SBJsonParser 的问题
我的 iPhone 应用程序正在从我的 Web 服务接收此 json 字符串：
{"res":true,"users":[{"id":"79","username":""},{"id":"81","username":""},{"id":"83","username":""},{"id":"80","username":""},{"id":"82","username":""}]}
我使用以下代码处理它：
SBJsonParser *jsonParser = [[SBJsonParser alloc] init];
NSError *error = nil;
NSDictionary *dictionary = [jsonParser objectWithString:responseString error:&error];
其中 responseString 是通过 JSON 接收的字符串。
现在，如果我检查 [[dictionary valueForKey:@"res"] boolValue] 它是正确的布尔值。 问题在于 [dictionary objectForKey:@"users"] 我不明白它是什么类型的对象。
我也尝试这样做：
NSLog(@"Is of type NSString?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSString class]])? @"Yes" : @"No");
NSLog(@"Is of type NSArray?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSArray class]])? @"Yes" : @"No");
NSLog(@"Is of type NSMutableArray?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSMutableArray class]])? @"Yes" : @"No");
NSLog(@"Is of type NSDictionary?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSDictionary class]])? @"Yes" : @"No");
NSLog(@"Is of type NSMutableDictionary?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSMutableDictionary class]])? @"Yes" : @"No");
但它总是说否。
感谢您的帮助。
my iPhone application is receiving from my web service this json string:
{"res":true,"users":[{"id":"79","username":""},{"id":"81","username":""},{"id":"83","username":""},{"id":"80","username":""},{"id":"82","username":""}]}
I'm handling it with the following code:
SBJsonParser *jsonParser = [[SBJsonParser alloc] init];
NSError *error = nil;
NSDictionary *dictionary = [jsonParser objectWithString:responseString error:&error];
where responseString is the string received with the JSON.
Now if i check for [[dictionary valueForKey:@"res"] boolValue] it is correctly a boolean.
The problem is with [dictionary objectForKey:@"users"] I don't understand what kind of object it is.
I try also with this:
NSLog(@"Is of type NSString?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSString class]])? @"Yes" : @"No");
NSLog(@"Is of type NSArray?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSArray class]])? @"Yes" : @"No");
NSLog(@"Is of type NSMutableArray?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSMutableArray class]])? @"Yes" : @"No");
NSLog(@"Is of type NSDictionary?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSDictionary class]])? @"Yes" : @"No");
NSLog(@"Is of type NSMutableDictionary?: %@", ([[dictionary objectForKey:@"users"] isMemberOfClass:[NSMutableDictionary class]])? @"Yes" : @"No");
but it always says No.
Thank you for your help.
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您应该使用
isKindOfClass:而不是isMemberOfClass:因为集合通常在 Cocoa 中实现为类簇。另外，
NSLog(@"%@", NSStringFromClass([[dictionary objectForKey:@"users"] class]))的编写比单独检查每个可能的类要短得多。You should use
isKindOfClass:instead ofisMemberOfClass:because collections are usually implemented as class clusters in Cocoa.Also,
NSLog(@"%@", NSStringFromClass([[dictionary objectForKey:@"users"] class]))is much shorter to write than checking every possible class individually.