Question

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];
}

Answer 1

你们需要继续跟踪这些阵列中的指数目前正在开始展示。

将图像Indexe变数添加到您的类别中,并初步改为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];
}

Answer 2

你们的期望

  [detailItem objectAtIndex:+1]

做些什么? 它将永远通过1个阵列中的第2个部分。如果你想要穿透阵列,你就必须在某个地方(例如,在财产中)保留指数,并加固该指数。

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