Question

我正在构建一个我需要比较的应用程序，如果一小时介于一个小时和最后一小时之间，我在CoreData中使用Integer64类型保存了几秒钟。为了比较这个小时，我正在使用filteredArrayUsingPredicate和这个谓词：

NSMutableArray *allDiscounts = (NSMutableArray *)[[DataStack defaultStack] fetchAllDiscounts];    
NSMutableArray *hoursResults = [[NSMutableArray alloc] init];    
    NSNumber *timeInSeconds = [[DataStack defaultStack] stringToSeconds:string];

NSLog(@"allDiscounts count: %lu",(unsigned long)[allDiscounts count]);
NSLog(@"inicial time; %@",[[allDiscounts objectAtIndex:0] inicialTime]);
NSLog(@"final time; %@",[[allDiscounts objectAtIndex:0] finalTime]);
NSLog(@"time in seconds: %d", [timeInSeconds intValue]);

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"inicialTime <= %@ AND %@ <= finalTime",timeInSeconds,timeInSeconds];
[hoursResults addObjectsFromArray:[allDiscounts filteredArrayUsingPredicate:predicate]];
NSLog(@"hoursResults count: %lu", (unsigned long)[discountResults count]);

并将结果添加到另一个NSMutableArray，但我总是得到0结果。

这是我得到的日志：

2015-03-15 16:05:09.883 Vanttage[9342:662093] allDiscounts count: 87
2015-03-15 16:05:09.883 Vanttage[9342:662093] inicial time; 68400
2015-03-15 16:05:09.883 Vanttage[9342:662093] final time; 82800
2015-03-15 16:05:09.884 Vanttage[9342:662093] time in seconds: 72000
2015-03-15 16:05:09.885 Vanttage[9342:662093] hoursResults count: 0

我做错了什么？希望你能帮助我。谢谢。

Answer 1

尝试NSPredicate *predicate = [NSPredicate predicateWithFormat:@"inicialTime <= %d AND %d <= finalTime",[timeInSeconds intValue],[timeInSeconds intValue]];假设timeInSeconds是NSNumber

filteredArrayUsingPredicate什么都不返回

1 个答案: