Get asynchronous request Picture step

-(Ibaction) GetImage: (ID) Sender {

1, prepare the URL

NSString *str = @ "http://e.hiphotos.baidu.com/image/h%3D1200%3Bcrop%3D0%2C0%2C1920%2C1200/sign= E13d66699825bc31345d059a6eefb6d2/6159252dd42a2834f85385ac5ab5c9ea14cebfa4.jpg ";

Nsurl *url = [Nsurl urlwithstring:str];

2, create the Request object

Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];

Linked objects, block async

__block Mxtviewcontroller *weakself = self;

Nsoperationqueue *queue = [[Nsoperationqueue new] autorelease];

[Nsurlconnection sendasynchronousrequest:request queue:queue completionhandler:^ (NSURLResponse *response, NSData * Data, Nserror *connectionerror) {

Get Data

UIImage *image = [UIImage imagewithdata:data];

Back to the main thread update page

Dispatch_sync (Dispatch_get_main_queue (), ^{

Block can not access the property using _imageview, it will cause self reference count +1, cannot use strong reference

To use weak

WeakSelf.imageView.image = image;

});

}];

Get asynchronous request picture step