【代碼筆記】iOS-HTTPQueue下載圖片，

【代碼筆記】iOS-HTTPQueue下載圖片，

一，工程圖。

二，代碼。

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下載圖片#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}//點擊任何處，進行圖片下載-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    if (!_networkQueue) {        _networkQueue = [[ASINetworkQueue alloc] init];    }        // 停止以前的隊列    [_networkQueue cancelAllOperations];        // 建立ASI隊列    [_networkQueue setDelegate:self];    [_networkQueue setRequestDidFinishSelector:@selector(requestFinished:)];    [_networkQueue setRequestDidFailSelector:@selector(requestFailed:)];    [_networkQueue setQueueDidFinishSelector:@selector(queueFinished:)];        for (int i=1; i<3; i++) {        NSString *strURL = [[NSString alloc] initWithFormat:@"http://iosbook3.com/service/download.php?email=%@&FileName=test%i.jpg",@"<你的iosbook3.com使用者郵箱>",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 = [NSJSONSerialization 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 = [[UIAlertView alloc] initWithTitle:@"錯誤資訊"                                                            message:errorStr                                                           delegate:nil                                                  cancelButtonTitle:@"OK"                                                  otherButtonTitles: nil];        [alertView show];    }    if ([_networkQueue requestsCount] == 0) {        [self setNetworkQueue:nil];    }    NSLog(@"請求成功");}- (void)requestFailed:(ASIHTTPRequest *)request{    NSError *error = [request error];    NSLog(@"%@",[error localizedDescription]);    if ([_networkQueue requestsCount] == 0) {        [self setNetworkQueue:nil];    }    NSLog(@"請求失敗");}- (void)queueFinished:(ASIHTTPRequest *)request{    if ([_networkQueue requestsCount] == 0) {        [self setNetworkQueue:nil];    }    NSLog(@"隊列完成");}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end