如何处理动态创建的UIButtons

Question

我有一个UIViewController作为一种菜单。该菜单由多个盒/瓦片组成，这些盒子/瓦片是包含带有描述的UILabel的UIViews，链接到显示更多信息的另一个UIViewController的UIButton和链接到显示该应用的另一个区域的UIViewController的另一个UIButton。

目前有3个这样的盒子，但这个会增长。目前，我已经硬编码了每一个这样的：

- (void)drawProceduresBox 
{ 
self.viewProceduresBox = [[UIView alloc] initWithFrame:CGRectMake((_screenWidth * 0.05), (_screenHeight * 0.35), (_screenWidth * 0.9), (_screenHeight * 0.25))]; 
[_viewProceduresBox setBackgroundColor:[UIColor whiteColor]]; 
_viewProceduresBox.layer.borderWidth = 1.0f; 
_viewProceduresBox.layer.borderColor = [UIColor grayColor].CGColor; 

CGFloat boxHeight = _viewProceduresBox.frame.size.height; 
CGFloat boxWidth = _viewProceduresBox.frame.size.width; 

self.buttonShowProcedures = [[UIButton alloc] init]; 
[_buttonShowProcedures setFrame:CGRectMake((boxWidth * 0.8), (boxHeight * 0.4), (boxWidth * 0.1), (boxHeight * 0.2))]; 
[_buttonShowProcedures setBackgroundColor:[UIColor greenColor]]; 
[_buttonShowProcedures addTarget:self action:@selector(showProcedures) forControlEvents:UIControlEventTouchUpInside]; 

_buttonshowMoreInfo = [[appButton alloc] init]; 
[_buttonshowMoreInfo setFrame:CGRectMake((boxWidth * 0.6), (boxHeight * 0.6), (boxWidth * 0.1), (boxHeight * 0.2))]; 
[_buttonshowMoreInfo setBackgroundColor:[UIColor blueColor]]; 
[_buttonshowMoreInfo setWhatToShow:@"vetMed"]; 
[_buttonshowMoreInfo addTarget:self action:@selector(showMoreInfo:) forControlEvents:UIControlEventTouchUpInside]; 

[_viewProceduresBox addSubview:_buttonShowProcedures]; 

}

有可能是这些框10+，所以我就想办法来动态创建。这是我到目前为止已经试过：

-(void)drawBox:(NSString*)moduleName boxFrame:(CGRect)boxFrame labelDesc:(NSString*)labelDesc 
{ 

UIView *moduleInfoBox = [[UIView alloc] initWithFrame:boxFrame]; 
[moduleInfoBox setBackgroundColor:[UIColor purpleColor]]; 

CGFloat boxHeight = moduleInfoBox.frame.size.height; 
CGFloat boxWidth = moduleInfoBox.frame.size.width; 

UILabel *moduleLable = [[UILabel alloc] init]; 
[moduleLable setFrame:CGRectMake((boxWidth * 0.05), (boxHeight * 0.05), (boxWidth * 0.6), (boxHeight * 0.9))]; 
[moduleLable setBackgroundColor:[UIColor yellowColor]]; 
[moduleLable setText:labelDesc]; 

UIButton *showModuleButton = [[UIButton alloc] init]; 
[showModuleButton setFrame:CGRectMake((boxWidth * 0.8), (boxHeight * 0.15), (boxWidth * 0.1), (boxWidth * 0.2))]; 
[showModuleButton setBackgroundColor:[UIColor grayColor]]; 
[showModuleButton addTarget:self action:@selector(showModule:) forControlEvents:UIControlEventTouchUpInside]; 

UIButton *showMoreInfoButton = [[UIButton alloc] init]; 
[showMoreInfoButton setFrame:CGRectMake((boxWidth * 0.8), (boxHeight * 0.65), (boxWidth * 0.1), (boxWidth * 0.1))]; 
[showMoreInfoButton setBackgroundColor:[UIColor orangeColor]]; 
[showMoreInfoButton addTarget:self action:@selector(showMoreInfo:) forControlEvents:UIControlEventTouchUpInside]; 

[moduleInfoBox addSubview:moduleLable]; 
[moduleInfoBox addSubview:showModuleButton]; 
[moduleInfoBox addSubview:showMoreInfoButton]; 

_scrollHeight = _scrollHeight + (moduleInfoBox.frame.origin.y + moduleInfoBox.frame.size.height); 

[_scrollView addSubview:moduleInfoBox]; 


