iphone - 'NSInvalidArgumentException'，原因 : 'Unable to parse the format string "title contains[cd] @ %"' Error

Question

我正在尝试创建谓词，但出现错误。我收到错误“NSInvalidArgumentException”，原因:“无法解析格式字符串“title contains[cd] @%””我试过这样:

request.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"title" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)]];
NSString *predicateString=[NSString stringWithFormat:@"title contains[cd] @% ",searchText];
request.predicate = [NSPredicate predicateWithFormat:predicateString];//error here

像这样

request.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"title" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)]];
request.predicate = [NSPredicate predicateWithFormat:@"title contains[cd] @%",searchText];//error here

Answer 1

你的意思是 %@，而不是 @%，作为对象的格式说明符。