iphone - 从 NSObject 类调用 presentModalViewController

Question

在我的 NSObject 子类中，我想调用类似的东西

    [[self navController] presentModalViewController:myView animated:YES];

但是我的尝试都没有成功。如果我不在 UIViewController 的子类中，如何调用模态视图？

解决方案:

#import "myProjectNameAppDelegate.h"
// ...
MyViewController *myView = [[MyViewController alloc] init];
myProjectNameAppDelegate *appDelegate = (myProjectNameAppDelegate *)[[UIApplication sharedApplication] delegate];
[[appDelegate navController] presentModalViewController:myView animated:YES];

Answer 1

调用 presentModalViewController 的更好方法是将 viewcontroller 传递给 NSobject 类。从 uiviewcontroller 调用 nsobject 函数这是带有邮件示例的代码

在 View Controller 中//你当前的 View

[nsobjectclassObject OpenMailComposer:self];//这会将viewcontroller带到NSobject类

在 NSObject 类中//可能是共享类

-(void)OpenMailComposer:(UIViewController*)view
{

    viewControllertoShow = view; // viewControllertoShow is UIVIewcontroller object
    MFMailComposeViewController *mailView = [[MFMailComposeViewController alloc]init];
    mailView.mailComposeDelegate = self;
    [mailView setSubject:@"Hey! check this out!"];
  [viewControllertoShow presentModalViewController:mailView animated:YES];
}

要从 NSObject 类 中解雇，您可以执行以下操作

[viewControllertoShow dismissViewControllerAnimated:YES]