[Code Note] iOS-HTTPQueue downloads images,

[Code Note] iOS-HTTPQueue downloads images,

1. Engineering Drawing.

Ii. Code.

ViewController. h

#import <UIKit/UIKit.h>#import "ASIHTTPRequest.h"#import "ASINetworkQueue.h"#import "NSNumber+Message.h"#import "NSString+URLEncoding.h"@interface ViewController : UIViewController@property (nonatomic,strong) ASINetworkQueue  *networkQueue;@end

 

ViewController. m

// ASINetworkQueue download image # import "ViewController. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib .} // click anywhere to download the image-(void) touchesBegan :( NSSet *) touches withEvent :( UIEvent *) event {if (! _ NetworkQueue) {_ networkQueue = [[ASINetworkQueue alloc] init];} // stop a previous queue [_ networkQueue cancelAllOperations]; // create an ASI queue [_ networkQueue setDelegate: self]; [_ networkQueue setRequestDidFinishSelector: @ selector (requestFinished :)]; [_ networkQueue failed: @ selector (requestFailed :)]; [_ networkQueue failed: @ selector (queueFinished :)]; for (int I = 1; I <3; I ++) {NSSt Ring * strURL = [[NSString alloc] initWithFormat: @ "http://iosbook3.com/service/download.php? Response ", @" <your iosbook3.com user email> ", I]; NSURL * url = [NSURL URLWithString: [strURL URLEncodedString]; ASIHTTPRequest * request = [ASIHTTPRequest requestWithURL: url]; request. tag = I; [_ networkQueue addOperation: request];} [_ networkQueue go];}-(void) requestFinished :( ASIHTTPRequest *) request {NSData * data = [request responseData]; NSError * eror; NSDictionary * resDict = [NSJSONSeria Lization JSONObjectWithData: data options: NSJSONReadingAllowFragments error: & eror]; if (! ResDict) {UIImage * img = [UIImage imageWithData: data]; if (request. tag = 1) {// _ imageView1.image = img; NSLog (@ "--- img -- % @", img);} else {// _ imageView2.image = img; NSLog (@ "--- img -- % @", img) ;}} else {NSNumber * resultCodeObj = [resDict objectForKey: @ "ResultCode"]; NSString * errorStr = [resultCodeObj errorMessage]; UIAlertView * alertView = [[delealloc] initWithTitle: @ "error message" message: errorStr delegate: nil cancelButtonTitle: @ "OK" response: nil]; [alertView show];} if ([_ networkQueue requestsCount] = 0) {[self setNetworkQueue: nil];} NSLog (@ "request succeeded ");} -(void) requestFailed :( ASIHTTPRequest *) request {NSError * error = [request error]; NSLog (@ "% @", [error localizedDescription]); if ([_ networkQueue requestsCount] = 0) {[self setNetworkQueue: nil];} NSLog (@ "request failed");}-(void) queueFinished :( ASIHTTPRequest *) request {if ([_ networkQueue requestsCount] = 0) {[self setNetworkQueue: nil];} NSLog (@ "queue completed");}-(void) didReceiveMemoryWarning {[super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated .} @ end