} 

，我会叫这样的方法（在这种情况下，三盒）：

CGRect formularyFrame = CGRectMake((_screenWidth * 0.05), (_screenHeight * 0.05), (_screenWidth * 0.9), (_screenHeight * 0.25)); 
CGRect proceduresFrame = CGRectMake((_screenWidth * 0.05), (_screenHeight * 0.35), (_screenWidth * 0.9), (_screenHeight * 0.25)); 
CGRect vetMedFrame = CGRectMake((_screenWidth * 0.05), (_screenHeight * 0.65), (_screenWidth * 0.9), (_screenHeight * 0.25)); 
[self drawBox:@"Formulary" boxFrame:formularyFrame labelDesc:@"Desc about formulary module"]; 
[self drawBox:@"Procedures" boxFrame:proceduresFrame labelDesc:@"Desc about procedures module"]; 
[self drawBox:@"VetMed" boxFrame:vetMedFrame labelDesc:@"Desc about vetMed module"]; 

我遇到的问题是动态生成的在这种情况下，UIButtons需要链接到相关的东西，UIViewControllers。每个按钮都有一个选择器，用于触发方法'showModule'和'showModuleInfo'。

在这些方法中，我该如何判断UIButton是否被按下，因此知道将哪个UIViewController推送到navigationController？基本上，我想沿着线的东西：

-(void)showModule:(NSString*)moduleToShow 
{ 
    [self.navigationController pushViewController:moduleToShow animated:NO]; 
} 

但据我所知，你可以不加参数“@选择”分配：

[_buttonshowMoreInfo addTarget:self action:@selector(showMoreInfo:) forControlEvents:UIControlEventTouchUpInside]; 

我该怎么办呢？

Answer 1

如果你想创建一个按钮和一个视图控制器类显示按钮自来水之间的映射，你有2种简单的选择：

1. 分配一个标签给每个按钮，并创建一个字典映射标签类（要么一个NSString或Class）：

   @property(nonatomic, strong) NSMutableDictionary *tagClassDic; 
   
   -(void)drawBox:(NSString*)moduleName boxFrame:(CGRect)boxFrame labelDesc:(NSString*)labelDesc buttonTag:(NSInteger)tag { 
       ... 
       showModuleButton.tag = tag; 
   } 
   
   -(void)showModule:(UIButton *)sender { 
       NSString *classStr = self.tagClassDic[@(sender.tag)]; 
       [self.navigationController pushViewController:[NSClassFromString(classStr) new] animated:NO]; 
       // or, if you decide to store classes in the dictionary: 
       [self.navigationController pushViewController:[self.tagClassDic[@(sender.tag)] new] animated:NO]; 
   } 
   
   ... 
   
   self.tagClassDic = [NSMutableDictionary dictionary]; 
   
   NSInteger firstTag = 1; 
   [self drawBox:@"Formulary" boxFrame:formularyFrame labelDesc:@"Desc about formulary module" buttonTag:firstTag]; 
   self.tagClassDic[@(firstTag)] = @"ViewController"; // or [ViewController class] 
   

2. 集相关联的对象（再次，一个字符串或一类）直接连接到第e钮对象：

   static const char *kViewControllerClassKey = "viewControllerClassKey"; 
   
   -(void)drawBox:(NSString*)moduleName boxFrame:(CGRect)boxFrame labelDesc:(NSString*)labelDesc viewControllerClassStr:(NSString*)classStr { 
       ... 
       objc_setAssociatedObject(showModuleButton, kViewControllerClassKey, classStr, OBJC_ASSOCIATION_COPY_NONATOMIC); 
   } 
   
   -(void)showModule:(UIButton *)sender { 
       NSString *classStr = objc_getAssociatedObject(sender, kViewControllerClassKey); 
       [self.navigationController pushViewController:[NSClassFromString(classStr) new] animated:NO]; 
   } 
   
   ... 
   
   [self drawBox:@"Formulary" boxFrame:formularyFrame labelDesc:@"Desc about formulary module" viewControllerClassStr:@"ViewController"]; 
   

Answer 2

当您点击UIButton时，您调用的方法有点偏离。举例来说，现在您有：

// if a button action triggers this as your code is written, it won't have a valid string. 
-(void)showModule:(NSString*)moduleToShow 
{ 
    [self.navigationController pushViewController:moduleToShow animated:NO]; 
} 

这意味着，当你在按钮上敲击showModule:方法将收到NSString对象，但实际上它会收到UIButton对象触发事件。例如：

-(void)showModule:(UIButton *)sender 
{ 
    // use information about the button that sent the action 
} 

知道点击哪个按钮的常用方法是在创建按钮时在按钮上设置唯一标记。如果你只有几个，编写一个int就可以很好地工作 - 如果你有很多并且需要区分它们，你可能需要设置宏以便你可以命名你的int。

UIButton *showModuleButton = [[UIButton alloc] init]; 
... 
showModuleButton.tag = 1; 
[showModuleButton addTarget:self action:@selector(showModule:) forControlEvents:UIControlEventTouchUpInside]; 

现在，每当你“摸了内部”你的按钮，showModule:将被调用，并且它可以访问sender的tag属性，看看哪个按钮触发事件。

-(void)showModule:(UIButton *)sender 
{ 
    // use information about the button that sent the action 
    if(sender.tag == 1) 
    { 
     // you know which button triggered the event now! 
    } 
}