Question

我的viewController中有一个containerView。我的viewController有一个UISegmentedControl。

如何在此时以及每次更改时选择此selectedSegmentIndex？

我'，尝试使用prepareForSegue在下一个类中的属性，但这只在第一次加载时发送.. 谢谢！

然后编辑我得到： - [ViewController containerViewDidChangeSegmentIndex：]：无法识别的选择器发送到实例0x7f8db16286d0

FirstViewController（包含一个select和一个containerView）

ViewController.h

    @interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UISegmentedControl *select;
@property (weak, nonatomic) IBOutlet UIView *container;

@property(nonatomic, assign) ContainerViewController * classLevelReference;

@end

ViewController.m

    @interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
     [_select addTarget:self action:@selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];
}

- (void)segmentChanged:(UISegmentedControl *)segment{
    //since you've reference to your container view here, you can directly call its method here:
    [self.classLevelReference containerViewDidChangeSegmentIndex:segment.selectedSegmentIndex];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    //don't forget to check the segue id, if you've multiple segues
    ContainerViewController *containerView = [segue destinationViewController];
    self.classLevelReference = self;
}

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

@end

ContainerViewController.h

@interface ContainerViewController : UIViewController

- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex;

@end

ContainerView.m

@implementation ContainerViewController

- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex{
    //Do whatever you want with your updated index
    NSLog(@"changing");
}

@end

Answer 1

您可能希望在ContainerViewController.h中创建一个方法，如下所示：

@interface ContainerViewController:UIViewController
//.....other implementation here.
- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex;
@end

现在在ContainerViewController.m中实现此方法，如下所示：

- (void)containerViewDidChangeSegmentIndex:(NSInteger)updatedIndex{
    //Do whatever you want with your updated index
}

现在，在准备segue时，请在类级变量中保存对ContainerViewController的引用：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    //don't forget to check the segue id, if you've multiple segues
    ContainerViewController *containerView = [segue destinationViewController];
    self.classLevelReference = containerView;
}

最后在FirstViewController.m中，告诉容器视图何时段索引发生变化。

- (void)viewDidLoad{
   //.....your other implementation here.....

   //add a listener to your segment's value changed action
   [youregements addTarget:self action:@selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];  
}

- (void)segmentChanged:(UISegmentedControl *)segment{
   //since you've reference to your container view here, you can directly call its method here:
   [self.classLevelReference containerViewDidChangeSegmentIndex:segment.selectedSegmentIndex];
}

重要提示：在您的案例中，ContainerViewController和FirstViewController可能有不同的名称，只需仔细应用更改。

快乐的编码！

如何在Objective-c中将selectedSegmentIndex发送到containerView？

1 个答案: