遍历字典数组集合

 

NSArray *cityArray = [NSArray arrayWithObjects:@"中国北京",@"中国郑州",@"中国洛阳",@"中国杭州",@"中国香港",@"中国台湾", nil];
        NSDictionary *personInforDic = [NSDictionary dictionaryWithObjectsAndKeys:@"zhangsan",@"name",@"nan",@"sex",[NSNumber numberWithInt:28],@"age",nil];
        NSSet *stringSet = [NSSet setWithObjects:@"123",@"456",@"789",@"0X0",nil];
//
        /*
         for循环遍历
         */
        //遍历数组
        for(int i = 0;i < cityArray.count;i++){
           NSString *string = [cityArray objectAtIndex:i];
            NSLog(@"cityArray[%d] = %@",i,string);
        }
        //遍历字典
        NSArray *keys = [personInforDic allKeys];
        for (int i = 0; i < personInforDic.count; i++) {
            NSString *key = [keys objectAtIndex:i ];
            NSString *value  = [personInforDic valueForKey:key];
            NSLog(@"%@ = %@",key,value);
        }
        //遍历集合
        NSArray *setObject = [stringSet allObjects];
        for (int i = 0; i < stringSet.count; i++) {
            NSLog(@"%@",[setObject objectAtIndex:i]);
        }
        
        /*
         NSEnumerator
         */
        //NSEnumerator 数组----正序遍历
        NSEnumerator *arrEnu = [cityArray objectEnumerator];
        
        id value = nil;
        while (value = [arrEnu nextObject]) {
            NSLog(@"%@",value);
        }
        NSLog(@"------------------");
        //NSEnumerator 数组----倒序遍历
        NSEnumerator *arrayEnu = [cityArray reverseObjectEnumerator];
        id value1 = nil;
        while (value1 = [arrayEnu nextObject]) {
            NSLog(@"%@",value1);
        }
        
        //NSEnumerator 字典
        NSEnumerator *arrEnu1 = [personInforDic objectEnumerator];
        
        id value2 = nil;
        while (value2 = [arrEnu1 nextObject]) {
            NSLog(@"%@",value2);
        }
        //NSEnumerator 集合
        NSEnumerator *setEnu = [stringSet objectEnumerator];
        id value3 = nil;
        while (value3 = [setEnu nextObject]) {
            NSLog(@"%@",value3);
        }
        /*
         for----in 遍历
         */
        //for----in 遍历数组
        for (NSString *cityName in cityArray) {
            NSLog(@"cityName = %@",cityName);
        }
        //for----in 遍历字典
        for (NSString *key in personInforDic) {
            NSLog(@"%@ = %@",key,[personInforDic objectForKey:key]);
        }
        //for----in 遍历集合
        for (NSString *ss in setEnu) {
            NSLog(@"%@",ss);
        }
//
#pragma mark------数组排序---------
        
        
        //创建一个可变数组
//        NSMutableArray *sortArray = [NSMutableArray arrayWithObjects:@"aa",@"bb",@"cc",@"ee",@"dd", nil];
//        for (int i = 0; i < sortArray .count - 1; i++) {
//            for (int k = 0; k < sortArray.count - i - 1; k++) {
//                if ([sortArray[k] compare:sortArray[k+1]] > 0) {
//                    [sortArray exchangeObjectAtIndex:k withObjectAtIndex:k+1];
//                }
//            }
//        }
//        NSLog(@"%@",sortArray);
         //sortedArrayUsingSelector 是有返回值的,返回值是排序之后的数组
//        NSArray *sortArray1 = [sortArray sortedArrayUsingSelector:@selector(compare:)];
//        NSLog(@"%@",sortArray1);
//         //sortUsingSelector 这是一个没有返回值的,改变的就是调用这个方法的数组的本身
//        [sortArray sortUsingSelector:@selector(compare:)];
//        NSLog(@"%@",sortArray);
//        //降序排序
//        NSMutableArray *array = [NSMutableArray array];
//        //上面的语句相当于 NSMutableArray *array = [[NSMutableArray alloc] init];
//        for (NSInteger i = sortArray.count - 1 ; i >= 0; i--) {
//            [array addObject:sortArray[i]];
//        }
//        NSLog(@"%@",array);
        /*
         数组排序 ------数组中存放自定义类的对象
         */
        Person *per1 = [Person personWithName:@"zhang1" Age:18 Sex:@"nan"];
        Person *per2 = [Person personWithName:@"zhang2" Age:19 Sex:@"nan"];
        Person *per3 = [Person personWithName:@"zhang3" Age:20 Sex:@"nan"];
        Person *per4 = [Person personWithName:@"zhang4" Age:21 Sex:@"nan"];
        Person *per5 = [Person personWithName:@"zhang5" Age:22 Sex:@"nan"];
       
        //根据多个person对象,生成数组
        NSArray *personArray = [NSArray arrayWithObjects:per1,per2,per3,per4,per5, nil];
//        //不可变数组排序
//        //生成排序描述符
//        NSSortDescriptor *sortName = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
//        //通过排序描述符对数组进行排序,生成新的数组
//        NSArray *sortedName = [personArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortName]];
//        NSLog(@"%@",sortedName);
//        //按照年龄降序排序
//        NSSortDescriptor *sortAge = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:NO];
//        NSArray *sortedAge = [personArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortAge]];
//        NSLog(@"%@",sortedAge);
        //可变数组
        NSMutableArray *marray = [personArray mutableCopy];
        
        //生成排序描述符 --------按人的姓名降序
        NSSortDescriptor *sortWithName = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:NO];
        
        //通过排序描述符对数组进行排序
        [marray sortUsingDescriptors:[NSArray arrayWithObject: sortWithName]];
        NSLog(@"%@",marray);