delay函数在新版xcode里不支持啊
DISPATCH_TIME_NOW
这里不支持“Can not convert value of type 'Int' to expected argument type 'dispatch_time_t'(aka 'UInt64')”
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DISPATCH_TIME_NOW
这里不支持“Can not convert value of type 'Int' to expected argument type 'dispatch_time_t'(aka 'UInt64')”
2017-03-22
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