iOS GCD下载图片

cell.myimage.layer.masksToBounds=YES;

cell.myimage.layer.cornerRadius=cell.myimage.frame.size.width/2;

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

NSURL *url=[NSURL URLWithString:cellInfo.image];

NSData *data=[[NSData alloc]initWithContentsOfURL:url];

UIImage *iamge=[[UIImage alloc]initWithData:data];

if (data!=nil) {

dispatch_async(dispatch_get_main_queue(), ^{

[cell.myimage setBackgroundImage:iamge forState:UIControlStateNormal];

});

}

});