我有一個scrollView,我在主線程中添加了一些UIButtons和UIActivityIndicators。 然後我執行一個[NSThread detachSelectorInBackground:@selector(getImages)toTarget:self withObject:nil];將UIImageView添加到後臺線程中的UIScrollView,不會顯示直到全部添加
getImages下載一些圖像並將它們添加到UIImageView中,然後將UIImageView添加到scrollView,但它們不會顯示,直到方法getImages完成。 有什麼辦法讓scrollView重繪或刷新或類似的東西?
AND 如果我在getImages方法中滾動scrollView(用我的手指......),已添加的UIImageView將顯示出來。
- (void) getImages {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int x=5;
int y=0;
NSData *imgData;
UIImage *img;
UIImageView *imgView;
for (NSDictionary *tmp in thumbs) {
imgData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[Functions urlForFile:[tmp objectForKey:@"img"]]]];
if ([imgData length] > 0) {
img = [[UIImage alloc] initWithData:imgData];
imgView = [[UIImageView alloc] initWithFrame:CGRectMake(x, y + (133-img.size.height)/2, 100, img.size.height)];
imgView.image = img;
[imgView setAlpha:0.0];
[[self.scrollView viewWithTag:1500000*[[tmp objectForKey:@"id"] intValue]] setAlpha:1.0];
[self.scrollView addSubview:imgView];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:2.0];
[[self.scrollView viewWithTag:1500000*[[tmp objectForKey:@"id"] intValue]] setAlpha:0.0];
[imgView setAlpha:1.0];
[UIView commitAnimations];
[[self.scrollView viewWithTag:1500000*[[tmp objectForKey:@"id"] intValue]] removeFromSuperview];
[imgView release];
[img release];
[imgData release];
x+=105;
if (x > 300) {
x=5;
y+=138;
}
}
}
[pool release];
[appDelegate.loadingView setHidden:YES];
}
好了,工作:) 謝謝! – origon 2010-12-21 13:30:27