[英]Using NSPredicate with nested arrays ios
我有這樣的數組
NSMutableArray *level1;
NSMutableArray *level2;
NSMutableArray *level3;
self.questionSections=[[NSArray alloc] initWithObjects:@"Level 1",@"Level 2",@"Level 3", nil];
level1=[[NSMutableArray alloc] init];
level2=[[NSMutableArray alloc] init];
level3=[[NSMutableArray alloc] init];
[level1 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
@"What is the opposite of up?",@"name",
@"101q.png",@"questionpicture",
nil]];
[level1 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
@"What is the opposite of front?",@"name",
@"102q.png",@"questionpicture",
nil]];
[level2 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
@"Name a common pet?",@"name",
@"201q.png",@"questionpicture",
nil]];
[level2 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
@"Name a common bird?",@"name",
@"202q.png",@"questionpicture",
nil]];
[level3 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
@"List 3 rooms in your house?",@"name",
@"301q.png",@"questionpicture",
nil]];
self.questionData=[[NSArray alloc] initWithObjects:level1,level2,level3, nil];
我想搜索它。 我正在嘗試這個但是無處可去
NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:@"name CONTAINS 'the'"];
NSLog(@"%@",resultPredicate);
NSLog(@"%@",self.questionData);
self.searchResults=[self.questionData filteredArrayUsingPredicate:resultPredicate];
NSLog(@"%@",self.searchResults);
resultPredicate
看起來很好“名稱包含'the'”
self.questionData
看起來不錯
但是self.searchResults
只是()
任何有幫助的想法都會很棒。 謝謝。
我用子查詢來解決這個問題
NSArray *questionData=[[NSArray alloc] initWithObjects:level1,level2,level3, nil];
NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:@"SUBQUERY(name, $content, $content CONTAINS %@).@count > 0", @"the"];
NSArray *searchResults=[questionData filteredArrayUsingPredicate:resultPredicate];
NSLog(@"%@",searchResults);
結果::
(
(
{
name = "What is the opposite of up?";
questionpicture = "101q.png";
},
{
name = "What is the opposite of front?";
questionpicture = "102q.png";
}
)
)
這是數組的問題。
(
(
{
name = "What is the opposite of up?";
questionpicture = "101q.png";
},
{
name = "What is the opposite of front?";
questionpicture = "102q.png";
}
),
(
{
name = "Name a common pet?";
questionpicture = "201q.png";
},
{
name = "Name a common bird?";
questionpicture = "202q.png";
}
),
(
{
name = "List 3 rooms in your house?";
questionpicture = "301q.png";
}
)
)
為了工作上述謂詞,則數組必須是這樣的,
(
{
name = "What is the opposite of up?";
questionpicture = "101q.png";
},
{
name = "What is the opposite of front?";
questionpicture = "102q.png";
},
{
name = "Name a common pet?";
questionpicture = "201q.png";
},
{
name = "Name a common bird?";
questionpicture = "202q.png";
},
{
name = "List 3 rooms in your house?";
questionpicture = "301q.png";
}
)
編輯:-嘗試這樣,
NSArray *questionData=[[NSArray alloc] initWithObjects:level1,level2,level3, nil];
NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:@"name CONTAINS 'the'"];
NSMutableArray *resultarray= [[NSMutableArray alloc]init];
for(int i=0;i<[questionData count];i++){
NSArray* searchResults=[[questionData objectAtIndex:i] filteredArrayUsingPredicate:resultPredicate];
if([searchResults count]>0)
[resultarray addObject:searchResults];
}
NSLog(@"%@",resultarray);
O/P:-
(
(
{
name = "What is the opposite of up?";
questionpicture = "101q.png";
},
{
name = "What is the opposite of front?";
questionpicture = "102q.png";
}
)
)
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