从iOS中的URL加载UIImage [英] Load UIImage from URL in iOS

问题描述

我正在尝试使用completion和placeholder图像从其URL加载UIImage，但是UIImage和占位符UIImage均未加载.

I am trying to load a UIImage from its URL with completionand placeholder image , but neither the UIImage nor the placeholder UIImage are loaded.

这是我的代码:

  NSURL *url = [NSURL URLWithString:@"http://assets.gearlive.com/tvenvy/blogimages/stewiegriffin.jpg"];
  NSURLRequest *request = [NSURLRequest requestWithURL:url];

  [self.imageView setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"bg.png"]

      success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
          imageView.image = image;
      } 
      failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {}
   ];

推荐答案

使用AFnetworking，如果url不正确，您还可以在其中设置占位符图像.在表格视图或集合视图中加载图像时，这种方法会更有效.

Use AFnetworking where you can set placeholder image also if the url is not correct. This is more efficient when you are loading images in a tableview or a collection view.

导入UIImageView+AFNetworking.h

#import "UIImageView+AFNetworking.h"

和我们下面的代码:

NSString *url1=@"http://www.fnordware.com/superpng/pnggrad16rgb.png";
[self.image setImageWithURL:[NSURL URLWithString:url1] placeholderImage:[UIImage imageNamed:@"placeholder.png"]]; 

您可以从 gitHub

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