Ios UITapGestureRecognitor为零

我有一个表格，其中应将手势识别器添加到表格标题标签中。这是通过以下代码完成的：

    UITapGestureRecognizer *singleFingerTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(handleTableheaderTap:)];
    [headerView addGestureRecognizer:singleFingerTap];
    singleFingerTap.delegate = self;

选择器方法如下所示：

- (void)handleTableheaderTap:(UITapGestureRecognizer *)recognizer

不幸的是，调用该方法时，识别器为nil。我必须改变什么，使识别器在handletTableheaderTap中不再为零

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谢谢大家!

必须将实例存储在控制器属性中。 声明一个私有属性来存储它

例如：

@interface MyViewController()
@property (nonatomic, strong) UITapGestureRecognizer *singleFingerTap
@end

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您如何准确地确定“调用该方法时识别器为零”？-1的注释？

self.singleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(handleTableheaderTap:)];
 [headerView addGestureRecognizer:singleFingerTap];
  singleFingerTap.delegate = self;