IOS解析如何搜索一個子串的字符串數組？

Question

我正在使用解析數據庫來存儲一些記錄。我正在存儲一個字符串數組，我希望能夠在這個數組中搜索子字符串。下面是一個例子：

數組A：

["carbrown","blue","house","coldturkey"] 

陣列B：

["racecar","green","walking"] 

陣列C：

["greenturkey","users","published","ramp"] 

我希望能夠搜索像一個子car並獲得數組A和B作爲匹配結果，或搜索turkey給我匹配的r與數組A和C esults或​​給我數組B和C，等等..

我知道，對於字符串您可以在解析使用：

- (void)whereKey:(NSString *)key containsString:(NSString *)substring 

這是可能的陣列，也許正則表達式？

Answer 1

您可以使用NSPredicate來達到此目的。以下是一個例子。

NSArray *a = @[@"carbrown",@"blue",@"house",@"coldturkey"]; 
NSArray *b = @[@"racecar",@"green",@"walking"]; 
NSArray *c = @[@"greenturkey",@"users",@"published",@"ramp"]; 

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", @"car"]; 
NSArray *filteredArrayA = [a filteredArrayUsingPredicate:predicate]; 
NSArray *filteredArrayB = [b filteredArrayUsingPredicate:predicate]; 
NSArray *filteredArrayC = [c filteredArrayUsingPredicate:predicate]; 

if ([filteredArrayA count]) { 
    NSLog(@"A has car in it"); 
}