{

    [self.view endEditing:YES];
    [NSObject cancelPreviousPerformRequestsWithTarget:self];


    UIViewController *ctl = self.navigationController.viewControllers[self.navigationController.viewControllers.count - 2];

    if ([ctl isKindOfClass:[AddServiceViewController class]]) {

        AddServiceViewController * ctl2 = (AddServiceViewController*)ctl;

        ctl2.isNeedRefresh = YES;

        [self.navigationController popToViewController:ctl2 animated:YES];

    }else{

         [self.navigationController popViewControllerAnimated:YES];
    }

}