JSON陣列選擇器視圖iPhone

我正在從JSON Web服務JSON陣列選擇器視圖iPhone

List ARRAY: (
    { 
    assets =   (
        { 
      identity = 34DL3611; 
      systemId = 544507; 
     }, 
        { 
      identity = 34GF0512; 
      systemId = 5290211; 
     }, 
        { 
      identity = 34HH1734; 
      systemId = 111463609; 
     }, 
        { 
      identity = 34HH1736; 
      systemId = 111463622; 
     }, 
        { 
      identity = 34YCJ15; 
      systemId = 294151155; 
     } 
    ); 
    identity = DEMO; 
    systemId = 4921244; 
})

該數據通過使用此代碼：

NSArray *list =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 

NSLog(@"Response data: %@", responseString); 

NSLog(@"List ARRAY: %@", list); 

NSDictionary *dict = [list objectAtIndex: 0]; 

NSMutableArray *vehicleGroups = [dict objectForKey:@"identity"]; 

NSLog(@"Vehicle Groups: %@", vehicleGroups);

這裏是我使用的選擇器代碼：

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ 
return 1;} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent :(NSInteger)component { 
return [vehicleGroups count];} 

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{return nil;} 

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 
}

應用程序崩潰在線

return [vehicleGroups count];

委託方法numberOfRowsInComponent的pickerView。我不明白 - 爲什麼我面臨這個問題？

//代碼////

NSArray *list =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 

NSLog(@"Response data: %@", responseString); 

NSLog(@"List ARRAY: %@", list); 

NSDictionary *dict = [list objectAtIndex: 0]; 

vehicleList = [dict objectForKey: @"assets"]; 

self.vehicleGroups = [[NSMutableArray alloc] init]; 

vehicleGroups = [dict objectForKey:@"identity"]; 

NSLog(@"Vehicle Groups: %@", vehicleGroups); 

NSString *identity = [dict objectForKey: @"identity"]; 

NSString *systemid = [dict objectForKey:@"systemId"]; 

self.listVehicles = [[NSMutableArray alloc] init]; 

self.listVehiclesID =[[NSMutableArray alloc]init]; 

NSLog(@"GroupOfVehicles: %@", groupOfVehicles); 

for (NSUInteger index = 0; index < [vehicleList count]; index++) { 

    itemDict = [vehicleList objectAtIndex: index]; 

    [self.listVehicles addObject:[itemDict objectForKey:@"identity"]]; 

    [self.listVehiclesID addObject:[itemDict objectForKey:@"systemId"]]; 
} 

NSLog(@"Group Name: %@", identity); 

NSLog(@"Assets: %@", listVehicles); 

NSLog(@"Assets System ID: %@", listVehiclesID); 

NSLog(@"GroupSystemID: %@", systemid);

來源

2012-01-17 Omer Waqas Khan

有沒有什麼記錄，它給了我一個消息：程序接收到的信號：EXC_BAD_ACCESS – 2012-01-17 07:07:39

有什麼可以解決的問題？ – 2012-01-17 07:11:04

我收到了：Vehicle Groups：DEMO – 2012-01-17 07:13:29

回答我的問題引導人，如果他們面臨同樣的問題，其實我在這裏做以獲取身份所要求的陣列：DEMO如下：

vehicleGroups =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 

NSLog(@"Response data: %@", responseString); 

NSLog(@"List ARRAY: %@", vehicleGroups); 

NSDictionary *dict1 = [vehicleGroups objectAtIndex: 0]; 

NSString *identity1 = [dict objectForKey: @"identity"]; 

NSLog(@"dictNEW: %@", dict1); 

groupOfVehicles = [[NSMutableArray alloc] init]; 
for (NSUInteger index = 0; index < [vehicleGroups count]; index++) { 

    itemDict = [vehicleGroups objectAtIndex: index]; 

    [groupOfVehicles addObject:[itemDict objectForKey:@"identity"]]; 
} 

NSLog(@"Group Name NEW: %@", identity1); 

NSLog(@"Groups NEW: %@", groupOfVehicles);

使用代碼我已經正確了後陣爲我所需的數據

來源

2012-01-18 07:20:24

你必須初始化你的陣列的第一

NSDict *list =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 

NSLog(@"List Dict: %@", list); 

NSMutableArray *temp = list[@"assets"]; 
NSMutableArray *vehicleGroups = [NSMutableArry array]; 
vehicleGroups = temp[0][@"identity"]; 

NSLog(@"Vehicle Groups: %@", vehicleGroups);

來源

2012-01-17 07:33:22 Hiren

已經初始化它現在，但問題仍然存在 – 2012-01-17 07:34:28

然後NSLog你的字典，並檢查它的顯示或零也tyr首先NSLog你的字典 – Hiren 2012-01-17 07:44:01

是它不是空的，它被顯示，而不是零 – 2012-01-17 07:52:08

保留數組

[vehicleGroups retain]後vehicleGroups = [dict objectForKey:@"identity"];

來源

2012-01-17 07:35:41 Sarah

我曾經嘗試這樣做，現在得到了在控制檯上此錯誤： - [__ NSCFString計數]：無法識別的選擇發送到實例 – 2012-01-17 07:38:42

NSDictionary *dicts = [list objectAtIndex: 0]; 
NSMutableArray *vehicleGroups = [[NSMutableArray alloc] init]; 
for (NSDictionary *dict in dicts) 
{ 
    NSString* identity = [dict objectForKey:@"identity"]; 
    [vehicleGroups addObject:identity]; 
} 
NSLog("count is %d",[vehicleGroups count]);

有一個嘗試:)

來源

2012-01-17 07:52:39 Bonny

遇到錯誤[__NSCFString ADDOBJECT：]：無法識別的選擇發送到實例 – 2012-01-17 07:56:43

您的JSON數據不是JSON。

{ 
    "assets" : [ 
     { 
      "identity" : "34DL3611", 
      "systemId" : 544507 
     }, 
     .... 
     { 
      "identity" = "34YCJ15", 
      "systemId" = 294151155 
     } 
    ], 
    "identity" = "DEMO", 
    "systemId" = 4921244 
}

這是在JSON中描述的數據的可能示例。

來源

2012-01-17 11:07:49

NSDictionary *dict = [list objectAtIndex: 0]; 

NSMutableArray *vehicleGroups = [dict objectForKey:@"identity"];

它看起來對我來說，dict這裏是一個有三個項目的字典：資產，身份和的systenId。在這個層次上，身份的價值只是一個字符串，「DEMO」，但你試圖把它分配給一個可變數組。我想你想這樣的事情，而不是：

NSDictionary *dict = [list objectAtIndex: 0]; 
NSArray *assets = [dict objectForKey:@"assets"]; 
NSArray *vehicleGroups = [assets objectForKey:@"identity"];

（沒關係發送-objectForKey:到一個數組中 - 你回到對應於在接收器的每個對象給予重點對象的數組。）

來源

2012-01-17 11:18:04 Caleb

JSON陣列選擇器視圖iPhone

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