0 用户选择
//把数据源拿出来创建临时的数组，不要直接使用数据源
NSArray *answer = @[@1, @2, @3, @5, @6, @7, @8, @10];//答案数组
NSArray *select = @[@1, @4, @3, @9]; //用户选的选项
if ([answer isEqualToArray:select]) {
//一样就是对的
}else {
//不一样就是错的
//拿出来answer 和 select 中一样的
NSArray *selectTure = [answer filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF in %@", select]];
NSLog(@"用户选择对的 ->(即取出相同的元素:) %@", selectTure);
NSArray *selectWrong = [select filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"NOT (SELF in %@)", answer]];
NSLog(@"用户选择是错的 -> %@", selectWrong);
NSArray *unselectTure = [answer filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"NOT (SELF in %@)", selectTure]];
NSLog(@"用户没选择的正确答案 -> %@", unselectTure);
}
1 去除array内重复的 对象
//去除实体内 name 重复的对象
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
for (int i = 0; i <arrList_.count ; i++) {
Entity *entity1 = arrList_[i];
[dic setValue:entity1 forKey:entity1.name];
}
NSArray *tListEntity = [dic allValues];
[arrList_ removeAllObjects];
arrList_ = [NSMutableArray arrayWithArray:tListEntity];
2 取出array内相同的 对象
NSMutableArray *rescanList = [NSMutableArray array];
[arrList_ enumerateObjectsUsingBlock:^(Entity *entity1, NSUInteger idx1, BOOL *stop1) {
[pList enumerateObjectsUsingBlock:^(Entity *entity2, NSUInteger idx2, BOOL *stop2) {
if ([entity2.name isEqualToString:entity1.name]) {
[rescanList addObject:entity2.name];
}
}];
}];
3 array按照对象某个属性的 字母排序 文字 字母排序
if (pListInventoryWaveArr.count > 0) {
pListInventoryWaveArr = [[NSMutableArray alloc] initWithArray:[pListInventoryWaveArr sortedArrayUsingComparator:^NSComparisonResult(Entity * obj1, Entity * obj2) {
return [obj1.numbmer compare:obj2.numbmer options:NSNumericSearch];
}]];
}
4 array 根据返回时间排序
引自: NSArray和NSMutableArray内容排序(如按日期排序)
NSMutableArray *feedsBuffer;
//初始化buffer以及填充数据
//排序只需要两句话:已针对数组内对象的publishTime属性(NSDate)排序为例：
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"publishTime" ascending:NO];
[feedsBuffer sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
假如feedsBuffer是NSArray，那么有一个方法是
NSArray *sortedArray = [feedsBuffer sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
如果排序的依据比较复杂，那么可以使用Block进行大小判断自定义：
[feedsBuffer sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
//返回三者其一:NSOrderedAscending, NSOrderedSame, NSOrderedDescending
return NSOrderedSame;
}];
正则表达式-->可应用于对象直接进行比较,他会逐一遍历数组内的对象内的每一个属性
// 1 查找相同的数据
NSArray * arr2 = @[@4,@3,@2,@1];
NSArray * arr1 = @[@2,@3,@4,@5];
NSPredicate * filterPredicate_same = [NSPredicate predicateWithFormat:@"SELF IN %@",arr1];
NSArray * filter_no = [arr2 filteredArrayUsingPredicate:filterPredicate_same];
NSLog(@"%@",filterPredicate_same);
-----------------------华丽的分割线--------------
// 查找不同的数据
NSArray * arr2 = @[@4,@3,@2,@1];
NSArray * arr1 = @[@2,@3,@4,@5];
//找到在arr2中不在数组arr1中的数据
NSPredicate * filterPredicate1 = [NSPredicate predicateWithFormat:@"NOT (SELF IN %@)",arr1];
NSArray * filter1 = [arr2 filteredArrayUsingPredicate:filterPredicate1];
//找到在arr1中不在数组arr2中的数据
NSPredicate * filterPredicate2 = [NSPredicate predicateWithFormat:@"NOT (SELF IN %@)",arr2];
NSArray * filter2 = [arr1 filteredArrayUsingPredicate:filterPredicate2];
//NSArray * filter2 = [arr1 filteredArrayUsingPredicate:filterPredicate2];
//拼接数组
NSMutableArray *array = [NSMutableArray arrayWithArray:filter1];
[array addObjectsFromArray:filter2];
NSLog(@"%@",array);
其他：
iOS-数组排序
https://www.jianshu.com/p/ce51b37281ac
[iOS] 浅析排序规则描述类: NSSortDescriptor
https://blog.csdn.net/lxlzy/article/details/81187113
