extension DispatchQueue { /// 切换队列 /// /// - Parameter block: 代码块 public func safeAsync(_ block: @escaping () -> Void) { if self === DispatchQueue.main && Thread.isMainThread { block() } else { async { block() } } } } 乍一看,觉得这样写是不是没必要,其实不然,这样写...
在iOS8 之前其实我们可以自定义「取消」block 。 extensionDispatchQueue{typealiasTask=(_cancel:Bool)->Voidfuncdelay(_time:TimeInterval,task:@escaping()->())->Task?{funcdispatch_later(_block:@escaping()->()){lett=DispatchTime.now()+timeself.asyncAfter(deadline:t,execute:block)}varclosure:(()...
GCD文件擴展名有三種主文件類型,可以用General CADD Pro打開(由General CADD Products發布)。 總共有四種與此格式相關的軟體程式。 通常這些是一種Generic CADD Drawing File 格式。
If the file extension GCD is related to Prassi CD, the file is a disk image file type that contains data which is a duplicate disk image of data stored on a CD. The type of data will vary according to the program or application that created it. Prassi is a disk imaging software appli...
使用dispatch_apply串行队列并没有什么用,所以还是使用并行队列去吧。 4. 应用方法 直接使用dispatch_apply并发队列。这样会使用主线程处理一部分block。 完全使用子线程并发处理任务:在异步执行dispatch_asyn中使用dispatch_apply并发队列,注意并发队列不能是同一个,否则只会使用同一个线程顺序处理。
这时有几种方法可以供我们使用,来实现这种效果,下面对比总结一下。perform(_ aSelector: Selector, with anArgument: Any?, afterDelay delay: TimeInterval)extension NS ios 延时操作 swift 移动开发 swift API iOS 转载 索姆拉 2023-08-23 19:06:39...
GCDDavid TheoremGould's StarThe GCD Star of David Theorem and the numerous papers related to it have largely been devoted to showing the equality of the greatest common divisors of two sets of elements formed by partitioning various arrays of binomial coefficients for any location of these arrays...
Finally, in the last part of our paper, we show an extension of the numerical computation of the gcd to the problem of computing numerical rank of a Hankel matrix, which is a bottleneck of Padé and Berlekamp-Massey computations, having important applications to coding and transmission of ...
History The use of GCD as an extension ofOr, and its extension to complex rational numbers, was proposed byEugene McDonnellatAPL75.[1]Implemented bySHARP APLin 1980,[2]this definition has become common among many APLs, withDyalog APL(as ofversion 11.0),J,NARS2000,GNU APL,ngn/apl, anddza...
#if __has_feature(objc_fixed_enum) || __has_extension(cxx_strong_enums) #undef __QOS_ENUM #define __QOS_ENUM(name, type, ...) typedef enum : type { __VA_ARGS__ } name##_t #endif #endif #if __has_feature(enumerator_attributes) ...