用于从数组填充图像的按钮

发布于 2024-09-12 03:32:45 字数 320 浏览 5 评论 0原文

嘿伙计们，我有一个图像视图，带有弹出控制器。有一个名为Detailitem 的数组，它将图像加载到图像视图中。我想要的只是一个将数组中的下一个图像加载到图像视图中的按钮我该怎么写这个？这是我的尝试，它不起作用吗？

-(IBAction) nextitem {
    NSString * imageName = [NSString stringWithFormat:@"%@.jpg",[detailItem objectAtIndex:+1]];
    imageview.image = [UIImage imageNamed:imageName];
}

原文

Hey guys i have an image view, with a popover controller.
There is an array called detailitem which loads images into the image view.
All i want is a button to load next image in array into the image view
how would i write this?
Here is my attempt it doesn't work?

-(IBAction) nextitem {
    NSString * imageName = [NSString stringWithFormat:@"%@.jpg",[detailItem objectAtIndex:+1]];
    imageview.image = [UIImage imageNamed:imageName];
}

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你怎么敢 2024-09-19 03:32:45

您需要跟踪当前开始显示数组中的哪个索引。

将 imageIndex 实例变量添加到您的类中并将其初始化为 0

-(IBAction) nextitem {
    imageIndex++;
    if(imageIndex == [detailItem count]) imageIndex = 0; // don't overrun the end of the array
    NSString * imageName = [NSString stringWithFormat:@"%@.jpg",[detailItem objectAtIndex:imageIndex]];
    imageview.image = [UIImage imageNamed:imageName];
}

You need to keep track of which index in the array is currently begin displayed.

Add an imageIndex instance variable to your class and initialize it to 0

-(IBAction) nextitem {
    imageIndex++;
    if(imageIndex == [detailItem count]) imageIndex = 0; // don't overrun the end of the array
    NSString * imageName = [NSString stringWithFormat:@"%@.jpg",[detailItem objectAtIndex:imageIndex]];
    imageview.image = [UIImage imageNamed:imageName];
}

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來不及說愛妳 2024-09-19 03:32:45

什么

  [detailItem objectAtIndex:+1]

你期望做？它总是传递 1 并获取数组的第二个元素。如果要循环遍历数组，则需要在某处（例如在属性中）保留索引并递增它。

What do you expect

  [detailItem objectAtIndex:+1]

To do? It will always pass 1 and get the 2nd element of the array. If you want to loop through the array, you need to keep an index somewhere (in a property, for example) and increment it.

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