NSData *data = [[NSData alloc] initWithBase64EncodedString:@"TU1ZWVlZREQ=" options:NSDataBase64DecodingIgnoreUnknownCharacters]; NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:string]; // NSData *data1 = [[NSData alloc] initWithBase64EncodedString: @"MDEyMDIwMTA=" options:NSDataBase64DecodingIgnoreUnknownCharacters]; NSString *string1 = [[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding]; NSDate *dst_d = [formatter dateFromString:string1]; NSDate *cur_d = [NSDate date]; NSInteger ret = [cur_d timeIntervalSinceDate:dst_d]; NSLog(@"%ld", (long)ret); if (ret > 0){ return true; }
在iphone 6s上出现概率性闪退
错误日志显示
<Notice>: *** Terminating app due to uncaught exception ‘NSInvalidArgumentException‘, reason: ‘*** -[_NSPlaceholderData initWithBase64EncodedString:options:]: nil string argument‘
*** First throw call stack:
常量字符串为啥会为nil呢？ 很费解，求解释
去掉base64之后 发现
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"DDYYYYMM"]; NSDate *dst_d = [formatter dateFromString:@"14202001"];
得出来的结果。dst_d 的值是。
dst_d __NSTaggedDate * 2019-12-21 16:00:00 UTC 0xe41c1d73c8000000
不明白。非常之诡异
改成这样？
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"MMYYYYDD"]; NSDate *dst_d = [formatter dateFromString:@"01202014"];
正常了！！！
NSDate *cur_d = [NSDate date]; NSInteger ret = [cur_d timeIntervalSinceDate:dst_d]; NSLog(@"%ld", (long)ret); if (ret > 0){ return true; }
原文：https://www.cnblogs.com/lesten/p/12168278.html