常量代表“从不".一个NSTimeInterval? [英] What constant represents "never" for an NSTimeInterval?

问题描述

NSTimeInterval 是一个 double ，因此它不能采用 nil ，并且0表示应立即发生的事情.是否存在一个常量，表示从不" ...或一个天文数字，或者我应该使用-1?

NSTimeInterval is a double, thus it cannot take a nil, and 0 represents something that should happen immediately. Is there a constant that means "never"... or an astronomically huge value, or should I use -1?

推荐答案

如s.bandara所建议，使用很大的数字将时间间隔视为无限"或从不".

As suggested by s.bandara, use a very large number to treat a time interval as "infinite" or "never".

DBL_MAX 是double可以容纳的最大值.此宏在 float.h 中声明:

DBL_MAX is the largest value a double can hold. This macro is declared in float.h:

#define DBL_MAX (9.999999999999999e999)

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