“在类方法中访问实例变量'xxx'.为什么? [英] "Instance variable 'xxx' accessed in class method....why?

问题描述

因此，请原谅我，因为我对stackoverflow和ios编程一般还很陌生.

So please forgive me as I am very new to stackoverflow and to ios programming in general.

我正在尝试更改我拥有的按钮的文本，用我从另一个类传入的日期字符串(dateStringForInput)替换当前文本.该按钮称为myTodayButton，并在我的.h文件中为我的类inputMilesViewController声明. @property (strong, nonatomic) IBOutlet UIButton *myTodayButton;

I am attempting to change the text of a button i have, replacing current text with a date string (dateStringForInput) I am passing in from another class. The button is called myTodayButton and is declared in my .h file for my class inputMilesViewController... @property (strong, nonatomic) IBOutlet UIButton *myTodayButton;

下面是我.m中的代码.

Below is the code from my .m.

+(void) changeButtonText:(NSString*) dateStringForInput{

     NSLog(@"we got to changebuttontext");
     [_myTodayButton setTitle:dateStringForInput forState:UIControlStateNormal];
}

在类方法中，我收到以下错误实例变量"_myTodayButton"".

I am getting the following error "Instance variable "_myTodayButton" accessed in class method.

我知道这是用类方法而不是实例方法编写的，但我不知道如何使此更改发生.提示此呼叫changeButtonText的按钮在另一个正在创建dateStringForInput的类中.

I understand that this is written in a class method rather than an instance method but i cant figure out how to get this change to happen. the button which prompts this call to changeButtonText is in the other class which is creating dateStringForInput.

推荐答案

像这样尝试...

用于(+)实例.

+ (void) changeButtonText:仅具有访问自身对象的权限.

+ (void) changeButtonText: Only have access to the self object.

-步骤1:从标题文件中删除以下行

@property (strong, nonatomic) IBOutlet UIButton *myTodayButton;

-步骤2:

• 在您的班级文件中全局添加UIButton *myTodayButton.
• 这意味着在@implementation
之前声明

• Add UIButton *myTodayButton in your class file globally..
• That means declare before @implementation

例如:在 .m文件

#import "Controller.h"
UIButton *myTodayButton // Add like this before @implementation

@implementation Controller

---

对于(-)实例

- (void) changeButtonText:仅具有访问实例方法的权限

- (void) changeButtonText: Only have access to the instance methods

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