调用stringWithFormat时长时间使用哪个正确的说明符? [英] which is the correct specifier to use for long when calling stringWithFormat?

问题描述

我有这段代码可以很好地工作，但是我不知道这是否是调用stringWithFormat的正确方法，因为在文档％d中，int是用于int的，并且我要传递很长的一段代码:

I have this code which works well but I don't know if it is the correct way to call stringWithFormat because in the documentation %d is for int and I'm passing a long:

    long seconds = (long)[[NSDate date]timeIntervalSince1970];
    NSString *unixTimestamp = [NSString stringWithFormat:@"date=%d", seconds];

提前谢谢！

推荐答案

尝试％ld :

 NSString *unixTimestamp = [NSString stringWithFormat:@"date=%ld", seconds];

来自 printf docs的摘要(NSString的stringWithFormat格式遵循相同的标准作为printf函数):

Abstract from printf docs (NSString's stringWithFormat format follows the same standard as printf function):

l(ell)
指定后续的d，i，o，u，x或X转换说明符适用于long或unsigned long参数

l (ell)
Specifies that a following d, i, o, u, x, or X conversion specifier applies to a long or unsigned long argument

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