IOS：[NSDictionary initWithObjects:forKeys:]：

Question

在我的项目中，我创建了一个包含对象和键的字典 我为对象和键创建 NSArray

但是当我尝试创建字典时，它会发送以下错误：

* 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“* -[NSDictionary initWithObjects:forKeys:]：对象计数 (2) 与计数不同 钥匙 (12)'

但我将所有 12 个对象都发送到字典

我的代码是：

NSArray *keys = [NSArray arrayWithObjects: @"api_key", @"truck_id",@"driver_id", @"member_id",@"amount",@"net_amount",@"vendor_id",@"delivery_date",@"address_id", @"create_Id", @"transaction_id",@"Cart_Details", nil];

NSLog(@"Truck Id Str is %@",TruckIdStr);
NSLog(@"Driver Id is %@",DriverIdStr);
NSLog(@"Member Id is %@",Member_id);
NSLog(@"Amount is %@",amount);
NSLog(@"Grand Total is %@",GrandTotalString);
NSLog(@"Vendor Id is %@",vendor_id);
NSLog(@"delivery date is %@",delivery_date);
NSLog(@"Address Id is %@",RcvdAddressId);
NSLog(@"Create Id is %@",create_Id);
NSLog(@"Transaction Id is %@",Transaction_Id);
NSLog(@"Selected Item array is %@",SelectedItemsArray);


NSArray *objects = [NSArray arrayWithObjects:@"bf45c093e542f057c123ae7d6",TruckIdStr,DriverIdStr,Member_id,amount,GrandTotalString,vendor_id,delivery_date,RcvdAddressId,create_Id,Transaction_Id,SelectedItemsArray, nil];

NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
    NSLog(@"Dictionary is %@",dictionary);

在控制台区域它显示 nslog 值：

 Truck Id Str is 
 Driver Id is (null)
 Member Id is 269
 Amount is 10
 Grand Total is 30.06
 Vendor Id is 447
 delivery date is 2017/07/21
 Address Id is 37
 Create Id is 2017-07-21T05:43:06Z
 Transaction Id is PAY-1RA1614620154883CLFYZI2Q
 Selected Item array is (
        {
        TotalPrice = "0.06";
        UnitPrice = "0.02";
        VendorId = 447;
        itemId = 75;
        itemQuantity = 3;
        name = "Green-Chile Burgers with Fried Eggs";
    },
        {
        TotalPrice = 30;
        UnitPrice = 10;
        VendorId = 447;
        itemId = 77;
        itemQuantity = 3;
        name = TestRohit11;
    }
)

Answer 1

这是由于 NULL 值。

这是您的应用程序崩溃的代码：

 NSArray *keys = [NSArray arrayWithObjects: @"api_key", @"truck_id",@"driver_id", @"member_id",@"amount",@"net_amount",@"vendor_id",@"delivery_date",@"address_id", @"create_Id", @"transaction_id",@"Cart_Details", nil];

//    @"DriverIdStr"
    NSArray *objects = [NSArray arrayWithObjects:@"bf45c093e542f057c123ae7d6",@"TruckIdStr",NULL,@"Member_id",@"amount",@"GrandTotalString",@"vendor_id",@"delivery_date",@"RcvdAddressId",@"create_Id",@"Transaction_Id",@"SelectedItemsArray", nil];

如果我给出 NULL ，我的应用程序就会崩溃。

正确代码：

NSArray *objects = [NSArray arrayWithObjects:@"bf45c093e542f057c123ae7d6",@"TruckIdStr",@"DriverIdStr",@"Member_id",@"amount",@"GrandTotalString",@"vendor_id",@"delivery_date",@"RcvdAddressId",@"create_Id",@"Transaction_Id",@"SelectedItemsArray", nil];

如果里面有NULL，需要替换成空白字符串。

将 NULL 字符串替换为空白：

  NSString* strValue = NULL;
if (strValue == nil || strValue == (id)[NSNull null]) {
    // Set Blank to string
    strValue = @"";
} else {
    // You don't have NULL in your string, so you can use it directly
}