Question

将PFFile传递给新视图时，我要么没有图像，要么图像错误。

这是prepareForSegue方法

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([[segue identifier] isEqualToString:@"ShowWine"]) {

        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        PFObject *object = [self.objects objectAtIndex:indexPath.row];
        PFFile *file = [object objectForKey:@"image"];
        [[segue destinationViewController] setFile:file];

    }
}

我的相关实现文件的其余部分，我只是认为我没有在右边的部分找到正确的行？

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return self.sections.allKeys.count;
}


- (NSString *)wineTypeForSection:(NSInteger)section {
    return [self.sectionToWineTypeMap objectForKey:[NSNumber numberWithInt:section]];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSString *wineType = [self wineTypeForSection:section];
    NSArray *rowIndecesInSection = [self.sections objectForKey:wineType]; return  rowIndecesInSection.count;
}

- (void)objectsDidLoad:(NSError *)error {
    [super objectsDidLoad:error];

    [self.sections removeAllObjects];
    [self.sectionToWineTypeMap removeAllObjects];

    NSInteger section = 0;
    NSInteger rowIndex = 0;
    for (PFObject *object in self.objects) {
        NSString *wineType = [object objectForKey:@"wineType"];
        NSMutableArray *objectsInSection = [self.sections objectForKey:wineType];
        if (!objectsInSection) {
            objectsInSection = [NSMutableArray array];

            [self.sectionToWineTypeMap setObject:wineType forKey:[NSNumber numberWithInt:section++]];
        }

        [objectsInSection addObject:[NSNumber numberWithInt:rowIndex++]];
        [self.sections setObject:objectsInSection forKey:wineType];
    }
}

- (PFObject *)objectAtIndexPath:(NSIndexPath *)indexPath {
    NSString *wineType = [self wineTypeForSection:indexPath.section];

    NSArray *rowIndecesInSection = [self.sections objectForKey:wineType];

    NSNumber *rowIndex = [rowIndecesInSection objectAtIndex:indexPath.row];
    return [self.objects objectAtIndex:[rowIndex intValue]];
}

Answer 1

您应该尝试做的事情如下：

创建实例变量（PFFile * aFile）
在didSelectRowAtIndexPath:中，调用objectAtIndexPath:方法，并使用返回值设置aFile
仍然在didSelectRowAtIndexPath:，请致电performSegueWithIdentifier:并在prepareForSegue:，只需将目标文件设置为var：[[segue destinationViewController] setFile: aFile];。

试试这个，看看它是否效果更好。如果没有，请告诉我！

prepareForSegue没有传递正确的PFFile

1 个答案: