如何将标签设置为 UIImageview 图像等于 iOS 中每个图像的数组索引？

Question

我是 iOS 开发的新手。我想设置标签 imageview 图像等于它在我的 Array 索引中的值，就像我的 Array Contain 50 image 链接一样，我将 imageview 设置为图像代码，如

for(int index=0; index < [self.imagesa count]; index++)
{
    NSDictionary *dict=[self.imagesa objectAtIndex:index];
    NSString *image=[dict valueForKey:@"link"];
    smallImage = [[UIImageView alloc] init];
    pageLabel=[[UILabel alloc]init];
    smallImage.tag=index;
    smallImage.bounds = CGRectMake(10, 10, self.scrollView.frame.size.width, self.scrollView.frame.size.width);
    smallImage.frame = CGRectMake(5+xOffset, 0, 50, 50);
    [smallImage sd_setImageWithURL:[NSURL URLWithString:image] placeholderImage:[UIImage imageNamed:@"1.png"]];
    [self.imageArray insertObject:smallImage atIndex:index];
    CGSize scrollViewSize=CGSizeMake(self.scrollView.frame.size.width*[self.imageArray count], self.scrollView.frame.size.height);
    [self.scrollView setContentSize:scrollViewSize];
    CALayer *borderLayer = [CALayer layer];
    CGRect borderFrame = CGRectMake(10, 10, (smallImage.frame.size.width), (smallImage.frame.size.height));
    [borderLayer setBackgroundColor:[[UIColor clearColor] CGColor]];
    [borderLayer setFrame:borderFrame];
    [borderLayer setCornerRadius:kCornerRadius];
    [borderLayer setBorderWidth:kBoarderWidth];
    [borderLayer setBorderColor:[[UIColor redColor] CGColor]];
    [smallImage.layer addSublayer:borderLayer];
    [self.scrollView addSubview:smallImage];
    [self.scrollView addSubview:pageLabel];
    [self.scrollView addSubview:[self.imageArray objectAtIndex:index]];
    xOffset += 60;
}

在这里我想就像我选择第 5 个图像然后它的标签也是 5 怎么可能？在这里我设置 imageview.tag=index 但它总是 Returen 作为我的数组计数值。请给我解决方案每个图像标签都等于它在数组中的索引。

请提前。

Answer 1

我改进了您的代码并添加了UIButton 作为点击区域：

self.imageArray = [[NSMutableArray alloc] init];

for(int index=0; index < [self.imagesa count]; index++){
    NSDictionary *dict=[self.imagesa objectAtIndex:index];
    NSString *imageString = [dict valueForKey:@"link"];

    UIImageView *smallImage = [[UIImageView alloc] init];
    smallImage.bounds = CGRectMake(10, 10, self.scrollView.frame.size.width, self.scrollView.frame.size.width);
    smallImage.frame = CGRectMake(5+(index*60), 0, 50, 50);
    [smallImage sd_setImageWithURL:[NSURL URLWithString:imageString] placeholderImage:[UIImage imageNamed:@"1.png"]];
    smallImage.layer.backgroundColor = [[UIColor clearColor] CGColor];
    smallImage.layer.cornerRadius = kCornerRadius;
    smallImage.layer.borderWidth = kBoarderWidth;
    smallImage.layer.borderColor = [[UIColor redColor] CGColor];
    [self.imageArray addObject:smallImage];
    [self.scrollView addSubview:smallImage];

    UIButton *clickArea = [UIButton buttonWithType:UIButtonTypeCustom];
    clickArea.frame = smallImage.frame;
    clickArea.tag = index;
    [clickArea addTarget:self action:@selector(clickAreaClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.scrollView addSubview:clickArea];
}

// Doesn't need to be in for-loop
CGSize scrollViewSize=CGSizeMake(self.scrollView.frame.size.width*[self.imageArray count], self.scrollView.frame.size.height);
[self.scrollView setContentSize:scrollViewSize];

并从UIButton获取标签点击：

- (void)clickAreaClicked:(UIButton*)sender
{
    NSLog(@"sender tag: %i", sender.tag );
}

我刚刚测试过它并且它有效。让我知道它是否适合你。

Answer 2

我假设您的 smallImage 变量是在该循环之外声明的？如果是这样，您只是每次都覆盖它并将 smallImage.tag=index 设置为当前索引，因此每次它被覆盖并插入到您的数组中时，它将始终是循环中的最后一个索引。

如果你想在你的 self.imagesa 数组中访问 UIImageView，你需要这样做

smallImage = (UIImageView*)self.imagesa[index] 

