iOS UITapGestureRecognizer 有时不工作

Question

有时不会调用选择器方法“tagClickAtIndex”。

UILabel* label = [[UILabel alloc] init];
label.userInteractionEnabled = YES;
UITapGestureRecognizer* tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tagClickAtIndex:)];
[label addGestureRecognizer:tapGesture];



-(void)tagClickAtIndex:(UITapGestureRecognizer*)gesture
{
    NSMutableDictionary *mutDict = [[[NSMutableDictionary alloc]initWithDictionary:[_tagArray objectAtIndex:gesture.view.tag]] mutableCopy];
    [mutDict setValue:[NSNumber numberWithLong:gesture.view.tag] forKey:@"index"];
    [self.delegate tagClickAtIndex:mutDict];
}

Answer 1

你忘了设置label的frame，所以它只定义了可点击区域

label.frame  =  CGRectMake(0,0,200,30)
[yourMainview addSubView:label]

如果需要可以设置

tapGesture.numberOfTapsRequired = 1;