before
if let careProviders = providerJSON["care_providers"] as? [AnyObject]
after
if let careProviders = providerJSON["care_providers" as NSString] as? [AnyObject]
参考：
http://stackoverflow.com/questions/32715160/xcode-7-strange-cast-error-that-refers-to-xcuielement
Cast from XCUIElement to unrelated type '[AnyObject]' always fails while fetching JSON
原文：http://www.cnblogs.com/qiutangfengmian/p/6724204.html