Top Posts Tagged with #main queue

Dispatch task to main queue, be careful!

Do you know the risk?

In this post, I bring up a topic which relates to Threading. If you are experienced in mobile development, you actually know about Multi-Thread, Main-Thread and Background Thread.

Let’s spend a few seconds to think of that. Have you used that properly? If you are not aware of what you did, then you should check this out.

I’m pretty sure that all of us have known that UI…

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#Breaking execution sequence #dispatch queue #iOS #main queue #main thread #objective-c #Swift #Threading

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How to invoke a block on the main thread

Sometimes you may want to process something on an NSOperation, providing a success/failure handler (i.e. block). If the operation is scheduled in a queue other than the main one, how do we call the handler on the main queue? Turns out, this is very easy: dispatch_async( dispatch_get_main_queue(), ^{ if (success) { successHandlerBlock(data, error); } else { failureHandlerBlock(nil, error); } }); This way we can neatly encapsulate computing operations or network connections in some proprietary queue while leaving the main queue free to handle I/O or UI-related operations.

#howto #block #main thread #main queue