[英]How to reload my view in iOS
I have a imageView embedded in a scrollView. 我有一个imageView嵌入在scrollView中。 The imageView needs to be downloaded from the Internet (through flickr api), so I add a thread to handle this.
需要从Internet(通过flickr api)下载imageView,因此我添加了一个线程来处理此问题。 But what am I supposed to do after I finished downloading the image?
但是,下载完图像后我该怎么办? How can I reload my imageView?Here's my code.
如何重新加载imageView?这是我的代码。
In fact, it is working fine. 实际上,它工作正常。 but the imageView's size is (0, 0).
但imageView的大小为(0,0)。 How can I fix that?
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];
}
The usual way is to call: 通常的方法是致电:
[self.imageView setNeedsDisplay];
Edited to Add: 编辑添加:
I just realized you said the image view is still (0,0). 我刚刚意识到您说图像视图仍然是(0,0)。 From the docs :
从文档 :
Setting the image property does not change the size of a UIImageView.
设置image属性不会更改UIImageView的大小。 Call sizeToFit to adjust the size of the view to match the image.
调用sizeToFit调整视图的大小以匹配图像。
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