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这里有一篇文章,请阅读,感谢作者!http://blog.csdn.net/kmyhy/article/details/7733619当请求的网站有安全认证问题时,都需要通过[[challenge sender] useCredential:credential forAuthenticationChallenge:challenge]; 方法把相应的NSURLCredential对象注册到系统。 阅读全文
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想详细的了解网络下载的相关知识,要仔细阅读URL Loading System Programming Guide 这里有篇好文章(http://www.shinobicontrols.com/blog/posts/2013/09/20/ios7-day-by-day-day-1-nsurlsess 阅读全文
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In OS X v10.6 and later, operation queues use thelibdispatchlibrary (also known as Grand Central Dispatch) to initiate the execution of their operatio... 阅读全文