我将json响应存储在NSDictionary中，并且此字典包含各种array，因此我想用@""空字符串替换所有空值。
{
Specialities = (
{
ApprovalStatus = Unapproved;
CurrencyCode = "<null>";
Packages = (
{
AssetId = 157965;
BasePrice = 10000;
BookingAdvance = 100;
Currency = INR;
Details = "<null>";
DiscountedPrice = 9000;
Id = 16579;
IsBestOffer = 1;
IsPopular = 1;
LineItems = (
{
IconClass = "fa-check";
Text = "A DVD with all edited and unedited images";
}
);
PackageVersion = 123955;
PriceUnit = 3;
Quantity = 4;
SpecialityId = 22;
Status = Rejected;
Tags = (
53
);
TermsAndConditions = "<null>";
Title = Test;
}
);
Photos = (
157965,
157964
);
ServiceDescription = 43534;
Speciality = 22;
SpecialityName = "Wedding Photographer";
UserFRPs = (
{
AssetId = 157965;
CurrencyCode = INR;
DiscountedPrice = 800;
FRPId = 13;
Id = 4559;
Price = 1000;
SpecialityId = 22;
Status = Active;
},
{
AssetId = 565441;
CurrencyCode = INR;
DiscountedPrice = 9000;
FRPId = 18;
Id = 5559;
Price = 10000;
SpecialityId = 22;
Status = Active;
}
);
Videos = (
{
VideoId = DaWOguXZbNA;
VideoLink = "http://www.youtube.com/watch?v=DaWOguXZbNA";
VideoType = YouTube;
},
{
VideoId = DGVJtAHzzDQ;
VideoLink = "http://www.youtube.com/watch?v=DGVJtAHzzDQ";
VideoType = YouTube;
},
{
VideoId = "_zxKLZR-xuk";
VideoLink = "http://www.youtube.com/watch?v=_zxKLZR-xuk";
VideoType = YouTube;
},
{
VideoId = 5SkBZcvuuQs;
VideoLink = "http://www.youtube.com/watch?v=5SkBZcvuuQs";
VideoType = YouTube;
},
{
VideoId = "H_Xi-lVB4Zw";
VideoLink = "http://www.youtube.com/watch?v=H_Xi-lVB4Zw";
VideoType = YouTube;
},
{
VideoId = TWhSjpsGvPQ;
VideoLink = "http://www.youtube.com/watch?v=TWhSjpsGvPQ";
VideoType = YouTube;
},
{
VideoId = N2CJrhHEydA;
VideoLink = "http://www.youtube.com/watch?v=N2CJrhHEydA";
VideoType = YouTube;
},
{
VideoId = Lq6faQVYcwY;
VideoLink = "http://www.youtube.com/watch?v=Lq6faQVYcwY";
VideoType = YouTube;
},
{
VideoId = v8WjMiodcKo;
VideoLink = "http://www.youtube.com/watch?v=v8WjMiodcKo";
VideoType = YouTube;
}
);
},
{
ApprovalStatus = Unapproved;
CurrencyCode = "<null>";
Packages = "<null>";
Photos = (
157967
);
ServiceDescription = Ddhd;
Speciality = 37;
SpecialityName = "Hair and Makeup Stylist";
UserFRPs = (
{
AssetId = 157967;
CurrencyCode = INR;
DiscountedPrice = 900;
FRPId = 34;
Id = 4560;
Price = 1000;
SpecialityId = 37;
Status = Active;
}
);
Videos = (
{
VideoId = "onvkllwM-OI";
VideoLink = "http://www.youtube.com/watch?v=onvkllwM-OI";
VideoType = YouTube;
},
{
VideoId = "_-cRVdTW2s8";
VideoLink = "http://www.youtube.com/watch?v=_-cRVdTW2s8";
VideoType = YouTube;
},
{
VideoId = DGVJtAHzzDQ;
VideoLink = "http://www.youtube.com/watch?v=DGVJtAHzzDQ";
VideoType = YouTube;
}
);
},
{
ApprovalStatus = Unapproved;
CurrencyCode = "<null>";
Packages = "<null>";
Photos = (
157963,
157962,
157961
);
ServiceDescription = Test;
Speciality = 55;
SpecialityName = Transport;
UserFRPs = "<null>";
Videos = (
{
VideoId = "cRchvv_dB2c";
VideoLink = "http://www.youtube.com/watch?v=cRchvv_dB2c";
VideoType = YouTube;
},
{
VideoId = "onvkllwM-OI";
VideoLink = "http://www.youtube.com/watch?v=onvkllwM-OI";
VideoType = YouTube;
},
{
VideoId = DGVJtAHzzDQ;
VideoLink = "http://www.youtube.com/watch?v=DGVJtAHzzDQ";
VideoType = YouTube;
}
);
},
{
ApprovalStatus = Unapproved;
CurrencyCode = "<null>";
Packages = "<null>";
Photos = "<null>";
ServiceDescription = Baby;
Speciality = 5;
SpecialityName = "Children/Babies Photographer";
UserFRPs = "<null>";
Videos = (
{
VideoId = "cRchvv_dB2c";
VideoLink = "http://www.youtube.com/watch?v=cRchvv_dB2c";
VideoType = YouTube;
},
{
VideoId = DGVJtAHzzDQ;
VideoLink = "http://www.youtube.com/watch?v=DGVJtAHzzDQ";
VideoType = YouTube;
}
);
},
}
我希望所有空值都替换为空字符串。
答案 0 :(得分：1)
然后就这样做
NSString *json = [[NSString alloc] initWithData:[NSJSONSerialization dataWithJSONObject:yourDictionary options:0 error:nil] encoding: NSUTF8StringEncoding];
NSString *jsonWithoutNulls = [json stringByReplacingOccurrencesOfString:@"<null>" withString:@""];
NSData *data = [jsonWithoutNulls dataUsingEncoding:NSUTF8StringEncoding]
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
答案 1 :(得分：0)
我更喜欢使用宏来确定空值。
#define IS_NULL(value) (value != nil && value != Nil && value != NULL && value != (id)[NSNull null])
我像
一样调用它if (IS_NULL(CurrencyCode))
{
//insert ""
}else
{
//do necessary updates
}
或者你也可以使用以下方法，
-(BOOL) isNull: (NSString*)value{
if ([value isEqualToString:@"<null>"]){
return false;
}
return true;
}
你可以调用它，
if (isNull(currencyType))
{
//insert @""
}else{
//do necessary updates
}
答案 2 :(得分：0)
试试这个是我使用的我的代码我希望它会有所帮助!!
