检查iphone中进程间的Internet连接

I have the following code

我有以下代码

NSURL *url = [NSURL URLWithString:@"https://wallpaperswide.com/download/flattened_grass-wallpaper-2800x1050.jpg"];  //Line1
NSData *data = [[NSData alloc] initWithContentsOfURL:url];  //Line2
UIImage *tmpImage = [[UIImage alloc] initWithData:data];  //Line3
NSLog(@"%@",tmpImage);  //Line4
NSURL *url