獲取當(dāng)前時(shí)間的n秒后的時(shí)間：
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
NSDate *nowDate = [NSDate date];
NSString *currentTimeStr = [formatter stringFromDate:nowDate];//2022-08-30 11:11:58
NSLog(@"目前時(shí)間==%@",currentTimeStr);
// n秒后時(shí)間
NSDate *afterDate = [NSDate dateWithTimeInterval:n sinceDate:nowDate];
NSString *afterTime = [formatter stringFromDate:afterDate];
NSLog(@"之后時(shí)間==%@",afterTime);
若需要之前時(shí)間，在n之前加個(gè)“-”
