我在NSArray中遇到麻烦。
这是我的代码
db = [[BrowserController currentBrowser] databaseOutline];
int rowNumber = [db numberOfRows];
int i = 0;
if (rowNumber > 0 && i <= rowNumber)
{
while ([resultSet next])
{
NSDictionary *infos = [resultSet resultDictionary];
for (NSString *field in fields)
{
NSLog(@"field = %@", field);
NSString *zID = nil;
if ([field isEqualToString:@"ZSTUDY.ZID"])
{
zID = [infos objectForKey:[self.fieldsName objectForKey:field]];
}
NSManagedObject *curObj = [db itemAtRow:i++];
NSLog(@"i = %d", i);
NSString *browserID = [curObj valueForKey:@"StudyID"];
//NSString *key = [[[db sortDescriptors] objectAtIndex:0]key];
// NSLog(@"key = %@", key);
if ([zID isEqualToString:browserID])
{
NSLog(@"They are the same");
if ([field isEqualToString:@"ZSERIES.ZDATE"] || [field isEqualToString:@"ZSERIES.ZDATEADDED"] || [field isEqualToString:@"ZSERIES.ZDATEOPENED"]) {
NSNumber *number = [infos objectForKey:[self.fieldsName objectForKey:field]];
if (number && ![number isKindOfClass:[NSNull class]])
{
int result = [number intValue] + 11324*(60*60*24);
NSDate *date = [NSDate dateWithTimeIntervalSince1970:result];
[csvWriter writeField:date];
}
else
{
[csvWriter writeField:@""];
}
}
else
{
NSString *queryResult= [infos objectForKey:[self.fieldsName objectForKey:field]];
NSLog(@"result = %@", queryResult);
if (queryResult && ![queryResult isKindOfClass:[NSNull class]])
{
[csvWriter writeField:queryResult];
}
else
{
[csvWriter writeField:@""];
}
}
}
else
{
NSLog(@"They are different");
break;
}
}
}
[csvWriter writeLine];
}
[csvWriter closeFile];
[csvWriter release];
[database close];
}
}];
Fyi:我试图比较两个NSString *,
NSString zID* = [infos objectForKey:[self.fieldsName objectForKey:field]];
和
NSString *browserID = [curObj valueForKey:@"StudyID"];
这些是数据库和我的视图之间的链接。我想将数据库导出到.csv文件中,但仅当项目当前出现在视图上时。
为此,我从视图中取出了一个字段,并从数据库中获取了相同的字段。他们的字段名称不同,这就是我这样做的原因。
算法很简单,我在
中选择了我视图中的第一项NSManagedObject *curObj = [db itemAtRow:i];
我想通过NSArray *字段
for (NSString *field in fields)
但是,NSString *字段始终具有相同的值,这是我的NSArray *字段中包含的第一个值。
这是输出:
2015-11-18 12:22:37.655 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.655 Hidden[38468:400889] i = 1
2015-11-18 12:22:37.657 Hidden[38468:400889] They are different
2015-11-18 12:22:37.657 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.657 Hidden[38468:400889] i = 2
2015-11-18 12:22:37.658 Hidden[38468:400889] They are different
2015-11-18 12:22:37.659 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.659 Hidden[38468:400889] i = 3
2015-11-18 12:22:37.660 Hidden[38468:400889] They are different
2015-11-18 12:22:37.660 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.660 Hidden[38468:400889] i = 4
2015-11-18 12:22:37.668 Hidden[38468:400889] They are different
2015-11-18 12:22:37.668 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.668 Hidden[38468:400889] i = 5
2015-11-18 12:22:37.793 Hidden[38468:400889] They are different
2015-11-18 12:22:37.794 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.794 Hidden[38468:400889] i = 6
2015-11-18 12:22:37.796 Hidden[38468:400889] They are different
2015-11-18 12:22:37.796 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.796 Hidden[38468:400889] i = 7
2015-11-18 12:22:37.830 Hidden[38468:400889] They are different
2015-11-18 12:22:37.831 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.831 Hidden[38468:400889] i = 8
2015-11-18 12:22:37.833 Hidden[38468:400889] They are different
2015-11-18 12:22:37.833 Hidden[38468:400889] field = ZSERIES.ZSTUDY
2015-11-18 12:22:37.833 Hidden[38468:400889] i = 9
我做错了什么?
如果你们要求它,我会添加更多信息。
感谢。
答案 0 :(得分:0)
curObj
的值未更新,因为迭代器i
的值在代码中的任何位置都没有更改。它始终为0,初始化为i=0
。
更改此行,如下所示:
NSManagedObject *curObj = [db itemAtRow:i++];
答案 1 :(得分:0)
实际上,我的问题是break语句。
删除它,现在我的NSArray *完美循环。