enumerateObjectsUsingBlock 、for 、for(... in ...) 的区别 & 性能测试
doubledate_s =CFAbsoluteTimeGetCurrent();和NSDate*date = [NSDatedate];
NSTimeIntervaltime = [datetimeIntervalSinceReferenceDate];等价
参考的起始
enumerateObjectsUsingBlock 、for 、for(... in ...) 的区别 & 性能测试
doubledate_s =CFAbsoluteTimeGetCurrent();和NSDate*date = [NSDatedate];
NSTimeIntervaltime = [datetimeIntervalSinceReferenceDate];等价
参考的起始