问题
I am new one of using Grand central dispatch. I read the Apple documents about using GCD but still I have no idea about use this method. My thought is I have three type of upload buttons in my view and I clicked the button simultaneously I want to upload the data based on button action using NSURLCOnnection upload the content of data dispatch queue method.How can i do this. Pls help me
回答1:
Try reading Mike Ash's blog on grand central dispatch - it will give you a good idea of how to use its APIs in your own code. If his blog and Apple's docs are STILL not enough then I doubt that anyone on stackoverflow will be able to help you either since there's some conceptual hurdle that's not clear by your question.
The first three articles should help:
GCD Intro part 1 GCD Intro part 2 GCD Intro part 3
来源：https://stackoverflow.com/questions/12488855/using-dispatch-method-upload-the-data-based-on-button-action-in-iphone