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

Question

SGView 中的函数 circleOfButtons:buttonSize:radius:(下文)是从 ParentView 调用的，我希望 ParentView 在 ParentView 向 SGView 发送消息时定义 SGView 中的值。

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排列成一个圈，本质上是这样的

#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:

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

我的猜测是编译器需要在接口(interface)中声明。我正在处理 these tutorials试图决定接口(interface)文件应该是什么样子，虽然有 6 个 SO 问题可能已经回答了我的问题，但只有 this one有一个似乎模糊相关的例子。

这是我的接口(interface)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

谁能举个例子说明这个接口(interface)文件应该是什么样子的？谢谢。

更新

这里是SGView.h(修订版)

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

我也注意到if语句

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

改为

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

错误变为

No visible @interface for 'ParentView' declares the selector 'circleOfButtons:buttonSize:radius:'

以前是

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

Answer 1

你在打电话

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

应该是

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