从Web上加载UIImage的最常见方法 [英] The most common way to load UIImage from the web

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 UIActivityIndi​​cator ，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 UIActivityIndi​​cator 。 
 
 
 
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：
  UIActivityIndi​​cator * activity = [[UIActivityIndi​​cator alloc] initWithStyle：UIActivityIndi​​catorWhite]; 
 [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/AsyncImageView

it 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];
 });
 }); 


                        
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