IOS--常用類--NSArray

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一、從小到大排序

　　//**************************************************************************

    //1.注意可變數組和不可變數組 所用的方法不同(其實直接去NSArray 和NSMutableArray 各自api中找即可)

    NSArray *myArray=[NSArray arrayWithObjects:@"5",@"6",@"1",@"2",@"3",@"4", nil];

    NSMutableArray *myMutableArray=[NSMutableArray arrayWithObjects:@"5",@"6",@"1",@"2",@"3",@"4", nil];

    

    NSArray *last=[myArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

        if ([obj1 intValue]>[obj2 intValue]) {

            return NSOrderedDescending;

        }

        else if ([obj1 intValue]<[obj2 intValue])

        {

            return NSOrderedAscending;

        }

        else

            return NSOrderedSame;

    }];

    NSLog(@"last:%@",last);

    

    [myMutableArray sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {

        if ([obj1 intValue]>[obj2 intValue]) {

            return NSOrderedDescending;

        }

        else if ([obj1 intValue]<[obj2 intValue])

        {

            return NSOrderedAscending;

        }

        else

            return NSOrderedSame;

    }];

    NSLog(@"myMutable:%@",myMutableArray);

    //**************************************************************************

    

    //**************************************************************************

    //2.可按多個關鍵字進行排序

    NSDictionary *dic1=[NSDictionary dictionaryWithObjectsAndKeys:@"2",@"id",@"11",@"age", nil];

    NSDictionary *dic2=[NSDictionary dictionaryWithObjectsAndKeys:@"1",@"id",@"13",@"age", nil];

    NSDictionary *dic3=[NSDictionary dictionaryWithObjectsAndKeys:@"3",@"id",@"12",@"age", nil];

    NSArray *array=[NSArray arrayWithObjects:dic1,dic2,dic3, nil];

    

    //先按id,再按age排序 (ascending:是否是變大的順序)

    NSSortDescriptor *descriptor1=[NSSortDescriptor sortDescriptorWithKey:@"id" ascending:YES];

    NSSortDescriptor *descriptor2=[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];

    NSArray *descriptorArray=[NSArray arrayWithObjects:descriptor1,descriptor2, nil];

    

    NSArray *lastArray=[NSArray arrayWithArray:[array sortedArrayUsingDescriptors:descriptorArray]];

    NSLog(@"lastArray:%@",lastArray);

    //**************************************************************************

IOS--常用類--NSArray