如何在目标c中使用用户点击手势获取标签标签

Question

我怎样才能从标签循环中获取哪个标签正在被点击。我在一个循环中有 4 个标签，如果我点击标签为 3 的标签，我应该让另一个标签出现在已经隐藏的视图上，我怎样才能得到这个？

CGFloat y1 = 100.0;
CGFloat x1 = 30.0;
CGRect rect1 = CGRectMake(x1, y1, 100, 30);
for (int i = 0; i < 4; i++)
{

label = [[UILabel alloc] initWithFrame:rect1];
label.tag = 4+i;
label.textAlignment = NSTextAlignmentCenter;
label.backgroundColor = [UIColor blueColor];
label.textColor = [UIColor whiteColor];
label.font = [UIFont fontWithName:@"Verdana-Bold" size:17.0];
    label.text = @"Hello";
    label.userInteractionEnabled = YES;

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gotTapped:)];
    [label addGestureRecognizer:tap];
[self.view addSubview:label];

    label2 = [[UILabel alloc] initWithFrame:CGRectMake(200, y1,  50, 30)];
    label2.tag = 100+i;
    label2.textAlignment = NSTextAlignmentCenter;
    label2.backgroundColor = [UIColor yellowColor];
    label2.textColor = [UIColor whiteColor];
    label2.font = [UIFont fontWithName:@"Verdana-Bold" size:17.0];
    label2.text = @"World";
     label2.hidden = YES;
    [self.view addSubview:label2];
    rect1.origin.y += 45;
}

}

   -(void)gotTapped:(UITapGestureRecognizer*)sender {
   for (UILabel *v in label2) {
    v.hidden = !v.hidden;
   switch(((UITapGestureRecognizer *)sender).view.tag)
        {
            case 1:
                NSLog(@"Clicked on label 1");
                break;
            case 2:
                NSLog(@"Clicked on label 2");
                break;

}

Answer 1

更新答案。

你在你的代码中做了一些错误的坐标检查它的标签2：

y1=y1+45;// extra line u need to add




CGFloat y1 = 40;
CGFloat x1 = 30.0;
CGRect rect1 = CGRectMake(x1, y1, 100, 30);

for (int i = 0; i < 4; i++)
{

    label = [[UILabel alloc] initWithFrame:rect1];
    label.tag = i+1;
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor = [UIColor blueColor];
    label.textColor = [UIColor whiteColor];
    label.font = [UIFont fontWithName:@"Verdana-Bold" size:17.0];
    label.text = @"Hello";
    label.userInteractionEnabled = YES;

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gotTapped:)];
    [label addGestureRecognizer:tap];
    [self.view addSubview:label];

    label2 = [[UILabel alloc] initWithFrame:CGRectMake(150, y1,  50, 30)];

    label2.tag = i+100;
    label2.textAlignment = NSTextAlignmentCenter;
    label2.backgroundColor = [UIColor redColor];
    label2.textColor = [UIColor whiteColor];
    label2.font = [UIFont fontWithName:@"Verdana-Bold" size:8];
    label2.text = [NSString stringWithFormat:@"%@%ld",@"world",(long)label2.tag];
    label2.hidden = YES;
    [self.view addSubview:label2];
    rect1.origin.y += 45;
    y1=y1+45;

    NSLog(@"tag values of label2 are %ld",label2.tag);

}

// UITapGestureRecognizer 操作

-(void)gotTapped:(UITapGestureRecognizer*)sender {


    NSLog(@"%ld",(((UITapGestureRecognizer *)sender).view.tag));

    int num= 99 +(int)(((UITapGestureRecognizer *)sender).view.tag);
    NSLog(@"%d",num);

    UILabel *label3 = [self.view viewWithTag:num];
    label3.hidden = NO;


           switch(((UITapGestureRecognizer *)sender).view.tag)
        {
            case 1:
                NSLog(@"Clicked on label 1");



                break;
            case 2:
                NSLog(@"Clicked on label 2");
                NSLog(@"%ld",100 +((UITapGestureRecognizer *)sender).view.tag) ;

                break;
            case 3:
                NSLog(@"Clicked on label 3");
                NSLog(@"%ld",100 +((UITapGestureRecognizer *)sender).view.tag) ;

                break;
            case 4:
                NSLog(@"Clicked on label 4");
                NSLog(@"%ld",100 +((UITapGestureRecognizer *)sender).view.tag) ;

                break;

        }
}