获取当前时间

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NSDate *date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
//获取当前时间日期展示字符串 如：2019-05-23-13:58:59
NSString *str = [formatter stringFromDate:date];