NSpredicate与日期

Question

我有这个问题：

我想使用NSMutableArray过滤NSPredicate，但会返回此错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString timeIntervalSinceReferenceDate]: unrecognized selector sent to instance 0xfc7f950'

我的代码：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];

NSPredicate *pred = [NSPredicate predicateWithFormat:[NSString stringWithFormat: @"dataGiorno >= '%@'",[dateFormatter dateFromString:@"31-12-2013"]]];

NSArray *filtered = [lista filteredArrayUsingPredicate:pred];

我的数据库行：

Row DB

谢谢！

解

NSDateFormatter * dateFormatter = [[NSDateFormatter alloc ] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate* firstDate = [dateFormatter dateFromString:[NSString stringWithFormat:@"%@ 00:00:00",@"2013-01-01" ]];
NSDate* secondDate = [dateFormatter dateFromString:[NSString stringWithFormat:@"%@ 23:59:59",@"2013-12-31" ]];
NSPredicate *firstPredicate = [NSPredicate predicateWithFormat:@"dataGiorno >= %@", firstDate];
NSPredicate *secondPredicate = [NSPredicate predicateWithFormat:@"dataGiorno <= %@", secondDate];
NSPredicate *newCondition = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:firstPredicate, secondPredicate,nil]];
NSArray *filtered = [lista filteredArrayUsingPredicate:newCondition];
[dateFormatter release];

全部谢谢

Answer 1

Juste取代这一行：

NSPredicate *pred = [NSPredicate predicateWithFormat:[NSString stringWithFormat: @"dataGiorno >= '%@'",[dateFormatter dateFromString:@"31-12-2013"]]];

有了这个：

NSPredicate *pred = [NSPredicate predicateWithFormat:@"dataGiorno >= '%@'",[dateFormatter dateFromString:@"31-12-2013"]];

此处无需使用额外的NSString。