NSArray 技巧

NSString 拆分成 NSArray

NSString *_string = @"1,2,3,4,5";
NSArray  *_arr = [_string componentsSeparatedByString:NSLocalizedString(@",", nil)];

NSArray 转为 NSString

NSArray  *_arr = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4", @"5", nil];
NSString *_str = [_arr componentsJoinedByString:@","];

NSArray ,NSSet 互转

NSArray *arr = @[@"12-11", @"12-11", @"12-11", @"12-12", @"12-13", @"12-14"];  
NSSet *set = [NSSet setWithArray:arr]; //去重复
NSArray *sortDesc = @[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES]];  //排序
NSArray *sortSetArray = [set sortedArrayUsingDescriptors:sortDesc];  

数组中有字典的排序：

NSMutableArray *myMutableArr = [[NSMutableArray alloc] init];
NSDictionary *dicOne = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"price",@"2",@"number", nil];
NSDictionary *dicTWo = [NSDictionary dictionaryWithObjectsAndKeys:@"6",@"price",@"5",@"number", nil];
NSDictionary *dicThree = [NSDictionary dictionaryWithObjectsAndKeys:@"3",@"price",@"1",@"number", nil];
NSDictionary *dicFour = [NSDictionary dictionaryWithObjectsAndKeys:@"4",@"price",@"3",@"number", nil];
[myMutableArr addObject:dicOne];
[myMutableArr addObject:dicTWo];
[myMutableArr addObject:dicThree];
[myMutableArr addObject:dicFour];

NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"price" ascending:YES]];
[myMutableArr sortUsingDescriptors:sortDescriptors];
NSLog(@"排序后的数组%@",myMutableArr);

NSArray的字典条件去重

NSMutableArray *seatA = [NSMutableArray arrayWithArray:dataSource];
for (NSDictionary * one in dataSource) {
   for (NSDictionary * two in dataSource) {
       if ([one[@"seat"] isEqualToString:two[@"seat"]]&&![one.objectId isEqualToString:two.objectId]&&[seatA containsObject:one]) {
         //1. "seat"去除条件 2.不要去除了自己 3.保留一个
         [seatA removeObject:two];
     }
  }
}

NSMutableArray 去除特定(倒序)

NSMutableArray *array = [[NSMutableArray alloc]init];
[array addObjectsFromArray:@[@"1",@"2",@"3",@"4",@"5"]];

for (NSString * str in array.reverseObjectEnumerator) {
    if ([str isEqualToString:@"3"]||[str isEqualToString:@"4"]) {
        [array removeObject:str];
    }
}
NSLog(@"%@",array);
/*输出
 (
    1,
    2,
    5
 )
 */