ios-时间换算

经常会遇到时间转换的，在此收藏一个时间换算的方法〜

#pragma mark 时间换算

+ (NSString *)setcreateTime:(NSString *)str
{
    //yyyy-MM-dd- HH:MMss"];

    
    NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
    
    //[formatter setDateStyle:NSDateFormatterMediumStyle];
    
    //[formatter setTimeStyle:NSDateFormatterShortStyle];
    
    [formatter setDateFormat:@"yyyy"];
    
    [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"CCT"]];
    
    NSDate *date = [NSDate dateWithTimeIntervalSince1970:[str doubleValue]];
    
    NSString *dateStr = [formatter stringFromDate:date];
    
    //本地时间
    NSDate * senddate=[NSDate date];
    NSDateFormatter * dateformatter=[[NSDateFormatter alloc] init];
    [dateformatter setDateFormat:@"YYYY"];
    NSString * locationString=[dateformatter stringFromDate:senddate];
 
    //[dateformatter setDateFormat:@"YYYY-MM-dd-HH-mm-ss"];
    
    //判断创建时间 与 本地时间 是否同一年
    if ([dateStr isEqualToString:locationString]) {
        [formatter setDateFormat:@"MM-dd HH:mm"];
    }else{
        [formatter setDateFormat:@"yyyy-MM-dd HH:mm"];
    }
    
    date = [NSDate dateWithTimeIntervalSince1970:[str doubleValue]];
    dateStr = [formatter stringFromDate:date];
    
    return [self compareCurrentTime:date :dateStr];
}

+ (NSString *) compareCurrentTime:(NSDate*) compareDate :(NSString *)str
{
    NSTimeInterval  timeInterval = [compareDate timeIntervalSinceNow];
    timeInterval = -timeInterval;
    long temp = 0;
    NSString *result;
    if (timeInterval < 60) {
        if (timeInterval > 1) {
            result = [NSString stringWithFormat:@"%d秒前",(int)timeInterval+1];
        }else if (timeInterval < -160){
            result = str;
        }
        else{
            result = [NSString stringWithFormat:@"%d秒前",1];
        }
        
    }
    else if((temp = timeInterval/60) <60){
        result = [NSString stringWithFormat:@"%ld分钟前",temp];
    }else{
        result = str;
    }
    

    
    return  result;
}