文章目录
前言
iOS推出与退出界面有两种方式------push与present,接下来笔者分别介绍这两种方式
一、push方法
objectivec
SecondViewController *second = [[SecondViewController alloc] init];
[self.navigationController pushViewController:second animated:YES];
二、pop方法
objectivec
//返回上一级
[self.navigationController popViewControllerAnimated:YES];
//返回根视图
[self.navigationController popToRootViewControllerAnimated:YES];
//返回指定级数 (objectAtIndex:参数为想要返回的级数)
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
三、present方法
objectivec
SecondViewController *second = [[SecondViewController alloc] init];
[self presentViewController:second animated:YES completion:nil];
四、dismiss方法
objectivec
[self dismissViewControllerAnimated:YES completion:nil];
五、dismiss多级的方法
presentedViewController和presentingViewController是UIViewController里面的两个属性
PresentedViewController 与 PresentingViewController区别
presentedViewController:The view controller that was presented by thisview controller or its nearest ancestor. 由这个视图控制器或它最近的祖先呈现的视图控制器
presentingViewController:The view controller that presented this view
controller (or its farthest ancestor.) 呈现此视图控制器(或其最远祖先)的视图控制器。
假设从A控制器通过present的方式跳转到了B控制器,那么 A.presentedViewController 就是B控制器;B.presentingViewController 就是A控制器;
举例
创建四个页面ABCD,例如我们想从D->A,我们可以用如下方法:
objectivec
UIViewController *rootVC = self.presentingViewController;
while (rootVC. presentingViewController ) {
rootVC = rootVC.presentingViewController ;
}
[rootVC dismissViewControllerAnimated:YES completion:nil];
例如我们想从D->B,我们可以使用presenting来跳转页面
objectivec
[self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:nil];
如下代码也可以实现D->B
objectivec
UIViewController *rootVC = self.presentingViewController;
while (![rootVC isKindOfClass:[SecondViewController class]]) {
rootVC = rootVC.presentingViewController;
}
[rootVC dismissViewControllerAnimated:YES completion:nil];