ios多線程GCD下載圖片

標籤：

 1 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 2 { 3     dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 4     dispatch_async(queue, ^{ 5         NSLog(@"--download--%@", [NSThread currentThread]); 6         // 下載圖片 7         NSURL *url = [NSURL URLWithString:@"http://news.baidu.com/z/resource/r/image/2014-06-22/2a1009253cf9fc7c97893a4f0fe3a7b1.jpg"]; 8         NSData *data = [NSData dataWithContentsOfURL:url]; // 這行會比較耗時 9         UIImage *image = [UIImage imageWithData:data];10         11         // 回到主線程顯示圖片12         dispatch_async(dispatch_get_main_queue(), ^{13             NSLog(@"--imageView--%@", [NSThread currentThread]);14             self.imageView.image = image;15         });16     });17 }

 

ios多線程GCD下載圖片