将NSNumber 0添加到NSDictionary

Question

我需要根据ID创建一个用于搜索的字典，但如果没有选择ID，则必须存储0。

现在我可以这样做：

NSNumber* cityID;
NSNumber* zoneID; //These two do get value, just showing for their class
NSDictionary *cityDictionary = @{@"CityID": [NSNumber numberWithInt:(int)cityId], @"CityZoneID": [NSNumber numberWithInt:(int)zoneId]};

我觉得这样真的很乱。它会被转换为int，然后转回NSNumber ...

Answer 1

试试这个

// May be syntax change but you need to initialise with zero first
NSNumber* cityID = [NSNumber numberWithInt:0];
NSNumber* zoneID = [NSNumber numberWithInt:0]; //Init with Zero then you can added value for this if no value default will be 0
NSDictionary *cityDictionary = @{@"CityID": [NSNumber numberWithInt:(int)cityId], @"CityZoneID": [NSNumber numberWithInt:(int)zoneId]};

这可能会有所帮助

Answer 2

NSNumber* cityID;
NSNumber* zoneID;
if((cityID == nil)||(zoneID == nil))
{
    NSDictionary *cityDictionary = @{@"CityID": [NSNumber numberWithInt:0], @"CityZoneID": [NSNumber numberWithInt:0]};
}

Answer 3

怎么样？

NSDictionary *cityDictionary = @{
      @"CityID" :     (cityID == nil ? @0 : cityID),
      @"CityZoneID" : (zoneID == nil ? @0 : zoneID)
};