从Web上加载UIImage的最常见方法

本文介绍了从Web上加载UIImage的最常见方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述亲爱的stackoverflowers 我走了。在我的应用程式中， web，像这样： - （void）loadImages { ... image1 = [UIImage imageWithData：[NSData dataWithContentsOfURL：imgUrl1]]; image2 = [UIImage imageWithData：[NSData dataWithContentsOfURL：imgUrl2]]; } 为了不阻塞主线程，我使用 GCD ： dispatch_async（dispatch_get_global_queue（0,0），^ { [self loadImages]; $ b在这之后，我使用这些图像在我的 UITableView if（indexPath.row == 0） { cell.imageView.image = image1 ; } else { cell.imageView.image = image2; } 然后我决定添加 UIActivityIndicator ，但是遇到一些问题，我理解我的代码不正确，使用 NSURLRequest 和 NSURLConnection 加载图像并添加 UIActivityIndicator 。您能告诉我什么是最重要的加载图片的方式？我应该重写什么？解决方案我建议你使用AsyncImageView一个漂亮的实现由Nicklockwood的iCarousel的父亲。 https://github.com/nicklockwood/AsyncImageView 它是非常简单。 #importAsyncImageView.h [imageView setImage：p $ p> @default.png]; [imageView setImageURL：@whateverurl / whateverimage.png]; 在你的情况下，它将是： [cell.imageView setImageURL：@yourURL ]; 它的作用就像一个charm，我的代码正在生产中。但是如果你仍然希望你的代码工作，请尝试这样： UIActivityIndicator * activity = [[UIActivityIndicator alloc] initWithStyle：UIActivityIndicatorWhite]; [activity setFrame：CGRectMake（100,100,30,30]]; [self.view addSubview：activity]; dispatch_queue_t dispatchQueue = dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_HIGH，0）; dispatch_async（dispatchQueue，^（void） { [activity startAnimating]; [self loadImages]; dispatch_sync（dispatch_get_main_queue（），^ { [yourTableView reloadData]; [activity stopAnimating]; [activty setHidden：YES]; }）; }）; Dear stackoverflowers,I have gone astray.In my app I load 2 images from the web, like this:-(void)loadImages{ ... image1 = [UIImage imageWithData:[NSData dataWithContentsOfURL:imgUrl1]]; image2 = [UIImage imageWithData:[NSData dataWithContentsOfURL:imgUrl2]];}In order to not blocking the main thread, I use GCD:dispatch_async( dispatch_get_global_queue(0,0), ^{ [self loadImages];After that, I use these images in my UITableView:if (indexPath.row == 0) { cell.imageView.image = image1; } else { cell.imageView.image = image2; }Then I decided to add UIActivityIndicator, but faced some problems. I understand that my code is not correct. I saw that people using NSURLRequest and NSURLConnection to load images and add UIActivityIndicator.Could you tell me please, what is the most standart way to load images like that ? What should I rewrite ? 解决方案 I would suggest you to use AsyncImageView a beautiful implementation by Nicklockwood -father of iCarousel.https://github.com/nicklockwood/AsyncImageViewit is very simple to use. #import "AsyncImageView.h"and in all imageViews do this. [imageView setImage:@"default.png"]; [imageView setImageURL:@"whateverurl/whateverimage.png"];In your case it would be: [cell.imageView setImageURL:@"yourURL"];It works like a charm, and my code is in production. But if you still want your code to work try this: UIActivityIndicator *activity =[[UIActivityIndicator alloc] initWithStyle:UIActivityIndicatorWhite]; [activity setFrame:CGRectMake(100,100,30,30)]; [self.view addSubview:activity]; dispatch_queue_t dispatchQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0); dispatch_async(dispatchQueue, ^(void) { [activity startAnimating]; [self loadImages]; dispatch_sync(dispatch_get_main_queue(), ^{ [yourTableView reloadData]; [activity stopAnimating]; [activty setHidden:YES]; }); }); 这篇关于从Web上加载UIImage的最常见方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！