选择器 'circleOfButtons:buttonSize:radius:' 没有已知的类方法 [英] No known class method for selector 'circleOfButtons:buttonSize:radius:'

问题描述

SGView(下面)中的一个circleOfButtons:buttonSize:radius: 函数是从ParentView 和我调用的每当 ParentView 向 SGView 发送消息时，希望 ParentView 定义 SGView 内的值.

A function circleOfButtons:buttonSize:radius: in SGView (below) is called from ParentView and I want ParentView to define the values inside SGView whenever ParentView sends a message to SGView.

这是实现文件.

#import <UIKit/UIKit.h>
#import "ParentView.h"
#import "SGView.h"

@implementation ParentView : UIView

- (id)initWithFrame:(CGRect)frame {
    self                        = [super initWithFrame:[UIScreen mainScreen].bounds];
    if (self) {

    self.backgroundColor        = [UIColor lightGrayColor];

    int     count               = 5;
    CGFloat size                = 80.0;
    CGFloat radius              = 68;

    SGView *myView              = [SGView circleOfButtons:count buttonSize:size radius:radius];
    [self addSubview:myView];
    }
return self;
}

SGView 将多个 UIButton 排列成一个圆圈，本质上是这样的

SGView arranges multiple UIButtons in a circle and is essentially like this

#import "SGView.h"

@implementation SGView : UIView

+(id)circleOfButtons:(int)buttonCount buttonSize:(CGFloat)buttonSize circleRadius:(CGFloat)circleRadius
    {
    UIView *multipleViews       = [self new];

    // … circular geometry …
    [multipleViews addSubview:circleButton];
    }
    return multipleViews;
}
@end

错误消息 - 在 SGView *myView 行 - 是:

The error message - at the line SGView *myView - is:

没有已知的选择器类方法'circleOfButtons:buttonSize:radius:'

No known class method for selector 'circleOfButtons:buttonSize:radius:'

我的猜测是编译器想要在接口中声明.我正在研究这些教程，试图决定界面文件应该是什么样子，尽管有6 个可能已经回答了我的问题的 SO 问题，只有 这个 有一个似乎不太相关的例子.

My guess is the compiler wants a declaration in the interface. I’m working through these tutorials trying to decide what the interface file should look like and though there are 6 SO questions that may already have answered my question, only this one had an example that seemed vaguely relevant.

这是我的接口文件.

#import <UIKit/UIKit.h>
#import "ViewController.h"
#import "SGView.h"

@interface ParentView : UIView {
}

+(id)circleOfButtons:(int)buttonCount buttonSize:(CGFloat)buttonSize circleRadius:(CGFloat)circleRadius;

@end

谁能举一个例子来说明这个界面文件应该是什么样子?谢谢.

Can anyone please give an example showing what this interface file should look like ? Thanks.

更新

这里是SGView.h(修改)

#import <UIKit/UIKit.h>
@interface SGView : UIView {
}
+(id)circleOfButtons:(int)buttonCount buttonSize:(CGFloat)buttonSize circleRadius:(CGFloat)circleRadius;
@end

我也注意到如果声明

        SGView *myView              = [SGView circleOfButtons:count buttonSize:size radius:radius];

改为

        SGView *myView              = [self circleOfButtons:count buttonSize:size radius:radius];

错误更改为

ParentView"没有可见的@interface 声明了选择器circleOfButtons:buttonSize:radius:"

以前是

选择器 'circleOfButtons:buttonSize:radius:' 没有已知的类方法

No known class method for selector 'circleOfButtons:buttonSize:radius:'

推荐答案

您正在致电

  SGView *myView              = [SGView circleOfButtons:count buttonSize:size radius:radius];

应该是

SGView *myView              = [SGView circleOfButtons:count buttonSize:size circleRadius:radius];

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