Are you suppose to access UIView from another thread?

A lot of UI events in my apps take place in another thread. So in my uivewcontroller, it catches a button click for example, it launches a NSThread with some parameter. The reason I decided to use a thread is because if the duration takes long the UI completely locks up. The thread then fetches for some result and access a pointer to a UIView (a UILabel for example) and update it's content.
Now, is this model correct? I'm running in cases where setting the UILabel.text from the thread sometimes work, sometimes doesnt. I'm not sure how to debug. If I change the thread call to a standard method call (which blocks until results are ready) the text is updated correctly.
Any hints?

http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/ThreadS afetySummary/chapter950_section2.html

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user5449747 wrote:
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Are you suppose to access UIView from another thread?

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