如何在目标c中从静态方法调用非静态方法？ [英] How to call non static method from static method in objective c?

问题描述

我正在使用单例模式的类。我有静态方法。现在我想在静态方法中调用非静态方法。但是我无法调用它。请告诉我解决方法是什么。

I am having a class in which i am using singleton pattern.I have static method.Now i want call a non static method inside the static method.But i am not able to call it.Please tell me what is the solution.

#import "ThemeManager.h"

@implementation ThemeManager

+(ThemeManager *)sharedInstance
{
    NSLog(@"shared instance called");
    static ThemeManager *sharedInstance = nil;

    if (sharedInstance == nil)
    {
        sharedInstance = [[ThemeManager alloc] init];
    }
    [self getPref];//i get error at this line
    return sharedInstance;
}
-(void)getPref
{
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        NSString *themeName = [defaults objectForKey:@"theme"] ?: @"default";
        NSLog(@"theme name is %@",themeName);
        NSString *path = [[NSBundle mainBundle] pathForResource:themeName ofType:@"plist"];
        self.theme = [NSDictionary dictionaryWithContentsOfFile:path];



}
@end

推荐答案

[sharedInstance getPref]

非静态方法是实例方法。接收者必须是一个实例。在你的情况下，你想要使用的实例当然是你刚刚创建的sharedInstance。

non static methods are instance methods. the receiver must be an instance. in your case, the instance you want to use is of course the sharedInstance that you just created.

在一个类方法self中就是这个类本身。这就是你在该行上出错的原因，因为self不是该上下文中的实例。

inside a class method self is the class herself. that's why you get an error on that line, because self is not an instance in that context.

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