objective-c - ***由于未捕获的异常 'NSInvalidArgumentException'而终止应用程序

Question

2015-07-03 22:13:37.230 Hyponerd [64413:2308636]加载了它的 View
2015-07-03 22:13:39.860 Hyponerd [64413:2308636]-[BNRHyposisView MySegmentedControlAction:]:无法识别的选择器已发送到实例0x7fcbd27623b0
2015-07-03 22:13:39.866 Hyponerd [64413:2308636] *由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因:'-[BNRHyposisView MySegmentedControlAction:]:无法识别的选择器已发送至实例0x7fcbd27623b0'
* 首先抛出调用堆栈:

这是什么意思？我一直在努力解决这四个小时
我的代码是:

    @implementation BNRHyponosisViewController

    -(void)loadView {
        //Create a view
        CGRect frame = [UIScreen mainScreen].bounds;
        _backgroundView = [[BNRHyposisView alloc]initWithFrame:frame];

    NSArray *colors = @[@"Red", @"Blue", @"Green"];

    UISegmentedControl *segmentedControl = [[UISegmentedControl alloc]initWithItems:colors];

    segmentedControl.frame = CGRectMake(40, 200, 250, 50);
    segmentedControl.backgroundColor = [UIColor blackColor];
    segmentedControl.selectedSegmentIndex = 1;
    [_backgroundView addSubview:segmentedControl];

    [segmentedControl addTarget:_backgroundView    action:@selector(MySegmentedControlAction:) forControlEvents:UIControlEventValueChanged];

    self.view = _backgroundView;

}
          -(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:  (NSBundle *)nibBundleOrNil {
              self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

       if (self) {
            self.tabBarItem.title = @"Hypnotize";

        UIImage *image = [UIImage imageNamed:@"Hypno.png"];

        self.tabBarItem.image = image;

    }   return self;
}
    -(void)viewDidLoad {
         [super viewDidLoad];
         NSLog(@"loaded its view");

}
    -(void)MySegmentedControlAction:(UISegmentedControl*)segment
{
        if (segment.selectedSegmentIndex == 0) {
        [_backgroundView setCircleColor:[UIColor redColor]];
        } else if (segment.selectedSegmentIndex == 1) {
        [_backgroundView setCircleColor:[UIColor greenColor]];
    } else if (segment.selectedSegmentIndex == 2) {
        [_backgroundView setCircleColor:[UIColor blueColor]];
    }

}

@end

Answer 1

显然，您是将事件发送到View而不是ViewController，请替换为

[segmentedControl addTarget:_backgroundView action:@selector(MySegmentedControlAction:) forControlEvents:UIControlEventValueChanged];

有了这个

[segmentedControl addTarget:self action:@selector(MySegmentedControlAction:) forControlEvents:UIControlEventValueChanged];

它应该工作