自制框架中出现错误"No known class method for selector 'Hello:'"

Question

我正在为一家公司制作一个框架，已经完成了所有代码。现在我正在尝试将其打包成框架。作为测试，我创建了一个名为-(void)Hello:(NSString *)worldText;的方法。

当我尝试使用这段代码[CompanyMobile Hello:@"World"];在应用程序中调用它时，我得到了一个编译器错误，其中显示：

No known class method for selector 'Hello:'

我的框架中的.m文件如下：

#import "Hello.h"

@implementation Hello

- (id)init
{
    self = [super init];
    if (self) {
        // Initialization code here.
    }

    return self;
}

-(void)Hello:(NSString *)world {

}

@end

我框架里的 .h 文件如下：

#import <Foundation/Foundation.h>

@interface Hello : NSObject
-(void)Hello:(NSString *)world;
@end

我的应用程序中的.h文件。

//
//  FMWK_TESTViewController.h
//  FMWK TEST
//
//  Created by Sam on 6/15/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <companyMobile/Hello.h>
@interface FMWK_TESTViewController : UIViewController

@end

我的应用程序中的 .m 文件

//
//  FMWK_TESTViewController.m
//  FMWK TEST
//
//  Created by Sam Baumgarten on 6/15/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "FMWK_TESTViewController.h"

@implementation FMWK_TESTViewController

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [Badgeville Hello:@"Sam"];
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

@end

- Sam Baumgarten

Answer 1

你将Hello:定义为一个实例方法，但你正在向类发送Hello:。要定义一个类方法，需要编写+ (void)Hello:而不是- (void)Hello:。

- Chuck

Answer 2

请参考：https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html 回答你的问题，需要更改。

@interface Hello : NSObject
-(void)Hello:(NSString *)world;
@end 

到

@interface CompanyMobile : NSObject{
}
+(void)Hello:(NSString *)world;
@end

然后调用方法 [CompanyMobile Hello:@"world"];

- Tatvamasi