如何在数组中查找重复值？

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我正在研究SQLite，我编写了一个查询，它返回两个数组ItemsArray和CustomersIDArray：

I am working on SQLite and I have written a query which returns me two arrays ItemsArray and CustomersIDArray as:

ItemsArray Element at Index 0 = Off White, Element at Index 1 = Fan, Element at Index 2 = Off White, Element at Index 3 = Delux, Element at Index 4 = Fan CustomerIDArray Element at Index 0 = 1, Element at Index 1 = 2, Element at Index 2 = 2, Element at Index 3 = 3, Element at Index 4 = 4

我想要结果就像Off White = 2（计数），Fan = 2（计数）和Delux = 1; 和结果数组，

I want result like that Off White = 2 (count) , Fan = 2 (count) and Delux = 1; and the Resultant Array,

Result Array Element at Index 0 = Off White, Element at Index 1 = Fan, Element at Index 2 = Delux

实际上我想要第一个数组中的重复次数，但CustomerArray的值必须不相同。 请帮我完成逻辑或代码。

Actually I want the count of repetition in first array but the value must not same for CustomerArray. Please help me through logic or code.

推荐答案

-(NSMutableArray *)getCountAndRemoveMultiples:(NSMutableArray *)array{ NSMutableArray *newArray = [[NSMutableArray alloc]initWithArray:(NSArray *)array]; NSMutableArray *countArray = [NSMutableArray new]; int countInt = 1; for (int i = 0; i < newArray.count; ++i) { NSString *string = [newArray objectAtIndex:i]; for (int j = i+1; j < newArray.count; ++j) { if ([string isEqualToString:[newArray objectAtIndex:j]]) { [newArray removeObjectAtIndex:j]; countInt++; } } [countArray addObject:[NSNumber numberWithInt:countInt]]; countInt = 1; } NSMutableArray *finalArray = [[NSMutableArray alloc] initWithObjects:newArray, countArray, nil]; NSLog(@"%@", finalArray); return finalArray; } - (IBAction)getArrayInfo:(id)sender { NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects:@"Off White", @"Fan", @"Off White", @"Deluxe", @"Fan", nil]; NSMutableArray *godArray = [self getCountAndRemoveMultiples:myArray]; NSLog(@"Array from this end = %@", godArray); }

我只是设置了-getArrayInfo来测试它。工作良好。如您所见，您要显示的数组将位于index：0，而indexArray位于index：1。

I just set up -getArrayInfo to test it out. Works fine. As you can see, the array you want to display will be at index:0, and the countArray at index:1.