refreshing UIView in iphone app

hii every one ,

in my iphone application am downloading a image(jpg) file from FTP & loading that to the footer of every screen,& am placing following code in viewDidLoad to assign the file to image variable

documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@"XML"];
  开发者_开发问答 documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@"Extras"];
   imgLogo.image = [UIImage imageWithContentsOfFile:[documentsDirectory stringByAppendingPathComponent:@"logo.jpg"]];

but image is not displaying when we open the screen for first time it will be loaded after reopening the same screen 2 ,3 times,,so i need to refresh the view ,,,how can i do that?? can any one help me,,,,thanx in advance

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Did u try

[myView setNeedsDisplay];

Quote from Apple docs:

By default, geometry changes to a view automatically redisplays the view without needing to invoke the drawRect: method. Therefore, you need to request that a view redraw only when the data or state used for drawing a view changes.In this case, send the view the setNeedsDisplay message. Any UIView objects marked as needing display are automatically redisplayed when the application returns to the run loop.

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This may be due to incomplete download Please write code to check whether the file exists at that location or not. Also you can append path in one line documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@"XML/Extras/Logo.jpg"];