如何在不使用类名的情况下推送下一类而不是在iOS中使用NSString？

Question

我有很多类，例如Page1，Page2，Page3，Page4，Page5 ..............

我想编写一个方法转到下一个类，它将根据需要调用Page1,2,3。

这是我正在执行的代码：

 for (int j = 0; j<5; j++) {

    NSString *str_varForPage = [NSString stringWithFormat:@"%i", j];

    if ([txt_Chapter.text isEqualToString:str_Chapter] && [txt_Page.text isEqualToString:str_varForPage]) {

        NSString *Str_Page = @"Page";
        NSString *Str_NextPage = [NSString stringWithFormat:@"%@%@", Str_Page , str_varForPage];
        NSLog(@"Str_NextPage is: %@",Str_NextPage);


        Str_NextPage *nextclass= [[Str_NextPage alloc]initWithNibName:nil bundle:nil];       // error  Crash  , I want to call Page0 to Page4 classes here according to my need.
        [self.navigationController pushViewController:nextclass animated:YES];
    }

任何想法或建议都将受到欢迎。

Answer 1

您可以启动任何此类的对象。

NSString *nextPage = @"Page1";
Page1 *nextclassInstance = [[[NSClassFromString(nextPage) alloc]initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:nextclassInstance animated:YES];

Answer 2

使用如下代码片段：

Class someClassMetaClass = NSClassFromString(Str_Page);
[self.navigationController pushViewController:(UIViewController *)someClassMetaClass animated:YES];

Answer 3

//如果您想通过Storyboard切换特定的viewController，则可以这样使用：-

LargeImageView *largeImageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"LargeImageView"];

  [self.navigationController pushViewController:largeImageViewController animated:YES];

//如果要切换特定的viewController而不使用情节提要，则可以这样使用：-

MasterViewController *masterVC = [[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil];
    [self.navigationController pushViewController:masterVC animated:YES];

//如果要切换特定的类，可以这样使用：-

NSString *movePage = @"PageName";
Page0 *nxtPage = [[[NSClassFromString(movePage) alloc]initWithNibName:nil bundle:nil];
[self.navigationController:nxtPage animated:YES];