如何比较2 NSArrays像NSPredicate包含 [英] How to compare 2 NSArrays like NSPredicate Contains
问题描述
大家好，这是我的问题
NSArray *recipeIngredientsArray = [recipeIngString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]];
NSArray *haveIngArray = [searchText componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]];
if (haveIngArray.count==recipeIngredientsArray.count)
{
//check the contents of 2 arrays
}
我从CoreData中获取了2个数组，并且它们的数组长度相同，我将检查内容。
I have 2 arrays that I take from CoreData and if their array length are the same, I will check the content.
在 haveIngArray 中，我将使用大米之类的字符串，鸡肉，生菜。
在 recipeIngredientsArray 中，我有类似 1汤匙饭， 150 gr鸡肉， 1的字符串一杯牛奶
In haveIngArray, I will have strings like "rice", "chicken","lettuce".
In recipeIngredientsArray I have strings like "1 spoon of rice","150 gr chicken","1 cup of milk"
在任何地方都可以在 recipeIngredientsArray 中看到诸如大米和鸡肉之类的字符串？
Is there anyway to see strings like "rice" and "chicken" is available in recipeIngredientsArray?
我尝试将 NSPredicate 与contains一起使用，但效果并不理想。
I tried to use NSPredicate with contain but it didn't turn out well.
我愿意接受建议
谢谢
推荐答案
recipeIngredientsArray 不应包含字符串，而应包含两个字典，其中一个键/值是 @ ingredientName：@ rice 或属性名称的成分类的更好对象。
recipeIngredientsArray should not contain strings but either dictionaries where one Key/value is @"ingredientName":@"rice" or better objects of class Ingredient with a property name. Than it will become much easier to be queried by predicates.
#import <Foundation/Foundation.h>
@interface RecipeIngredient : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, strong) NSNumber *amount;
@property (nonatomic, copy) NSString *unit;
@end
@implementation RecipeIngredient
-(NSString *)description
{
return [NSString stringWithFormat:@"%@ %@ %@", _amount, _unit, _name];
}
@end
int main(int argc, const char * argv[])
{
@autoreleasepool {
NSArray *recipeIngredientsArray = @[
({
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = @(1);
ing.name = @"rice";
ing.unit = @"spoon";
ing;
}),
({
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = @(150);
ing.name = @"chicken";
ing.unit = @"gr";
ing;
}),
({
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = @(1);
ing.name = @"milk";
ing.unit = @"cup";
ing;
}),
];
NSArray *haveIngArray = @[@"rice", @"chicken", @"lettuce"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@" self.name in %@", haveIngArray];
NSArray *filteredArray = [recipeIngredientsArray filteredArrayUsingPredicate:predicate];
for (RecipeIngredient *ing in filteredArray) {
NSLog(@"%@", ing);
}
}
return 0;
}
输出：
output:
1 spoon rice
150 gr chicken
如何知道食谱中没有或冰箱中不存在的东西的例子：
Example ho to know what is not in the recipe or not present in the fridge:
NSArray *recipeIngredientsArray = @[
({
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = @(1);
ing.name = @"rice";
ing.unit = @"spoon";
ing;
}),
({
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = @(150);
ing.name = @"chicken";
ing.unit = @"gr";
ing;
}),
({
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = @(1);
ing.name = @"milk";
ing.unit = @"cup";
ing;
}),
];
NSArray *haveIngArray = @[@"rice", @"chicken", @"lettuce"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"not (self.name in %@)", haveIngArray];
NSArray *filteredArray = [recipeIngredientsArray filteredArrayUsingPredicate:predicate];
NSArray *filteredIngNames = [filteredArray valueForKey:@"name"];
NSLog(@"in recipe but not in fridge: %@", filteredIngNames);
predicate = [NSPredicate predicateWithFormat:@"not (self in %@.name)", recipeIngredientsArray];
filteredArray = [haveIngArray filteredArrayUsingPredicate:predicate];
NSLog(@"in fridge but not in recipe: %@", filteredArray);
输出：
output:
in recipe but not in fridge: (
milk
)
in fridge but not in recipe: (
lettuce
)
如何创建自定义成分对象构成您拥有的字符串：
How to create custom ingredient objects form the strings you have:
NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
[f setNumberStyle:NSNumberFormatterDecimalStyle];
NSArray *recipe = @[@"1 spoon of rice", @"150 gr chicken", @"1 cup of milk"];
NSMutableArray *recipeIngredientsArray = [@[] mutableCopy];
for (NSString *string in recipe) {
NSArray *a = [string componentsSeparatedByString:@" "];
RecipeIngredient *ing = [[RecipeIngredient alloc] init];
ing.amount = [f numberFromString:a[0]];
ing.name = [a lastObject];
ing.unit = [[a subarrayWithRange:NSMakeRange(1, [a count]-2)] componentsJoinedByString:@" "];
[recipeIngredientsArray addObject:ing];
}
记录配方成分数组打印
(
1 spoon of rice,
150 gr chicken,
1 cup of milk,
)
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