ios - Objective-c 从类方法调用方法

Question

我正在尝试从类方法访问实例方法。我收到这个错误

+[ActiveVC goToDashBoard]: unrecognized selector sent to class 0x112010

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[ActiveVC goToDashBoard]: unrecognized selector sent to class 0x112010'

我的代码

+ (void) removeClosedVisitor:(NSString *) visitorID{

    for (NSInteger i = activelist.count - 1; i >= 0 ; i--) {
        ActiveItemObject *item = [activelist objectAtIndex:i];
        if ([visitorID isEqualToString:item.VisitorId]) {
            NSLog(@"Removing Visitor from Active List -- %@", visitorID);
            [activelist removeObjectAtIndex:i];
            //[self.incommingTable reloadData];

//            NSDictionary *activeDictionary = [[NSDictionary alloc] init];
//            activeDictionary = [activelist mutableCopy];
//            
//            [[NSNotificationCenter defaultCenter]
//             postNotificationName:@"PassData"
//             object:nil
//             userInfo:activeDictionary];

            [[self class] goToDashBoard];
        }
    }
}



- (void) goToDashBoard{
    NSLog(@"Segue to Dashboard");
    UITabBarController *dvc = [self.storyboard instantiateViewControllerWithIdentifier:@"id_tabView"];
    [dvc setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
    [self presentViewController:dvc animated:YES completion:nil];

}

谁能帮我解决这个问题。谢谢。

Answer 1

您需要创建类的实例或将类转换为单例。例如:[[ActiveVC sharedInstance] goToDashBoard];

创建单例类的方法如下:

首先，创建一个新文件并从 NSObject 继承它。随便命名，我们将在这里使用 CommonClass。 Xcode 现在将为您生成 CommonClass.h 和 CommonClass.m 文件。

在您的 CommonClass.h 文件中:

#import <Foundation/Foundation.h>

@interface CommonClass : NSObject {
}
+ (CommonClass *)sharedObject;
@property NSString *commonString;
@end

在您的 CommonClass.m 文件中:

#import "CommonClass.h"

@implementation CommonClass

+ (CommonClass *)sharedObject {
    static CommonClass *sharedClass = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedClass = [[self alloc] init];
    });
    return sharedClass;
}

- (id)init {
    if (self = [super init]) {
        self.commonString = @"this is string";
    }
    return self;
}

@end