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<分区>
我正在 parse.com 上的后端查询一个名为 messages 的 NSArray 类型对象,如下所示:
self.messages = (
"<lean: 0x7fcf98665140, objectId: vglE1UJ5KI, localId: (null)> {\n messageBody = Jj;\n recipientId = XvvxETqjph;\n senderId = XvvxETqjph;\n timestamp = \"1424991590106.210938\";\n}",
"<lean: 0x7fcf98667940, objectId: rgBFYBMKlU, localId: (null)> {\n messageBody = \"test 3 from ian\";\n recipientId = XvvxETqjph;\n senderId = Hoy7UjLzOh;\n timestamp = \"1424631667110.638184\";\n}",
"<lean: 0x7fcf98667f30, objectId: hB5uhwsYsu, localId: (null)> {\n messageBody = \"test 2 from user1\";\n recipientId = XvvxETqjph;\n senderId = VQzxWbDnal;\n timestamp = \"1424630904935.162109\";\n}",
"<lean: 0x7fcf986685b0, objectId: dOe2B9oq5b, localId: (null)> {\n messageBody = \"test 1\";\n recipientId = XvvxETqjph;\n senderId = XvvxETqjph;\n timestamp = \"1424630808309.478027\";\n}"
)
所以它基本上是一个字典对象数组。如何将其重新格式化为正常的字典数组,如下所示:
self.messages = (
"{\n objectId: vglE1UJ5KI;\n messageBody = Jj;\n recipientId = XvvxETqjph;\n senderId = XvvxETqjph;\n timestamp = \"1424991590106.210938\";\n}",
"{\n objectId: rgBFYBMKlU;\n messageBody = \"test 3 from ian\";\n recipientId = XvvxETqjph;\n senderId = Hoy7UjLzOh;\n timestamp = \"1424631667110.638184\";\n}",
"{\n objectId: hB5uhwsYsu;\n messageBody = \"test 2 from user1\";\n recipientId = XvvxETqjph;\n senderId = VQzxWbDnal;\n timestamp = \"1424630904935.162109\";\n}",
"{\n objectId: dOe2B9oq5b;\n messageBody = \"test 1\";\n recipientId = XvvxETqjph;\n senderId = XvvxETqjph;\n timestamp = \"1424630808309.478027\";\n}"
)
最佳答案
从解析返回的 PFObject 非常像字典,因为它响应 allKeys
和 objectForKey:
和 setObject:forKey:
, 等等。我见过几个提问者对 PFObject 实现 description
的方式以及它在控制台上的打印方式感到困惑,使它看起来不像一本字典,而不是它应该的。
无论如何,如果出于某种原因,人们确实必须拥有一个 NSDictionaries 的 NSArray,而不是一个类似字典的对象的 NSArray,那么他们可以使用如下代码:
- (NSDictionary *)dictionaryFromPFObject:(PFObject *)pfObject {
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
for (NSString *key in [pfObject allKeys]) {
dictionary[key] = [pfObject objectForKey:key];
}
return dictionary;
}
...并从查找完成 block 中调用它,如下所示:
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSMutableArray *array = [NSMutableArray array];
for (PFObject *pfObject in objects) {
[array addObject:[self dictionaryFromPFObject:pfObject]];
}
}
}];
关于ios - 如何重构对象数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29086928/
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