V var NSEC_PER_SEC: UInt64 V var NSEC_PER_MSEC: UInt64 V var NSEC_PER_USEC: UInt64 V var DISPATCH_WALLTIME_NOW: UInt Wall Time Constants Dispatch Objects C DispatchObject E DispatchPredicate func dispatchPrecondition(condition() -> DispatchPredicate) Deprecated Deprecated Symbol...
dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, 3ull * NSEC_PER_SEC); 其中:ull 是C语言的数值字面量,是显式表明类型时使用的字符串(表示 ”unsigned long long “) 点进宏定义 USEC_PER_SEC :看到很多宏定义,在网上找了一下,感觉解释的怪怪的。索性自己解释一番 SEC 秒 PER 每 NSEC ...
V var NSEC_PER_MSEC: UInt64 V var NSEC_PER_USEC: UInt64 V var DISPATCH_WALLTIME_NOW: UInt Wall Time Constants Dispatch Objects C DispatchObject E DispatchPredicate func dispatchPrecondition(condition: @autoclosure () -> DispatchPredicate) Dispatch Objects Deprecated Deprecated Symbols...
V var NSEC_PER_MSEC: UInt64 V var NSEC_PER_USEC: UInt64 V var DISPATCH_WALLTIME_NOW: UInt Wall Time Constants Dispatch Objects C DispatchObject E DispatchPredicate func dispatchPrecondition(condition: @autoclosure () -> DispatchPredicate) Dispatch Objects Deprecated Deprecated Symbols...
NSEC_PER_MSEC iOS 4.0+ iPadOS 4.0+ macOS 10.7+ Mac Catalyst 13.0+ tvOS 9.0+ watchOS 2.0+ visionOS 1.0+ var NSEC_PER_MSEC: UInt64 { get } See Also Time Multiplier Constants var USEC_PER_SEC: UInt64 var NSEC_PER_SEC: UInt64 var NSEC_PER_USEC: UInt64 Current page is NSEC_PER_MS...