iCarousel + Parse：从 PFObject 加载异步图像

Posted 2023-03-10

【中文标题】iCarousel + Parse：从 PFObject 加载异步图像

【英文标题】：iCarousel + Parse: Loading Async Images from PFObject

【发布时间】：2014-02-07 21:39:53

【问题描述】：

我正在尝试使用 parse (parse.com, pfoject) 对象填充 iCarousel，但没有成功。

我找不到任何如何做到这一点的例子，所以这就是我在这里问的原因......

- (void)viewDidLoad

    [super viewDidLoad];

_items = [NSMutableArray array];

PFQuery *query = [PFQuery queryWithClassName:@"testUser"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) 
    if (!error) 
        // The find succeeded. The first 100 objects are available in objects
        [_items addObjectsFromArray:objects];

     else 
        // Log details of the failure
        NSLog(@"Error: %@ %@", error, [error userInfo]);
    
];


//configure carousel
_carousel.type = iCarouselTypeRotary;

//_carousel.viewpointOffset = CGSizeMake(0.0f, 100.0f);
[_carousel setContentOffset:CGSizeMake(0.0f, -60.0f)];

在 viewForItemAtIndex:

- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view

    //create new view if no view is available for recycling
    if (view == nil)
    
        view = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 300.0f, 300.0f)];
    

PFObject *eachObject = [_items objectAtIndex:index];
PFFile *theImage = [eachObject objectForKey:@"image"];
NSData *imageData = [theImage getData];
UIImage *image = [UIImage imageWithData:imageData];

((UIImageView *)view).image = image;
view.contentMode = UIViewContentModeCenter;

return view;

请问，有什么帮助吗？ :-(

【参考方案1】：

在viewDidLoad之后

   [_items addObjectsFromArray:objects];

放

 [_carousel reloadData];

否则在将项目添加到数组后轮播将不会更新，因此您仍然会看到一个空的轮播。