如何让NSJSONSerialization输出一个布尔值为true或false?

I'm using NSJSONSerialization dataWithJSONObject to serialize my classes to JSON. When it serializes a BOOL, it gives it the value 1 or 0 in the JSON string. I need this to be true or false instead. Is this possible to do generically?

我使用NSJSONSerialization dataWithJSONObject将类序列化为JSON。当它序列化BOOL时，它会在JSON字符串中给它值1或0。我需要这个为真或为假。这可能是一般的吗?

6 个解决方案

#1

No, the Foundation Object for a Bool is NSNumber numberWithBool, which becomes either 0 or 1. We have no Bool Object. Same go for reading JSON. True/false will become a NSNumber again.

不，Bool的基对象是NSNumber withbool，它要么是0，要么是1。我们没有Bool对象。读取JSON也是一样。True/false将再次成为NSNumber。

You could create an Bool Class and build your own parser. Arrays are Arrays and JSON Objects are NSDictionary. You can query the keys, test what Class lies behind and build the JSON String from this.

您可以创建一个Bool类并构建自己的解析器。数组是数组，JSON对象是NSDictionary。您可以查询键，测试后面的类，并从中构建JSON字符串。

#2

When I create [NSNumber numberWithBool:NO], the NSJSONSerialization returns the word "false" in the JSON string.

当我创建[NSNumber withbool:NO]时，NSJSONSerialization返回JSON字符串中的单词“false”。

EDIT With the new shortcuts you can also use these handy guys:

使用新的快捷方式进行编辑，你也可以使用这些方便的工具:

@(YES) /   @(NO)
@(1)   /   @(0)
@YES   /   @NO
@1     /   @0

This way you can avoid something like looping through your values. I want the exact opposite behavior but have NSNumber objects. So I have to loop...

通过这种方式，您可以避免像循环遍历您的值这样的事情。我想要完全相反的行为但是有NSNumber对象。所以我要循环…

EDIT II

编辑二世

mbi pointed out in the comments that there is a difference between iOS versions. So here is an iOS9 test:

mbi在评论中指出，iOS版本之间存在差异。这是iOS9测试:

NSDictionary *data = @{
    @"a": @(YES),
    @"b": @YES,
    @"c": @(1),
    @"d": @1
};
NSLog(@"%@", [[NSString alloc] initWithData:[NSJSONSerialization dataWithJSONObject:data options:0 error:nil] encoding:NSUTF8StringEncoding]);

2016-07-05 02:23:43.964 Test App[24581:6231996] {"a":true,"b":true,"c":1,"d":1}

#3

Just ran across this myself, not sure if this is the best answer but...

我自己也遇到过，不知道这是不是最好的答案，但是……

Make sure to use @YES or @NO, then your outputted json will have true / false in it:

确保使用@YES或@NO，那么输出的json将包含true / false:

[NSJSONSerialization dataWithJSONObject:@{@"test": @YES} options:0 error: nil];

So you will have to turn your other "booleans" / boolean like values -> @YES / @NO when putting into the dictionary for dataWithJSONObject.

因此，当您将数据绑定到dataWithJSONObject的字典中时，您将不得不将另一个“布尔值”/布尔值—> @YES / @NO。

[NSJSONSerialization dataWithJSONObject:@{@"test": (boolLikeValue ? @YES : @NO)} options:0 error: nil];

#4

Yes, it is possible to output a boolean (true/false) with NSJSONSerialization by using kCFBooleanTrue and kCFBooleanFalse :

是的，可以使用kCFBooleanTrue和kCFBooleanFalse输出带有NSJSONSerialization的布尔(true/false):

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:kCFBooleanTrue, @"key_1",
                           kCFBooleanFalse, @"key_2",
                           nil]

then

然后

NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:kNilOptions error:&error];

#5

I just hit the issue on iOS9. My case is that I have a CoreData property workout.private which is bool mapped to NSNumber* due to CoreData handling.

我刚刚谈到iOS9。我的情况是我有一个CoreData属性测试。private，由于CoreData处理而映射到NSNumber*的bool。

When creating JSON [NSNumber numberWithBool:workout.private.boolValue] sets expected true/false in JSON, but just workout.private or @(workout.private.boolValue) sets "1" or "0".

创建JSON时[NSNumber withbool:workout.private]。在JSON中设置期望的真/假，但只是测试。private或@(workout.privat . boolvalue)设置“1”或“0”。

#6

I ran into similar issue when using CoreData's boolean, which is stored as NSNumber too. The easiest solution for me was using @():

我在使用CoreData的boolean时遇到了类似的问题，它也存储为NSNumber。对我来说最简单的解决方法是使用@():

[NSJSONSerialization dataWithJSONObject:@{@"bool": @([object.value boolValue])} options:0 error: nil];

I guess @() does recognize the BOOL value and initialize the NSNumber with numberWithBool: which leads to true/false in JSON

我猜@()确实识别BOOL值并用numberWithBool:初始化NSNumber，这导致JSON中的true/false

#1