objective-c - 从不同的类打开 ViewController

Question

我希望能够从不同的类打开一个 ViewController。所以我可以简单地调用它来在我需要的任何地方打开一个 View 。

所以我在保存代码的类中有这个设置:

---

+ (void)openCalcView: (NSString *)nameOfView {

UIViewController *controller;

if ([nameOfView isEqualToString:@"Tax"]) {

    controller = [[TAXViewController alloc]initWithNibName:@"TAXViewController" bundle:nil];


}else if ([nameOfView isEqualToString:@"Rent"]){

    controller = [[RENTViewController alloc]initWithNibName:@"RENTViewController" bundle:nil];

}

controller.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:controller animated:YES completion:nil];
[controller release];

}

---

但是 [self presentViewController:controller animated:YES completion:nil]; 给我一个警告:

未找到类方法“+presentViewController:animated:completion:”(返回类型默认为“id”)

我可以通过它从任何类调用简单的东西，比如 NSLog。但这不起作用。

Answer 1

因为 openCalcView 是一个类方法，所以没有 UIViewController 实例(即没有 [self presentViewController:] 方法)。

您还需要将 UIViewController 传递给此类方法，如下所示:

+ (void)openCalcView: (NSString *)nameOfView fromViewController:(UIViewController *)controller { 

    UIViewController *newController; 

    if ([nameOfView isEqualToString:@"Tax"]) { 

        newController= [[TAXViewController alloc]initWithNibName:@"TAXViewController" bundle:nil]; 


    }else if ([nameOfView isEqualToString:@"Rent"]){ 

        newController= [[RENTViewController alloc]initWithNibName:@"RENTViewController" bundle:nil]; 

    } 

    newController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
    [controller presentViewController:newController animated:YES completion:nil]; 
    [newController release]; 

} 

controller 参数表示正在打开新 View Controller 的 UIViewController