从另一个类设置 BOOL 属性

发布于 2024-12-02 03:28:23 字数 672 浏览 0 评论 0原文

我可以知道如何将 BOOL 变量从一个类共享到另一个类吗？

这就是我正在尝试做的事情。我正在 SecondVC 处设置 FirstVC 的 BOOL 变量。当我尝试更改 BOOL 值时应用程序崩溃时，我在这里做错了什么。没有错误日志。

FirstVC.h

@interface FirstVC : UIViewController <UITextFieldDelegate>{
    BOOL pickUpAddressIsSet;

}

@property (nonatomic) BOOL pickUpAddressIsSet;
@end

FirstVC.m

@synthesize pickUpAddressIsSet;

secondaryVC.m

NSArray *viewControllers = [self.navigationController viewControllers];
FirstVC *firstVC = (FirstVC *)[viewControllers objectAtIndex:viewControllers.count - 2];
firstVC.pickUpAddressIsSet = YES; // tried TRUE & 1

原文

May I know how do I share a BOOL variable from one class to another class?

Here's what I am trying to do. I am setting the BOOL variable of FirstVC at SecondVC. What am I doing wrong here as the app crashes when I tried to change the BOOL value. With no error log.

FirstVC.h

@interface FirstVC : UIViewController <UITextFieldDelegate>{
    BOOL pickUpAddressIsSet;

}

@property (nonatomic) BOOL pickUpAddressIsSet;
@end

FirstVC.m

@synthesize pickUpAddressIsSet;

secondVC.m

NSArray *viewControllers = [self.navigationController viewControllers];
FirstVC *firstVC = (FirstVC *)[viewControllers objectAtIndex:viewControllers.count - 2];
firstVC.pickUpAddressIsSet = YES; // tried TRUE & 1

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七月上 2024-12-09 03:28:23

试试这个：

@property(nonatomic, assign, getter= isPickUpAddressIsSet) BOOL pickUpAddressIsSet;

它对我有用

Try this:

@property(nonatomic, assign, getter= isPickUpAddressIsSet) BOOL pickUpAddressIsSet;

It works for me

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大海や 2024-12-09 03:28:23

看起来 firstVC 实例实际上并不是 FirstVC 类型（类），这可以解释该错误。

尝试以下操作：

NSArray *viewControllers = [self.navigationController viewControllers];
id firstVC = [viewControllers objectAtIndex:viewControllers.count - 2];
NSLog(@"%@", [firstVC class]);

您在 NSLog 输出中看到什么类型的类？

It seems like the firstVC instance isn't actually of the type (class) FirstVC, that would explain the error.

Try the following:

NSArray *viewControllers = [self.navigationController viewControllers];
id firstVC = [viewControllers objectAtIndex:viewControllers.count - 2];
NSLog(@"%@", [firstVC class]);

What kind of class do you see in the NSLog output?

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