ios [__NSCFNumber length]：无法识别的选择器发送到实例 0x6d21350
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[__NSCFNumber length]: unrecognized selector sent to instance 0x6d21350
提问by Richard Knop
What could this error mean?
这个错误意味着什么？
[__NSCFNumber length]: unrecognized selector sent to instance 0x6d21350
Here is my code:
这是我的代码：
NSString *urlString = @"http://api.twitter.com/1/statuses/update.json";
NSURL *url = [NSURL URLWithString:urlString];
NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
[params setObject:status forKey:@"status"];
[params setObject:replyToID forKey:@"in_reply_to_status_id"];
[params setObject:@"1" forKey:@"include_entities"];
// Build the request with our parameter
TWRequest *request = [[TWRequest alloc] initWithURL:url parameters:params requestMethod:TWRequestMethodPOST];
// Attach the account object to this request
[request setAccount:twitterAccount];
[request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
if (!responseData) {
// inspect the contents of error
NSLog(@"%@", [error localizedDescription]);
self.alert = [[UIAlertView alloc] initWithTitle:@"HTTP error" message:@"I could not connect to the Twitter API." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[self.alert show];
[self.replyDelegate replyRequestSuccessful:NO];
}
else {
/*NSString *responseDataAsString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(responseDataAsString);*/
NSError *error;
NSArray *replyResponse = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableLeaves error:&error];
if (!replyResponse) {
NSLog(@"%@", [error localizedDescription]);
self.alert = [[UIAlertView alloc] initWithTitle:@"JSON error" message:@"I could not parse the JSON response from the Twitter API." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[self.alert show];
[self.replyDelegate replyRequestSuccessful:NO];
}
else {
[self.replyDelegate replyRequestSuccessful:YES];
}
}
}];
I tried debuggin, and it dies once it enters the performRequestWithHandler. It goes the else block and dies with the error above.
我试过 debuggin，一旦它进入 performRequestWithHandler 就会死掉。它进入 else 块并因上述错误而死亡。
回答by zoul
It means that you are passing an NSNumberwhere the called code expects an NSStringor some other object that has a lengthmethod. You can tell Xcode to break on exceptions so that you see where exactly the lengthmethod gets called.
这意味着您正在传递一个NSNumber被调用代码需要一个NSString或其他具有length方法的对象的地方。您可以告诉 Xcode 在异常时中断，以便您查看length调用该方法的确切位置。
回答by Sau Sheong
Specifically this line of code:
特别是这行代码：
[params setObject:replyToID forKey:@"in_reply_to_status_id"];
the replyToIDis not a String or has a method length. If you don't have this, or if you convert the replyToIDto a String before setting it in params it should work.
的replyToID是不是一个字符串或有一个方法length。如果你没有这个，或者如果你replyToID在将它设置为 params 之前将它转换为一个字符串，它应该可以工作。
