用JSON响应中的空字符串替换空值在iOS中不起作用 [英] Replacing nulls with empty string from JSON response not working in iOS
本文介绍了用JSON响应中的空字符串替换空值在iOS中不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我使用下面的代码用空字符串替换json响应中的空值,但是它不起作用.请帮我解决此问题,在很多情况下和应用程序崩溃时,服务器响应都为空.
I used below code to replace nulls from json response with empty string, but it is not working. Please help me out to fix this issue, i am getting nulls from server response in lot of scenarios and App crashes.
代码:
- (NSMutableDictionary *)recursive:(NSMutableDictionary *)dictionaryResponse {
NSMutableDictionary *dictionary=[[NSMutableDictionary alloc]initWithDictionary:dictionaryResponse];
for (NSString *key in [dictionary allKeys]) {
id nullString = [dictionary objectForKey:key];
if ([nullString isKindOfClass:[NSDictionary class]]) {
[self recursive:(NSMutableDictionary*)nullString];
}else if([nullString isKindOfClass:[NSArray class]]){
for (int i=0; i<[nullString count]; i++) {
id nullstr = [nullString objectAtIndex:i];
if ([nullstr isKindOfClass:[NSDictionary class]]) {
[self recursive:(NSMutableDictionary*)nullstr];
}
}
}else {
if ((NSString*)nullString == (id)[NSNull null])
[dictionary setValue:@"" forKey:key];
}
}
return dictionary;
}
推荐答案
尝试一下:
- (NSMutableDictionary *)recursiveNullRemove:(NSMutableDictionary *)dictionaryResponse {
NSMutableDictionary *dictionary = [dictionaryResponse mutableCopy];
NSString *nullString = @"";
for (NSString *key in [dictionary allKeys]) {
id value = dictionary[key];
if ([value isKindOfClass:[NSDictionary class]]) {
dictionary[key] = [self recursiveNullRemove:(NSMutableDictionary*)value];
}else if([value isKindOfClass:[NSArray class]]){
NSMutableArray *newArray = [value mutableCopy];
for (int i = 0; i < [value count]; ++i) {
id value2 = [value objectAtIndex:i];
if ([value2 isKindOfClass:[NSDictionary class]]) {
newArray[i] = [self recursiveNullRemove:(NSMutableDictionary*)value2];
}
else if ([value2 isKindOfClass:[NSNull class]]){
newArray[i] = nullString;
}
}
dictionary[key] = newArray;
}else if ([value isKindOfClass:[NSNull class]]){
dictionary[key] = nullString;
}
}
return dictionary;
}
已编辑
我在答案中发现了问题,现在已经解决
I hase find the problem in my answer, and now it fixed
这是校验码:
NSDictionary *dict = @{@"1" : @{@"1.1": @"value", @"1.2" : [NSNull null]},
@"2" : @[@"2.1", @{@"2.2.1" : @"val", @"2.2.2" : [NSNull null]}],
@"3" : [NSNull null]};
dict = [self recursiveNullRemove:dict];
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