这将访问索引处的 UIImageView。 否则，如果您想每次都创建一个新的 UIImageView ，则需要这样做

UIImageView* smallImage = [[UIImageView alloc] init];

替换循环内的现有分配。

希望这会有所帮助。

Answer 3

您需要添加按钮到滚动视图并为其设置标签..

for(int index=0; index < [self.imagesa count]; index++)
{
    NSDictionary *dict=[self.imagesa objectAtIndex:index];
    NSString *image=[dict valueForKey:@"link"];
    smallImage = [[UIImageView alloc] init];
    imageButton =[UIButton buttonWithType:UIButtonTypeCustom];

    pageLabel=[[UILabel alloc]init];
    smallImage.tag=index;
    smallImage.bounds = CGRectMake(10, 10, self.scrollView.frame.size.width, self.scrollView.frame.size.width);
    smallImage.frame = CGRectMake(5+xOffset, 0, 50, 50);
    imageButton.frame=CGRectMake(5+xOffset, 0, 50, 50);
    imageButton.tag=index;
    [imageButton addTarget:self action:@selector(imageClicked:) forControlEvents:UIControlEventTouchUpInside];
    [smallImage sd_setImageWithURL:[NSURL URLWithString:image] placeholderImage:[UIImage imageNamed:@"1.png"]];
    [self.imageArray insertObject:smallImage atIndex:index];
    CGSize scrollViewSize=CGSizeMake(self.scrollView.frame.size.width*[self.imageArray count], self.scrollView.frame.size.height);
    [self.scrollView setContentSize:scrollViewSize];
    CALayer *borderLayer = [CALayer layer];
    CGRect borderFrame = CGRectMake(10, 10, (smallImage.frame.size.width), (smallImage.frame.size.height));
    [borderLayer setBackgroundColor:[[UIColor clearColor] CGColor]];
    [borderLayer setFrame:borderFrame];
    [borderLayer setCornerRadius:kCornerRadius];
    [borderLayer setBorderWidth:kBoarderWidth];
    [borderLayer setBorderColor:[[UIColor redColor] CGColor]];
    [smallImage.layer addSublayer:borderLayer];
    [self.scrollView addSubview:smallImage];
    [self.scrollView addSubview:imageButton];
    [self.scrollView addSubview:pageLabel];
    [self.scrollView addSubview:[self.imageArray objectAtIndex:index]];
    xOffset += 60;
}

//(或)

for(int index=0; index < [self.imagesa count]; index++)
{
    NSDictionary *dict=[self.imagesa objectAtIndex:index];
    NSString *image=[dict valueForKey:@"link"];
    smallImage = [[UIImageView alloc] init];
    pageLabel=[[UILabel alloc]init];
    smallImage.tag=index;
    smallImage.bounds = CGRectMake(10, 10, self.scrollView.frame.size.width, self.scrollView.frame.size.width);
    smallImage.frame = CGRectMake(5+xOffset, 0, 50, 50);
    [smallImage sd_setImageWithURL:[NSURL URLWithString:image] placeholderImage:[UIImage imageNamed:@"1.png"]];
    UITapGestureRecognizer *tapRecognizer =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                                action:@selector(handleSingleTap:)];
    [tapRecognizer setNumberOfTouchesRequired:1];

        [smallImage addGestureRecognizer:tapRecognizer];
    [self.imageArray insertObject:smallImage atIndex:index];
    CGSize scrollViewSize=CGSizeMake(self.scrollView.frame.size.width*[self.imageArray count], self.scrollView.frame.size.height);
    [self.scrollView setContentSize:scrollViewSize];
    CALayer *borderLayer = [CALayer layer];
    CGRect borderFrame = CGRectMake(10, 10, (smallImage.frame.size.width), (smallImage.frame.size.height));
    [borderLayer setBackgroundColor:[[UIColor clearColor] CGColor]];
    [borderLayer setFrame:borderFrame];
    [borderLayer setCornerRadius:kCornerRadius];
    [borderLayer setBorderWidth:kBoarderWidth];
    [borderLayer setBorderColor:[[UIColor redColor] CGColor]];
    [smallImage.layer addSublayer:borderLayer];
    [self.scrollView addSubview:smallImage];
    [self.scrollView addSubview:pageLabel];
    [self.scrollView addSubview:[self.imageArray objectAtIndex:index]];
    xOffset += 60;
}

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer
{
    UIImageView *currentimage = (UIImageView *)[recognizer view];
    NSLog(@"%d",currentimage.tag);
}

您可以在 imageClicked 按钮操作处获取标签..

希望对你有帮助...