WKInterfaceTable didSelectRowAtIndex 中 Context 中的空值

Question

我安装了一个 watchkit table，它工作正常。但是当我尝试将 WKInterfaceTable didSelectRowAtIndex 方法与上下文应该存在的值一起使用时，上下文给出了空值。我创建的测试上下文值工作正常并且该方法工作并推送正确填充的 DetailInterfaceController。 InterfaceController.m见下面的代码：

- (void)awakeWithContext:(id)context {
[super awakeWithContext:context];

// Configure interface objects here.

    [self updateWatchTable];

}


-(void)updateWatchTable{

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Cschedule" inManagedObjectContext:[[CoreDataHelper sharedHelper] context]];

[fetchRequest setEntity:entity];

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"trueDate" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];

[fetchRequest setSortDescriptors:sortDescriptors];

NSArray *myResults = [[[CoreDataHelper sharedHelper] context] executeFetchRequest:fetchRequest error:nil];

self.objectsTable = myResults;

NSLog(@"Schedule myResults count: %lu", (unsigned long)myResults.count);

[self.table setNumberOfRows:self.objectsTable.count withRowType:@"ScheduleTableRow"];

    for (int i = 0; i < self.objectsTable.count; i++) {
        ScheduleTableRow *scheduleRow = [self.table rowControllerAtIndex:i];
        NSManagedObject *item = self.objectsTable[i];
        scheduleRow.name.text = [NSString stringWithFormat:@"%@",[item valueForKey:@"day"]];
        scheduleRow.date.text = [NSString stringWithFormat:@"%@",[item valueForKey:@"date"]];

    }

}


- (void)table:(WKInterfaceTable *)table didSelectRowAtIndex:(NSInteger)rowIndex
{
// Push detail view with selected quote

NSString * scheduleDate = [[self.objectsTable objectAtIndex:rowIndex] valueForKey:@"date"];
NSString * test = @"Feb 1 2016"; //TEST date 

[self pushControllerWithName:@"DetailScheduleInterfaceController" context:test]; //THIS WORKS WITH TEST date AND CORRECTLY PUSHES POPULATED DetailInterfaceController
//[self pushControllerWithName:@"DetailScheduleInterfaceController" context:scheduleDate]; //THIS PUSHES BLANK DetailInterfaceController SINCE scheduleDate IS NULL

NSLog(@"Count in objectsTable = %lu", (unsigned long)self.objectsTable.count);
NSLog(@"Value for scheduleDate = %@", scheduleDate); //THIS GIVES NULL VALUE
}

Answer 1

我认为您的问题是您正在将字符串分配给 NSManagedObject。尝试像在 updateWatchTable.

中的循环中那样做

在您的 didSelectRowAtIndex 方法中：

NSManagedObject *item = self.objectsTable objectAtIndex[rowIndex];
NSString * scheduleDate = [NSString stringWithFormat:@"%@",[item valueForKey:@"date"]];

Answer 2

下面的代码为我解决了这个问题。我创建了一个数组来将 MSManageObjects 存储在 for 循环中。然后在 WKInterfaceTable didSelectRowAtIndex 方法中，我在数组上做了一个 objectAtIndex: rowIndex。

[self.table setNumberOfRows:self.objectsTable.count withRowType:@"ScheduleTableRow"];

self.myNewArray = [[NSMutableArray alloc] init];

    for (int i = 0; i < self.objectsTable.count; i++) {
        ScheduleTableRow *scheduleRow = [self.table rowControllerAtIndex:i];

        NSManagedObject *item = self.objectsTable[i];
        scheduleRow.name.text = [NSString stringWithFormat:@"%@",[item valueForKey:@"day"]];
        scheduleRow.date.text = [NSString stringWithFormat:@"%@",[item valueForKey:@"date"]];
        [self.myNewArray addObject:[item valueForKey:@"date"]];
    }

- (void)table:(WKInterfaceTable *)table didSelectRowAtIndex:(NSInteger)rowIndex
{
// Push detail view with selected quote

NSString * scheduleDate = [NSString stringWithFormat:@"%@", [self.myNewArray objectAtIndex:rowIndex]];

[self pushControllerWithName:@"DetailScheduleInterfaceController" context:scheduleDate];
}

WKInterfaceTable didSelectRowAtIndex 中 Context 中的空值

Null value in Context in WKInterfaceTable didSelectRowAtIndex

objective-c

watchkit

wkinterfacetable