Question

我怎么能这样做？

我有2个UIViews - 让我们称之为MainNavView和SubNavView。 MainNavView上有一组（6）个按钮。

让我们说用户点击MainNavView上的第一个按钮，它会将它们带到SubNavView，这个视图将有例如它上面有4个按钮。但是，如果他们点击MainNavView上的第二个按钮，它将把它们带到SubNavView，但只有例如这次有两个按钮。

因此，对于MainNav上的每个按钮，它将具有一个SubNavView，其上有不同数量的按钮。每个“SubNavView”的按钮数量都知道。

我对如何做到这一点有点困惑。我的所有按钮都连接到我的pushButton动作。然后根据按下的按钮，我创建了许多按钮并添加到NSMutableArray。

然后在prepareForSegue中，我想将此数组发送到SubNavView以使用按钮填充它。我是否朝着正确的方向前进？

以下是我在MainNavView.m中的内容。我使用switch-case中的代码来测试我是否可以在MainNavView的屏幕上绘制2个按钮（最初将代码添加到viewDidLoad），这样就可以了。

编辑* 好的看一些例子，我需要做的是在MainNavView上按下按钮的标签，然后根据MainNav按钮标签ID在SubNavView中的viewDidLoad上创建所有SubNav按钮？它是否正确？如果是这样，在SubNavView的viewDidLoad中，如何访问推送的按钮？在prepareForSegue的这一行上不确定。

[vc setSelectedButton:tagIndex];

在MainNavView.m中更新为代码如下：

-(IBAction)pushButton:(id)sender
{
    [self performSegueWithIdentifier:@"segueToSubNav" sender:sender];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"segueToSubNav"])
    {
        // Get reference to the destination view controller
        SubNavViewController *vc = [segue destinationViewController];

        // Get button tag number
        NSInteger tagIndex = [(UIButton *) sender tag];

        // Pass any objects to the destination view controller here
        //[vc setSelectedButton:tagIndex];
    }
}

enter code here

（下面的旧代码）

#import "ViewController.h"
#import "SubNavViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize buttons;
@synthesize myButton1, myButton2;

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

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

-(IBAction)pushButton:(id)sender
{
    int theTag = ((UIView *) sender).tag;

    switch (theTag)
    {
        case 1:
        {
            NSLog(@"Getting Here");

            buttons = [[NSMutableArray alloc] init];

            // Button 1
            myButton1 = [UIButton buttonWithType:UIButtonTypeCustom];
            myButton1.tag = 1;
            // X, y, width, height
            myButton1.frame = CGRectMake(60, 60, 100.f, 100.f);

            UIImage *buttonImage1 = [UIImage imageNamed:@"button.png"];
            [myButton1 setBackgroundImage:buttonImage1 forState:UIControlStateNormal];
            [self.view addSubview:myButton1];

            // Add targets and actions
            [myButton1 addTarget:self action:@selector(getButtons) forControlEvents:UIControlEventTouchUpOutside];
            myButton1.tag = 0;

            // Button 2
            myButton2 = [UIButton buttonWithType:UIButtonTypeCustom];
            myButton2.tag = 1;
            // X, y, width, height
            myButton2.frame = CGRectMake(160, 160, 100.f, 100.f);

            UIImage *buttonImage2 = [UIImage imageNamed:@"button.png"];
            [myButton2 setBackgroundImage:buttonImage2 forState:UIControlStateNormal];
            [self.view addSubview:myButton2];

            // Add targets and actions
            [myButton2 addTarget:self action:@selector(getButtons) forControlEvents:UIControlEventTouchUpOutside];
             myButton2.tag = 0;

            // Add to array
            [buttons addObject:myButton1];
            [buttons addObject:myButton2];

            break;
        }

        case 2:
            NSLog(@"Where to Stay");
            // Create buttons here 
            break;

        case 3:
            NSLog(@"Where to Eat");
            // Create buttons here 
            break;

        default:
            break;
    } 
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"segueToSubNav"])
    {
        // Get reference to the destination view controller
        SubNavViewController *vc = [segue destinationViewController];

        // Pass any objects to the view controller here, like...
        [vc setMyObjectHere:buttons];
    }
}
@end

Answer 1

您可以在property课程中添加SubNavView，其中会按住按钮的标记。然后，当您创建SubNavView的实例时，在显示该属性之前设置该属性。您还需要将所选标记保存在MainNavView的ivar中，以便在SubNavView中设置所选标记。

以下是一个例子：

<强> SubNavViewController.h

@interface SubNavViewController : UIViewController

@property (nonatomic, strong) NSInteger tagSelected;

// The rest of your class declaration

@end

<强> MainNavViewController.m

@interface MainNavViewController ()

// This is the ivar to save the selected tag
@property (nonatomic, strong) NSInteger tagSelected;

@end

@implementation MainNavViewController ()

// Your class code

-(IBAction)pushButton:(id)sender
{
    int theTag = ((UIView *) sender).tag;

    // save the tag that was selected for later use
    sefl.tagSelected = theTag; 

    switch (theTag)
    {
        // The rest of your switch here...
    }
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"segueToSubNav"])
    {
        // Get reference to the destination view controller
        SubNavViewController *vc = [segue destinationViewController];

        // Tell SubNavView which button was pressed...
        vc.selectedTag = self.selectedTag;

        // Pass any objects to the view controller here, like...
        [vc setMyObjectHere:buttons];
    }
}

@end

之后，当调用SubNavView的{{1}}时，您可以使用viewDidLoad子句创建按钮：

if-else

希望这有帮助！

添加随机数量的按钮进行查看

1 个答案: