无法从NSDictionary获取所有匹配字符串iOS

问题描述：

我是iOS新手，逻辑上有点弱。无法从NSDictionary获取所有匹配字符串iOS

任何一个可以帮助我在这里，

我想从NSDictionary中得到所有匹配的数据。

如：

我tempDict是的NSDictionary包含此，

tempDict：

errorCode = 00; 
errorMessage = "<null>"; 
pastConsultations =  (

      { 
     date = "16 December 2016"; 
     day = Friday; 
     doctorName = "<null>"; 
     localTime = "07:30 AM"; 
     symptoms = q; 
     today = Yes; 
    }, 
      { 
     date = "16 December 2016"; 
     day = Friday; 
     doctorName = "<null>"; 
     localTime = "07:30 AM"; 
     symptoms = g; 
     today = Yes; 
    }, 
      { 
     date = "13 December 2016"; 
     day = Tuesday; 
     doctorName = "<null>"; 
     localTime = "12:30 PM"; 
     symptoms = fever; 
     today = No; 
    } 
); 
upcomingConsultations =  (
      { 
     date = "16 December 2016"; 
     day = Friday; 
     localTime = "09:30 PM"; 
     symptoms = ""; 
     today = Yes; 
    }, 
      { 
     date = "16 December 2016"; 
     day = Friday; 
     localTime = "09:30 PM"; 
     symptoms = chj; 
     today = Yes; 
    }, 
      { 
     date = "18 December 2016"; 
     day = Sunday; 
     localTime = "12:30 PM"; 
     symptoms = "test an incoming "; 
     today = No; 
    } 
); 
}

里面一个pastConsultations关键我想所有嵌套数据包含AM

即我的输出应该是：

{ //Array at 0th index 
      date = "16 December 2016"; 
      day = Friday; 
      doctorName = "<null>"; 
      localTime = "07:30 AM"; 
      symptoms = q; 
      today = Yes; 
     }, 
       { //Array at 1st index 
      date = "16 December 2016"; 
      day = Friday; 
      doctorName = "<null>"; 
      localTime = "07:30 AM"; 
      symptoms = g; 
      today = Yes; 
     } 
}

这是我试过的代码，但它不工作，请帮助我犯错误？

NSArray *allKeys; 
     for (int i=0; i<[tempDict count]; i++) { 
      allKeys = [[[tempDict valueForKey:@"upcomingConsultations"] objectAtIndex:i] allKeys]; 



      NSString *targetKey = nil; 
      // NSArray *allKeys = [[tempDict valueForKeyPath:@"pastConsultations"] allKeys]; 
      for (int j = 0; j < [allKeys count]; ++j) { 
       NSString *key = [allKeys objectAtIndex:i]; 
       NSString *obj = [[[tempDict valueForKey:@"upcomingConsultations"] objectAtIndex:i] objectForKey:key]; 
       if ([obj rangeOfString:searchText].location != NSNotFound) { // searchedString is what you're looking for 
        targetKey = key; 
        NSLog(@"found match"); 
        break; 
       } 
      } 
     }

有没有任何错误或者你没有得到结果？ –

没有得到结果 –

答

试试这个代码：

假设你已经有了tempDict辞典加载。

NSMutableArray *morningPastArr = [[NSMutableArray alloc] init]; 

NSArray *pastArray = [tempDict objectForKey:@"pastConsultations"]; 
for (int i=0;i<[pastArray count]; i++) { 
    NSDictionary *eachPast = [pastArray objectAtIndex:i]; 
    NSString *time = [eachPast objectForKey:@"localTime"]; 
    if (![time rangeOfString:@"AM"].location == NSNotFound) { 
    [morningPastArr addObject:eachPast]; 
    } 
} 

// finally you will have like what you need in morningPastArr.

编辑：如果你要搜索的结果结合起来，例如，结果AM条目，周五只有你可以这样做：

NSMutableArray *morningAndFridayPastArr = [[NSMutableArray alloc] init]; 

NSArray *pastArray = [tempDict objectForKey:@"pastConsultations"]; 
for (int i=0;i<[pastArray count]; i++) { 
    NSDictionary *eachPast = [pastArray objectAtIndex:i]; 
    NSString *time = [eachPast objectForKey:@"localTime"]; 
    NSString *day = [eachPast objectForKey:@"day"]; 
    if ((![time rangeOfString:@"AM"].location == NSNotFound)&&([day isEqualToString:@"Friday"])) { 
    [morningAndFridayPastArr addObject:eachPast]; 
    } 
}

为什么要使用循环？谓词比这更有效。 –

是的，我同意。你的代码更高效。但我不像你那么专业。我的代码通常更容易被新手（比如我自己）理解。我很抱歉写长码。 – GeneCode

这是工作顺利，我是新来的iOS我不知道谓词。你能说我如何使用谓词来实现这一点？ –

答

您可以使用NSPredicate为如下：

NSPredicate *predicate; 
NSMutableArray *filteredData=[[NSMutableArray alloc]init]; 

predicate = [NSPredicate predicateWithFormat:@"localTime contains[c] %@",@"AM"]; 
//OR Use below predicate as suggested by Rishi 
predicate = [NSPredicate predicateWithFormat:@"localTime ENDSWITH 'AM'"]; 

filteredData=[[[tempDict valueForKey:@"pastConsultations"] filteredArrayUsingPredicate:predicate]] mutableCopy];

希望这会有所帮助。

它返回空''filteredData检查 –

编辑的答案，还要检查是否'tempDict'不是'nil' @ Appledeveloper –

我仍然得到'filteredData'作为零还检查'tempDict'不是零 –

无法从NSDictionary获取所有匹配字符串iOS

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