对半查找，选择排序，冒泡排序和快速排序的Objective-C实现

-(IBAction)zheBanChaZhao:(id)sender{
    
    NSMutableArray * allObj=[[NSMutableArray alloc] init];
    int base =0;
    int findY=arc4random()%1000;
    for (int i=1; i<100; i++) {
        int tmpX=arc4random() % 10;
        base+=tmpX;
        [allObj addObject:[NSNumber numberWithInt:base]];
    }
    NSMutableString *mulStr=[[NSMutableString alloc] init];
    NSInteger count=[allObj count];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
         [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    NSLog(@"当前的数组 %@  要查找的值 %d",mulStr,findY);
    NSInteger index=-1;
    NSInteger low =0;
    NSInteger high=allObj.count-1;
    while (low < high) {
        
        NSInteger mid=(low+high)/2;
        NSNumber *tmpNum=[allObj objectAtIndex:mid];
        int tmpInt=[tmpNum intValue];
        if (findY < tmpInt) {
            high = mid-1;
        } else if(findY > tmpInt) {
            low = mid+1;
        }else{
            index = mid;
            break;
        }
    }
    
    if (index != -1) {
        NSLog(@"找到了 是第%ld个数字",index);
    }else{
        NSLog(@"没有找到\n");
    }
    
    
}


-(IBAction)xuanZhePaiXu:(id)sender{
   
    NSMutableArray * allObj=[[NSMutableArray alloc] init];
    for (int i=1; i<30; i++) {
        int tmpX=arc4random() % 100;
        [allObj addObject:[NSNumber numberWithInt:tmpX]];
    }
    NSMutableString *mulStr=[[NSMutableString alloc] init];
    NSInteger count=[allObj count];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
        [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    NSLog(@"当前的数组 %@",mulStr);
    for (int i=0; i<count; i++) {
        for (int j=i; j<count; j++) {
            NSNumber *iNum=[allObj objectAtIndex:i];
            NSNumber *jNum=[allObj objectAtIndex:j];
//            if ([iNum integerValue] < [jNum integerValue]) {
//                [allObj exchangeObjectAtIndex:j withObjectAtIndex:i];
//            }
            
            if ([iNum integerValue] > [jNum integerValue]) {
                [allObj exchangeObjectAtIndex:j withObjectAtIndex:i];
            }
        }
    }
    mulStr=[[NSMutableString alloc] init];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
        [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    NSLog(@"排序后的数组 %@",mulStr);
    
}

-(IBAction)maoPao:(id)sender{
    
    NSMutableArray * allObj=[[NSMutableArray alloc] init];
    for (int i=1; i<30; i++) {
        int tmpX=arc4random() % 100;
        [allObj addObject:[NSNumber numberWithInt:tmpX]];
    }
    NSMutableString *mulStr=[[NSMutableString alloc] init];
    NSInteger count=[allObj count];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
        [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    NSLog(@"当前的数组 %@",mulStr);
    for (int i=1; i<count; i++) {
        for (int j=0; j<count-i; j++) {
           
            NSNumber *jNum=[allObj objectAtIndex:j];
            NSNumber *jNum1=[allObj objectAtIndex:j+1];
          
            if ([jNum1 integerValue] > [jNum integerValue]) {
                [allObj exchangeObjectAtIndex:j withObjectAtIndex:j+1];
            }
        }
    }
    mulStr=[[NSMutableString alloc] init];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
        [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    NSLog(@"排序后的数组 %@",mulStr);
    
    
}

-(IBAction)kuaiSu:(id)sender{
    
    
    NSMutableArray * allObj=[[NSMutableArray alloc] init];
    for (int i=1; i<10; i++) {
        int tmpX=arc4random() % 100;
        [allObj addObject:[NSNumber numberWithInt:tmpX]];
    }
    NSMutableString *mulStr=[[NSMutableString alloc] init];
    NSInteger count=[allObj count];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
        [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    NSLog(@"当前的数组 %@",mulStr);

    [self kuaiSu:allObj withLeftIndex:0 andRightIndex:allObj.count - 1];
    
    mulStr=[[NSMutableString alloc] init];
    for (NSInteger i=0; i<count; i++) {
        NSNumber *num = [allObj objectAtIndex:i];
        [mulStr appendString:[NSString stringWithFormat:@"%ld,",[num integerValue]]];
    }
    
    NSLog(@"当前的数组 %@",mulStr);
    
}
- (void)kuaiSu:(NSMutableArray *)array withLeftIndex:(NSInteger)leftIndex andRightIndex:(NSInteger)rightIndex
{
    if (leftIndex >= rightIndex) {//如果数组长度为0或1时返回
        return ;
    }
    
    NSInteger i = leftIndex;
    NSInteger j = rightIndex;
    //记录比较基准数
    NSInteger key = [array[i] integerValue];
    
    while (i < j) {
        /**** 首先从右边j开始查找比基准数小的值 ***/
        while (i < j && [array[j] integerValue] >= key) {//如果比基准数大，继续查找
            j--;
        }
        //如果比基准数小，则将查找到的小值调换到i的位置
        array[i] = array[j];
        
        /**** 当在右边查找到一个比基准数小的值时，就从i开始往后找比基准数大的值 ***/
        while (i < j && [array[i] integerValue] <= key) {//如果比基准数小，继续查找
            i++;
        }
        //如果比基准数大，则将查找到的大值调换到j的位置
        array[j] = array[i];
        
    }
    
    //将基准数放到正确位置
    array[i] = @(key);
    
    //排序基准数左边的
    [self kuaiSu:array withLeftIndex:leftIndex andRightIndex:i - 1];
    //排序基准数右边的
    [self kuaiSu:array withLeftIndex:i + 1 andRightIndex:rightIndex];
}

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