xcode 不可接受的属性值类型：property
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9029327/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Unacceptable type of value for attribute: property
提问by priya
I created my app using Core Data, declared 2 attributes, SongLyrics and MovieSongName, both as string. Then in xib I created a text field for MovieSongName and a text view for SongLyrics. For storing these I used the following code
我使用 Core Data 创建了我的应用程序，声明了 2 个属性，SongLyrics 和 MovieSongName，两者都是字符串。然后在 xib 中，我为 MovieSongName 创建了一个文本字段，并为 SongLyrics 创建了一个文本视图。为了存储这些，我使用了以下代码
-(void)saveData
{
LyricsAppDelegate *appDelegate = [[UIApplication sharedApplication]
delegate];
NSManagedObjectContext *managedObjectContext = [appDelegate managedObjectContext];
NSEntityDescription *entityDesc = [NSEntityDescription
entityForName:@"Lyrics"
inManagedObjectContext:managedObjectContext];
NSManagedObject *LyricsObjectEnglish;
LyricsObjectEnglish = [NSEntityDescription
insertNewObjectForEntityForName:@"English_Songs"
inManagedObjectContext:managedObjectContext];
[LyricsObjectEnglish setValue:song_lyrics.text forKey:@"SongLyrics"];
[LyricsObjectEnglish setValue:song_name forKey:@"MovieSongName"];
song_lyrics.text=@"";
song_name.text=@"";
NSError *error;
[managedObjectContext save:&error];
}
when clicking on the save button app gets aborted with the following error.
单击保存按钮时，应用程序因以下错误而中止。
2012-01-27 10:50:52.071 Lyrics[4624:207] *Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property = "MovieSongName"; desired type = NSString; given type = UITextField; value = >.'
2012-01-27 10:50:52.071 歌词[4624:207] *由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“不可接受的属性值类型：property =“MovieSongName”；所需类型 = NSString; 给定类型 = UITextField; 值 = >.'
Can any one help me? I'm using Core Data for the first time and I'm a little confused.
谁能帮我？我是第一次使用 Core Data，我有点困惑。
回答by UIAdam
The error is telling you exactly what the problem is. Specifically, MovieSongName needs an NSStringvalue, but the value you are giving it is a UITextFieldbecause you are trying to give it song_namerather than song_name.text.
该错误准确地告诉您问题是什么。具体来说， MovieSongName 需要一个NSString值，但您赋予它的值是 aUITextField因为您试图赋予它song_name而不是song_name.text。
The correct code is:
正确的代码是：
[LyricsObjectEnglish setValue:song_name.text forKey:@"MovieSongName"];
