[英]PHFetchOptions predicate with NSDate compare
您好,我曾经使用过Photos.framework
但现在我陷入了文档中PHFetchOptions
类的谓词比较的PHFetchOptions
,我发现我们可以在谓词中使用startDate
。 所以我的代码是这样
@interface ViewController ()
{
NSMutableArray * moments;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
moments = [NSMutableArray array];
if([PHPhotoLibrary authorizationStatus] == PHAuthorizationStatusNotDetermined)
{
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
[self loadCollections];
}];
}else
{
[self loadCollections];
}
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self loadCollections];
}
- (NSDate*)dateAddingDays:(NSInteger)days ToDate:(NSDate*)argDate
{
NSCalendar * gregorian = [NSCalendar currentCalendar];
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"dd.MM.yyyy"];
NSString * dateString = [formatter stringFromDate:argDate];
NSDate * toWorkDate = [formatter dateFromString:dateString];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:days];
NSDate *date = [gregorian dateByAddingComponents:comps toDate:toWorkDate options:0];
NSLog(@"%@",[formatter stringFromDate:date]);
return date;
}
- (void)loadCollections
{
PHFetchOptions * options = [[PHFetchOptions alloc]init];
options.predicate = [NSComparisonPredicate predicateWithFormat:@"startDate > CAST(%d,\"NSDate\")",[self dateAddingDays2:-1 ToDate:[NSDate date]].timeIntervalSince1970];
PHFetchResult * result = [PHAssetCollection fetchMomentsWithOptions:options];
if(result != nil)
{
NSLog(@"%i",result.count);
for (int i = 0; i < result.count; i++) {
NSLog(@"%@",[result objectAtIndex:i]);
[moments addObject:[result objectAtIndex:i]];
}
}
}
所以我的问题是,我需要从前一天获取照片,我才能完成这项工作! 任何帮助将不胜感激。
这就是答案,基本上我换了
- (NSDate*)dateAddingDays:(NSInteger)days ToDate:(NSDate*)argDate
{
NSCalendar * gregorian = [NSCalendar currentCalendar];
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"dd.MM.yyyy"];
NSString * dateString = [formatter stringFromDate:argDate];
NSDate * toWorkDate = [formatter dateFromString:dateString];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:days];
NSDate *date = [gregorian dateByAddingComponents:comps toDate:toWorkDate options:0];
NSLog(@"%@",[formatter stringFromDate:date]);
return date;
}
通过
- (NSDate*)yesterday
{
NSCalendar * gregorian = [NSCalendar currentCalendar];
return [gregorian startOfDayForDate:[gregorian dateByAddingUnit:NSCalendarUnitDay value:-1 toDate:[NSDate date] options:NSCalendarWrapComponents]];
}
并替换这个
options.predicate = [NSComparisonPredicate predicateWithFormat:@"startDate > CAST(%d,\"NSDate\")",[self dateAddingDays2:-1 ToDate:[NSDate date]].timeIntervalSince1970];
这样
options.predicate = [NSComparisonPredicate predicateWithFormat:@"(startDate > %@)",[self yesterday]];
现在正在工作!!! 感谢@Larme
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