dispatch_group_wait(dispatchGroupHealth,DISPATCH_TIME_FOREVER) crashes on iPhone 5 floating point value can not be converted to Int because it is greater than Int.maxdispatch_group_wait(dispatchGroupHealth,DISPATC
阅读背景：
Iphone 5与IOS 8 DISPATCH_TIME_FOREVER崩溃，因为它大于Int.max
来源：互联网
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