iphone - 'NSInvalidArgumentException'，原因：'无法解析格式字符串 "title contains[cd] @%"' 错误

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

您的意思是%@, not @%，作为对象的格式说明符。