func checkDictionary(let dict:NSMutableDictionary)
{
let keys = Array(dict.allKeys)
for i in keys
{
let checkvalue = dict.valueForKey(i as! String)
if checkvalue! .isKindOfClass(NSNull)
{
dict.setObject("", forKey: i as! NSString)
}
else if checkvalue!.isKindOfClass(NSDictionary)
{
let dic = checkvalue as! NSDictionary
let dicts = dic.mutableCopy()
self.checkDictionary(dicts as! NSMutableDictionary)
dict.setObject(dicts, forKey: i as! NSString)
}
else if checkvalue! .isKindOfClass(NSArray)
{
let keys2 = checkvalue as! NSArray
let keys1 = keys2.mutableCopy() as! NSMutableArray
dict.setObject(keys1, forKey: i as! NSString)
for j in keys1
{
if j .isKindOfClass(NSNull)
{
keys1.replaceObjectAtIndex(keys1.indexOfObject(j), withObject:"")
}
if j.isKindOfClass(NSDictionary)
{
let dic = j as! NSDictionary
let dicts = dic.mutableCopy()
keys1.replaceObjectAtIndex(keys1.indexOfObject(j), withObject: dicts)
self .checkDictionary(dicts as! NSMutableDictionary)
}
}
}
}
}
在Objective-C中尝试这个!!
-(void)CheckDictionary:(NSMutableDictionary *)dic
{
NSArray *Arr = [dic allKeys];
for (int i = 0; i<Arr.count; i++)
{
if ([[dic valueForKey:[Arr objectAtIndex:i]] isKindOfClass:[NSNull class]])
{
[dic setObject:@"" forKey:[Arr objectAtIndex:i]];
}
else if ([[dic valueForKey:[Arr objectAtIndex:i]] isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *dict = [[dic valueForKey:[Arr objectAtIndex:i]] mutableCopy];
[dic setObject:dict forKey:[Arr objectAtIndex:i]];
[self CheckDictionary:dict];
}
else if ([[dic valueForKey:[Arr objectAtIndex:i]] isKindOfClass:[NSMutableArray class]])
{
NSMutableArray *Arr12 = [dic valueForKey:[Arr objectAtIndex:i]];
for (int j = 0; j<Arr12.count; j++)
{
if ([[Arr12 objectAtIndex:j] isKindOfClass:[NSDictionary class]])
{
NSDictionary *dict123 = [Arr12 objectAtIndex:j];
NSMutableDictionary *dict = [dict123 mutableCopy];
[Arr12 replaceObjectAtIndex:j withObject:dict];
[self CheckDictionary:dict];
}
}
}
}
}
当你调用这个方法时，只需传递整个字典，我希望它会有所帮助!!
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:responseObject options: NSJSONReadingMutableContainers error: nil];
if (dictionary)
{
NSMutableDictionary *dict = [dictionary mutableCopy];
[self CheckDictionary:dict];
dictionary = [NSDictionary dictionaryWithDictionary:dict];
}
答案 3 :(得分：0)
这就是我们这样做的方式
NSString *style = @"<style> body { font-family: Avenir; font-size: 18px; color: blue; } p:last-of-type { margin: 0; }</style>";
NSString *html = @"<p>A whole bunch of sample text goes right here.</p><p>Now here's another paragraph that unfortunately has an extra line underneath the text adding undesired padding to the label. :(</p>";
NSString *styledHtml = [NSString stringWithFormat:@"%@%@", style, html];
self.label.attributedText = [[NSMutableAttributedString alloc] initWithData:[styledHtml dataUsingEncoding:NSUTF8StringEncoding] options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType} documentAttributes:nil error:nil];
答案 4 :(得分：0)
您可以在此处使用的短代码： -
NSString * newValue=[self isNotNull:[your Object here]] ? [your Object here] : @"Value that you want to replace";
- (BOOL)isNull:(NSObject *)object {
if (!object) return YES;
else if (object == [NSNull null]) return YES;
else if ([object isKindOfClass:[NSString class]]) {
return ([((NSString *)object)isEqualToString : @""]
|| [((NSString *)object)isEqualToString : @"null"]
|| [((NSString *)object)isEqualToString : @"<null>"]
|| [((NSString *)object)isEqualToString : @"(null)"]
);
}
return NO;
}
- (BOOL)isNotNull:(NSObject *)object {
return ![self isNull:object];
}