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I am developing one iphone app using iOS 5. I want to implement the functionality like kindle app to download data from server as shown in following image

enter image description here

I have implemented the progress view on button. Nut when I scroll the table cell , progress is not synched with the current progress. When I scroll the table it shows progress as 0.0

Also how can I queue the request & start one after the previous request is complete ? How can I delete the particular request when user clicks on Cross button ?

Any kind of help is appreciated. Thanks.

iOSAppDev
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