消除数组中的重复项并对结果进行排序

发布于 2024-12-22 04:57:40 字数 1221 浏览 1 评论 0原文

我有一个从 plist 中检索其信息的应用程序。 plist 是一个包含键（author、cat、content）的 Dictionaries 数组。现在我想在表格中显示类别。所以我需要以排序的方式所有独特的类别条目。

我已成功实施以下方式，但我很感兴趣这是否是“正确”的解决方案。

遍历 plist 数组并使用所有类别创建新的 NSMutableArray 字典的条目
将此 NSMutableArray 放入 NSSet 中以获取唯一元素
将此 NSSet 放入 NSArray 中以获取唯一元素对其进行排序的可能性。
返回一个用排序后的 NSArray 启动的 NSMutableArray

我觉得不是，这是这样做的正确方法。有什么建议可以做得更好吗？

多谢！

//InhaltefromWEb is a NSMutableArray
-(NSArray*) getCategories {
NSMutableArray* categorieTemp = [[NSMutableArray alloc] init];  

unsigned count = [InhalteFromWeb count];
while (count--) {
    NSString *tempString;
    tempString=[[InhalteFromWeb objectAtIndex:count] objectForKey:CATEGORY];
    NSLog(@"tempString %@", tempString );
    [categorieTemp addObject:tempString];
}

NSSet *uniqueElements = [NSSet setWithArray:categorieTemp];
NSLog(@"categories from engine %@", categorieTemp);
NSArray* tempAr = [[[NSArray alloc] initWithArray:[uniqueElements allObjects]]sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];

return  [NSMutableArray arrayWithArray:tempAr];

}

原文

I have an app which is retrieving its information from a plist.
The plist is an array of Dictionaries with the keys (author, cat, content).
Now I would like to show the categories in a table.
So I need all unique category entries in a sorted way.

I have successfully implemented following way but I am interested if this is the "right" solution.

Go through plist array and make new NSMutableArray with all category
entries of the dictionary
put this NSMutableArray into a NSSet to get unique Elements
put this NSSet into an NSArray to have the possibility to sort it.
return a NSMutableArray initiated with the sorted NSArray

I feel not , that this is the right way of doing so.
Any suggestions to do it better ?

Thanks a lot!

//InhaltefromWEb is a NSMutableArray
-(NSArray*) getCategories {
NSMutableArray* categorieTemp = [[NSMutableArray alloc] init];  

unsigned count = [InhalteFromWeb count];
while (count--) {
    NSString *tempString;
    tempString=[[InhalteFromWeb objectAtIndex:count] objectForKey:CATEGORY];
    NSLog(@"tempString %@", tempString );
    [categorieTemp addObject:tempString];
}

NSSet *uniqueElements = [NSSet setWithArray:categorieTemp];
NSLog(@"categories from engine %@", categorieTemp);
NSArray* tempAr = [[[NSArray alloc] initWithArray:[uniqueElements allObjects]]sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];

return  [NSMutableArray arrayWithArray:tempAr];

}

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Oo萌小芽oO 2024-12-29 04:57:40

使用 [categorieTemp containsObject:tempString] 检查现有字符串，并使用 [categorieTemp sortUsingComparator:...] 对其进行排序

示例：

[categorieTemp sortUsingComparator:^NSComparisonResult(id obj1, id obj2)
{
    return [(NSString *)obj1 caseInsensitiveCompare:(NSString *)obj2];
}];

Check for existing String with [categorieTemp containsObject:tempString] and sort it with [categorieTemp sortUsingComparator:...]

Example:

[categorieTemp sortUsingComparator:^NSComparisonResult(id obj1, id obj2)
{
    return [(NSString *)obj1 caseInsensitiveCompare:(NSString *)obj2];
}];

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心的位置 2024-12-29 04:57:40

我这样做是为了对数组进行日期排序：

[array sortedArrayUsingComparator: ^(id obj1, id obj2) {
        NSDate *date1 = [obj1 objectForKey:@"datum"] == nil ? nilDate : [obj1 objectForKey:@"datum"];
        NSDate *date2 = [obj2 objectForKey:@"datum"] == nil ? nilDate : [obj2 objectForKey:@"datum"];
        return (NSComparisonResult)[date2 compare: date1];
    }];

I do this to sort my array for a date:

[array sortedArrayUsingComparator: ^(id obj1, id obj2) {
        NSDate *date1 = [obj1 objectForKey:@"datum"] == nil ? nilDate : [obj1 objectForKey:@"datum"];
        NSDate *date2 = [obj2 objectForKey:@"datum"] == nil ? nilDate : [obj2 objectForKey:@"datum"];
        return (NSComparisonResult)[date2 compare: date1];
    }];

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