Question

我目前在SearchCategoryChooserViewController中有两个按钮。我想要做的是根据按下的按钮将chosenCategory属性设置为某个值，然后将该值发送到CriteriaViewController。

我在categoryButtonClick函数中注释了一些伪代码，但我不确定如何格式化语法，以及从哪里获取它。 topCategoryId1和topCategoryId2值来自SearchViewController。如果您希望我包含该类或任何其他类的代码，请告诉我。

SearchCategoryChooserViewController.m ：

#import "SearchCategoryChooserViewController.h"
#import "SearchViewController.h"
#import "CriteriaViewController.h"

@interface SearchCategoryChooserViewController ()

@end

@implementation SearchCategoryChooserViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];




    UIButton *category1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    category1.frame = CGRectMake(10, 120, 300, 35);
    [category1 setTitle: [NSString stringWithFormat:@"%@", self.topCategory1] forState:UIControlStateNormal];
    [category1 addTarget:self action:@selector(categoryButtonClick:)    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview: category1];


    UIButton *category2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    category2.frame = CGRectMake(10, 180, 300, 35);
    [category2 setTitle: [NSString stringWithFormat:@"%@", self.topCategory2] forState:UIControlStateNormal];
    [category2 addTarget:self action:@selector(categoryButtonClick:)    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview: category2];


}




- (IBAction)categoryButtonClick:(id)sender
{
//    if (topCategory1 button is pressed) {
//        set chosenCategory = self.topCategoryId1
//    }
//    
//    else if (topCategory2 button is pressed) {
//        set chosenCategory = self.topCategoryId2
//    }

}





- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


#pragma mark - Navigation

// Send the Category Id over to CriteriaViewController
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

 CriteriaViewController *controller = (CriteriaViewController *) segue.destinationViewController;

 // Send over the search query as well as the specific category to CriteriaVC to use
 controller.chosenCategory = self.topCategoryId1;



}


@end

Answer 1

你可以这样做：

- (IBAction)categoryButtonClick:(id)sender
{
    if ([topCategory1 isSelected]) {
        set chosenCategory = self.topCategoryId1
    }

    else if ([topCategory2 isSelected]) {
        set chosenCategory = self.topCategoryId2;
    }

}

Answer 2

一种可能的解决方案是使用标签。创建后，将每个按钮设置为自己的标记，例如：

UIButton *category1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
category1.frame = CGRectMake(10, 120, 300, 35);
[category1 setTitle: [NSString stringWithFormat:@"%@", self.topCategory1] forState:UIControlStateNormal];
[category1 addTarget:self action:@selector(categoryButtonClick:)    forControlEvents:UIControlEventTouchUpInside];
category1.tag = 1;  //added tag to button
[self.view addSubview: category1];


UIButton *category2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
category2.frame = CGRectMake(10, 180, 300, 35);
[category2 setTitle: [NSString stringWithFormat:@"%@", self.topCategory2] forState:UIControlStateNormal];
[category2 addTarget:self action:@selector(categoryButtonClick:)    forControlEvents:UIControlEventTouchUpInside];
category2.tag = 2;  //added tag to button
[self.view addSubview: category2];

然后在你的按钮操作方法（categoryButtonClick :)中，检查按钮的标签，如下所示：

- (IBAction)categoryButtonClick:(id)sender
{ UIButton *button = (UIButton *)sender;
  if(button.tag == 1){
        chosenCategory = self.topCategoryId1;
   }else{
        chosenCategory = self.topCategoryId2;
   }

}

Answer 3

根据@ croberth的回答，在有条件地设置chosenCategory后，发送performSegueWithIdentifier:sender:消息：

- (IBAction)categoryButtonClick:(id)sender
{
    UIButton *button = (UIButton *)sender;
    if(button.tag == 1) {
        chosenCategory = self.topCategoryId1;
    }
    else {
        chosenCategory = self.topCategoryId2;
    }

    [self performSegueWithIdentifier:@"YOUR_SEGUE_IDENTIFIER" sender:nil];
}

YOUR_SEGUE_IDENTIFIER是按钮和CriteriaViewController之间segue的标识符。由于您的按钮不在故事板中，因此它应该是两个控制器之间的一个区域，而不是任何按钮。

Answer 4

你所问的内容已经多次回答过了。您在prepareForSegue方法中的发送VC中设置变量，并准备一个变量以在接收VC中接收该值。这是一个包含更多细节的SO链接：ios pass values during a segue to another view

按下按钮时如何将值发送到ViewController

4 个答案: