面试答题：

截屏2021-03-03 下午1.54.54.png

1.hi1  hello2       hello2 hi1
2.
方法：
- (CGFloat)getLeastFromArray:(NSArray *)array {
    NSMutableArray *minArr = [NSMutableArray arrayWithCapacity:0];
    for (int i = 0; i<array.count; i++) {
        NSString *dateStr = array[i];
        /// 1.先将时间转换为分钟
        NSArray *arr = [dateStr componentsSeparatedByString:@":"];
        NSInteger min = [arr.firstObject integerValue] * 60 + [arr.lastObject integerValue];
        [minArr addObject:@(min)];
    }
    
    NSMutableArray *differentialArr = [NSMutableArray arrayWithCapacity:0];

    for (int i = 0; i<minArr.count-1; i++) {
        NSInteger min = [minArr[i] integerValue];
        
        NSMutableArray *differentialArr1 = [NSMutableArray arrayWithCapacity:0];
        for (int j = i+1; j<minArr.count; j++) {
            NSInteger differential1 = labs(min - [minArr[j] integerValue]);
            NSInteger differential2 = 24*60 - differential1;
            
            [differentialArr1 addObject:@(MIN(differential2, differential1))];
        }
        
        [differentialArr addObject:@([[differentialArr1 valueForKeyPath:@"@min.floatValue"] floatValue])];
    }
    
    CGFloat least = [[differentialArr valueForKeyPath:@"@min.floatValue"] floatValue];
    return least;
}
 
调用： 
[self getLeastFromArray:@[@"23:30", @"22:01", @"16:30", @"05:00",@"20:05"]];


3. 
方法：
- (void)setInfo:(NSDictionary *)info ForKey:(NSString *)key {
    [[NSUserDefaults standardUserDefaults] setObject:info forKey:key];
    [[NSUserDefaults standardUserDefaults] synchronize];
}
调用：
[self setInfo:json ForKey:@"getUserById"];

4.
方法：
- (NSString *)getMaxWithFigure:(NSString *)figure {
    NSMutableArray *arr = [NSMutableArray arrayWithCapacity:0];
    for (int i = 0; i<figure.length; i++) {
        NSString *figureItem = [figure substringWithRange:NSMakeRange(i, 1)];
        [arr addObject:figureItem];
    }
    
    NSString *maxStr = [NSString stringWithFormat:@"%@",[arr valueForKeyPath:@"@max.floatValue"]];
    
    NSInteger index = [arr indexOfObject:maxStr];
    [arr exchangeObjectAtIndex:0 withObjectAtIndex:index];
    
    NSMutableString *figureStr = [[NSMutableString alloc] init];
    [arr enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        [figureStr appendString:(NSString *)obj];
    }];
    return figureStr;
}

调用：
[self getMaxWithFigure:@"1234"]