如何将参数传递到iOS中的视图？

问题描述

UIViewController *theController = [[HelpViewController alloc] initWithNibName:@"HelpView" bundle:nil];
[self.navigationController presentModalViewController:theController animated:TRUE];

这是我显示视图的代码。我知道我可以使用app委托变量，但它更简洁，我可以以某种方式传递参数，理想情况下使用枚举。这可能吗？

Here's my code for showing my view. I know I can use app delegate variables, but it would be neater is I could pass a parameter in somehow, ideally using an enum. Is this possible?

推荐答案

只需为HelpViewController创建一个新的init方法，然后从那里调用它的超级init方法......

Just create a new init method for your HelpViewController and then call its super init method from there...

在HelpViewController.h中

In HelpViewController.h

typedef enum
{
    PAGE1,
    PAGE2,
    PAGE3
} HelpPage;

@interface HelpViewController
{
    HelpPage helpPage;
    // ... other ivars
}

// ... other functions and properties

- (id)initWithNibName:(NSString*)nibName bundle:(NSBundle*)nibBundle onPage:(HelpPage)page;

@end

在HelpViewController.m中

In HelpViewController.m

- (id)initWithNibName:(NSString*)nibName bundle:(NSBundle*)nibBundle onPage:(HelpPage)page
{
    self = [super initWithNibName:nibName bundle:nibBundle];
    if(self == nil)
    {
        return nil;
    }

    // Initialise help page
    helpPage = page;
    // ... and/or do other things that depend on the value of page

    return self;
}

并致电：

UIViewController *theController = [[HelpViewController alloc] initWithNibName:@"HelpView" bundle:nil onPage:PAGE1];
[self.navigationController presentModalViewController:theController animated:YES];
[theController release];

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