let emptyArray = String[]() 时会提示“Array types are now written with the brackets around the element type”错误，正确的写法应该是let emptyArray = [String]() 其它类型类似来处理即可
Array types are now written with the brackets around the element type问题的解决方法
原文：http://blog.csdn.net/quanqinyang/article/details/40743507