如何在视图控制器之间传递变量？ [英] How do I pass variables between view controllers?

问题描述

我有一个很难与Xcode;因为某些原因，它只是不允许我传递一个变量从一个视图控制器类到另一个。它应该工作，我基本上只是复制/粘贴从我的其他类（它适用于所有的...除了这一个）。

i'm having a hard time with Xcode; for some reason, it just won't let me pass a variable from one view controller class to another. It should work, i was basically just copying/pasting from my other classes (it works on all of them... except this one). I've been at it all night long, tried everything i could think of and still it remains.

这里是我打电话的视图控制器类：

Here's the view controller class where I'm making the call:

#import <UIKit/UIKit.h>
#import "Filme.h"
#import "Festival.h"
#import "Top10Discos.h"
#import "Peca.h"

@class DetalhesViewController;

@interface ResultadosViewController : UIViewController
{
    // Navegation
    DetalhesViewController *dvc;
    BOOL isViewPushed;

    // What i'd really like to pass lol
    NSArray *array_resultados;

}

@property (nonatomic, retain) NSArray *array_resultados;
@property (nonatomic, readwrite) BOOL isViewPushed;

@end*

ResultadosViewController.m：

>

ResultadosViewController.m:

#import "ResultadosViewController.h"
#import "DetalhesViewController.h"
#import "Filme.h"
#import "Peca.h"
#import "Top10Discos.h"
#import "Festival.h"

@implementation ResultadosViewController
@synthesize isViewPushed, array_resultados;

(...)

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic -- create and push a new view controller

    if (indexPath.row == 2)
    {
        if(dvc != nil)
            [dvc dealloc];

        NSString *ffs = [[array_resultados objectAtIndex:indexPath.row] TituloFilme];

        dvc = [[DetalhesViewController alloc] initWithNibName:@"DetailedView" bundle:[NSBundle mainBundle]];

        **resultadosControllerCell.array_resultados  = [self array_resultados];** 
        *"Request for member 'array_resultados' in something not a structure or union"*

        //Push the view controller to the top of the stack.
        [self.navigationController pushViewController:dvc animated:YES];

    }
}

发送数组到：

#import <UIKit/UIKit.h>

#import "Filme.h"
#import "Festival.h"
#import "Top10Discos.h"
#import "Peca.h"


@interface DetalhesViewController : UIViewController
{
    // Navegacao
    NSArray *array_resultados;

}

@property (nonatomic, retain) NSArray *array_resultados;
@end

我不确定是否有人会看到.m文件;

I'm not sure if any of you would to see the .m file for this class; in that case, just ask.

提前感谢，
Hal

Thanks in advance, Hal

其他变量（其他类型的），清理/重建，重新创建xib文件，你命名...我是outta技巧：（

PS: tried with other variables (other types too), cleansed/rebuilt, recreated xib file, you name it... i'm outta tricks :(

推荐答案

首先，不要使用 - > - 直接的实例变量访问它可能工作，但是你正在改变另一个对象的实例变量，

First off, don't use -> — that's direct instance-variable access. It may work, but you're changing another object's instance variables without its knowledge, which is just asking for trouble.

没有，Adam Rosenfield不是指 dvc-> array_resultados ;他的意思是 resultadosControllerCell-> array_resultados ，这是他说的，他是基于你说的。

And no, Adam Rosenfield didn't mean dvc->array_resultados; he meant resultadosControllerCell->array_resultados, which is what he said and which he based on what you said.

正确的解决方案是原始行和您对Adam的行的修订版本的混合：

The correct solution is a blend of your original line and your revision of Adam's line:

dvc.array_resultados = [self array_resultados];

这是通过你在 DetalhesViewController class。

This goes through the property you declared in the DetalhesViewController class.

说到这一点，你应该声明该属性为 copy ，而不是 retain 。否则，你会发现自己持有别人的mutable数组，然后他们会修改它 - 更糟糕的mojo。

Speaking of which, you should declare that property as copy, not retain. Otherwise, you'll find yourself holding somebody else's mutable array, which they will then modify—more bad mojo.

这篇关于如何在视图控制器之间传递变量？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！