我在 scrollView 中嵌入了一个 imageView。 imageView 需要从网上下载(通过 flickr api)，所以我添加了一个线程来处理这个问题。但是下载完图片后我该怎么办呢？如何重新加载我的 imageView？这是我的代码。
事实上，它工作正常。但是 imageView 的大小是 (0, 0)。我该如何解决？
- (void)viewDidLoad
{
[super viewDidLoad];
if (!self.myImage)
{
UIActivityIndicatorView* spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[spinner startAnimating];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:spinner];
dispatch_queue_t downloadQueue = dispatch_queue_create("flickr downloader (photo)", NULL);
dispatch_async(downloadQueue, ^{
NSData* data = [NSData dataWithContentsOfURL:[FlickrFetcher urlForPhoto:self.photo format:FlickrPhotoFormatLarge]];
dispatch_async(dispatch_get_main_queue(), ^{
self.myImage = [UIImage imageWithData:data];
[self.imageView setImage:self.myImage];
[self viewDidLoad];
[self viewWillAppear:NO];
NSLog(@"imageViewSet!");
self.navigationItem.rightBarButtonItem = nil;
});
});
dispatch_release(downloadQueue);
}
else
{
NSString* imageTitle;
if ([[self.photo objectForKey:@"title"] length] > 0)
imageTitle = [self.photo objectForKey:@"title"];
else if ([[self.photo valueForKeyPath:@"description._content"] length] > 0)
imageTitle = [self.photo valueForKeyPath:@"description._content"];
else imageTitle = @"Unknown";
[[self navigationItem] setTitle:imageTitle];
self.scrollView.delegate = self;
self.scrollView.contentSize = self.imageView.image.size;
}
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
double scale = self.imageView.bounds.size.width * 1.0 / self.myImage.size.width;
if (scale > self.imageView.bounds.size.height * 1.0 / self.myImage.size.height)
scale = self.imageView.bounds.size.height * 1.0 / self.myImage.size.height;
NSLog(@"imgview%g, %g",self.imageView.bounds.size.width, self.imageView.bounds.size.height);
NSLog(@"img%g, %g",self.myImage.size.width, self.myImage.size.height);
self.imageView.frame = CGRectMake(0, 0, self.imageView.image.size.width, self.imageView.image.size.height);
[self.scrollView setZoomScale:scale];
}
最佳答案
通常的方式是调用:
[self.imageView setNeedsDisplay];
编辑添加:
我刚刚意识到你说 ImageView 仍然是 (0,0)。来自 the docs :
Setting the image property does not change the size of a UIImageView. Call sizeToFit to adjust the size of the view to match the image.
关于iphone - 如何在 iOS 中重新加载我的 View ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9849500/