通过OperationQueue加载UIImageView时出现问题
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我使用NSOperationQueue加载UIImageView。
负载从Internet上获取图像，然后将其添加到图像视图。我的问题是该方法完成了，但是大约需要3秒钟后，图像视图才能实际显示图像或从超级视图中删除图像视图...
- (void)viewDidLoad { NSLog(@\"AirportDetailView: viewDidLoad\");
[super viewDidLoad];
[self.activity startAnimating];
self.queue = [NSOperationQueue new];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(loadImage) object:NULL];
[self.queue addOperation:operation];
[operation release];
}
-(void)loadImage {
[myAp ImageForAp];
NSLog(@\"ImageFor Ap Ended, %@\",myAp.ApDiagram);
[self.activity stopAnimating];
if (myAp.ApDiagram==NULL) {
NSLog(@\"Finally Gets Here\");
[self.Diagram removeFromSuperview];
}
else {
NSLog(@\"Finally Gets Here with Diag\");
[self.Diagram setBackgroundImage:myAp.ApDiagram forState:UIControlStateNormal];
}
}
-(void)loadImage {
[myAp ImageForAp];
NSLog(@\"ImageFor Ap Ended, %@\",myAp.ApDiagram);
[self performSelectorOnMainThread:@selector(UpdateUI) withObject:nil waitUntilDone:NO];
}
-(void)UpdateUI {
[self.activity stopAnimating];
if (myAp.ApDiagram==NULL) {
NSLog(@\"Finally Gets Here\");
[self.Diagram removeFromSuperview];
}
else {
NSLog(@\"Finally Gets Here with Diag\");
[self.Diagram setBackgroundImage:myAp.ApDiagram forState:UIControlStateNormal];
}
}
没有找到相关结果
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1 个回复
芭隘的盘石
方法。所有UI操作都需要在主线程上进行才能正常工作。您的代码将需要看起来与此相似。-(void)loadImage { [myAp ImageForAp]; [self performSelectorOnMainThread:@selector(UpdateUI) withObject:nil waitUntilDone:NO]; } -(void)UpdateUI { [self.activity stopAnimating]; if (myAp.ApDiagram==NULL) { [self.Diagram removeFromSuperview]; } else { [self.Diagram setBackgroundImage:myAp.ApDiagram forState:UIControlStateNormal]; } }应改为