How to change the uilabel text when animate an uiimageview

Question

I had an UIimageview which animate images and I had a uilabel which describes about the image How to change the label content when we change the image

for (int i=0; i<[mutable_banner count]; i=i+3) 
        {
            NSLog(@"--------%d----------%@",i,[mutable_banner objectAtIndex:i]);
            addr = [mutable_banner objectAtIndex:i];
            addr = [addr stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
            data_banner = [NSData dataWithContentsOfURL:[NSURL URLWithString:addr ] ];
            img_banner = [[UIImage alloc] initWithData:data_banner];

            [images addObject:img_banner];  

        }   


        array = [[NSArray alloc] initWithArray:images];

         NSLog(@"-array-----%d",[array count]);

        imgview_banner = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10,364 ,164)];//364.164
       // [imgview_banner setImage:[UIImage imageWithData:data_banner ]];  

        imgview_banner.animationImages=images;
        imgview_banner.animationDuration=30.0f;
        [imgview_banner startAnimating ];
        [view_banner addSubview:imgview_banner];

Answer 1

正如我在您的代码中看到的那样，您正在使用UIImageView动画，动画持续时间为30.f秒，因此要在更改任何图像时更改UILabel文本，您需要将NSTimer设置为timeInterval设置动画，在计时器的目标函数中，您可以相应地更改标签文本，为此，您可能需要保持currentIndex以根据图像显示文本，并做一些良好的工作，它将为您提供帮助。

Answer 2

You can store description of all images in an NSArray with same order as you add images in array . For example, array[0]'s description in imageDescription[0] and likewise.

Then when you start image animation, along with that call this method

index = 0;
[NSTimer scheduledTimerWithTimeInterval:30.0f target:self selector:@selector(showDesc) userInfo:nil repeats:YES];
[imgview_banner startAnimating ];

Then define showDesc() method as shown below :

- (void)showDesc {
    self.label.text = imageDescription[index];
    index ++;
    if (index == array.count) {
        index = 0;
    }
}

Declare a variable index as global.