基于AFNetworking封装的下载管理类

作者: 慕言的世界 | 来源:发表于2016-11-07 16:38 被阅读1430次

基于AFNetworking封装的下载管理类
基于AFNetworking3.0封装的网络请求
AFNetworking 原理和SDWebImage原理
Swift3-基于AFNetworking下的Swift3网络请
KZWFoudation系列之网络层封装
ios网络下载类的简单封装---基于最新的AFNetWorkin
iOS网络层封装（基于AFNetworking3.0）
YTKNetwork集成教程以及相关问题思考
改造YTKNetWork(迁移到AF3.0)
基于AFNetworking（3.2.1）和ReactiveOb

从自己刚开始做项目时，一直都是用AFNetworking进行网络请求。每次涉及网络请求的时候都手写一次，写的整个人都不好不好了。特别AFNetworking升级3.0的时候真想剁了自己的手。从那以后只要是第三方的我基本都是自己做一层封装。废话不多说下面来聊聊下载类的封装。

所谓下载管理类：无非就是，在对AFNetworking封装便用的时候，在进行一次对下载工具的封装。这样的好处有以下几点：

同一个网址的数据请求只会进行一次。例如用户对TableView的疯狂下拉刷新数据源处理不好可能会崩溃。
控制器消失的时候取消当前数据请求。 AFNetworking进行数据请求，如果不手动取消请求的话在控制器销毁的时候此次任务还是存在的。~~当请求完成的时候走回调Block这就有崩溃的危险存在。~~当初这里理解了，当AF请求没有完成就pop的话，由于AF引用当前界面，所以当前界面不会释放。直至完成才会释放故不存在crash一说。返回只是节省用户流量罢了。
QQsession.h中的方法

@interface QQsession : NSObject
@property (copy, nonatomic) NSString *urlStr;
- (NSURLSessionDataTask *)conenctWithstr:(NSString *)urlStr dic:(NSDictionary *)dic fromController:(UIViewController *)controller success:(void(^)(id resposeObject))success  andfalse:(void(^)(NSError *error))falseBlock;
- (NSURLSessionDataTask *)postWithstr:(NSString *)urlStr dic:(NSDictionary *)dic fromController:(UIViewController *)controller success:(void(^)(id resposeObject))success  andfalse:(void(^)(NSError *error))falseBlock;
//
- (void)cancelWithOperation:(NSURLSessionDataTask *)operation;
@end

QQsession.m中的方法

@interface QQsession ()
@end

@implementation QQsession

- (NSURLSessionDataTask *)conenctWithstr:(NSString *)urlStr dic:(NSDictionary *)dic fromController:(UIViewController *)controller success:(void(^)(id resposeObject))success  andfalse:(void(^)(NSError *error))falseBlock
{
   //没网络的情况时直接返回

    if (![self requestBeforeJudgeConnect]) {
        [[NSNotificationCenter defaultCenter] postNotificationName:@"QQtableview" object:nil];
        [[QQNetManager defaultManager] showProgressHUDWithType:0];
        return nil;
    }
    NSMutableDictionary *tokenDic = [NSMutableDictionary dictionaryWithDictionary:dic];
    [tokenDic setValue:[[NSUserDefaults standardUserDefaults] objectForKey:@"token"] forKey:@"token"];
    
    [[QQNetManager defaultManager] insertQQConnection:self];
    [controller.view Loading_0314];
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.requestSerializer.timeoutInterval = 30.f;
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", nil];
    NSString *encoded = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURLSessionDataTask * operation = [manager GET:encoded parameters:tokenDic progress:^(NSProgress * _Nonnull downloadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        
        [self handleResponseObject:responseObject Controller:controller Success:success];
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        [self handleResponseObject:error Controller:controller failure:falseBlock];
    }];
    [[QQNetManager defaultManager] insertConnectionVC:controller QQConnection:self SessionDataTask:operation];

    return operation;
}
- (NSURLSessionDataTask *)postWithstr:(NSString *)urlStr dic:(NSDictionary *)dic fromController:(UIViewController *)controller success:(void(^)(id resposeObject))success  andfalse:(void(^)(NSError *error))falseBlock
{
    //没网络的情况时直接返回
    if (![self requestBeforeJudgeConnect]) {
        [[NSNotificationCenter defaultCenter] postNotificationName:@"QQtableview" object:nil];
        [[QQNetManager defaultManager] showProgressHUDWithType:0];
        return nil;
    }
    NSMutableDictionary *tokenDic = [NSMutableDictionary dictionaryWithDictionary:dic];
    [tokenDic setValue:[[NSUserDefaults standardUserDefaults] objectForKey:@"token"] forKey:@"token"];
    
    [[QQNetManager defaultManager] insertQQConnection:self];
    [controller.view Loading_0314];
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.requestSerializer.timeoutInterval = 30.f;
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", nil];
    NSString *encoded = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    
   NSURLSessionDataTask * operation = [manager POST:encoded parameters:tokenDic progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        [self handleResponseObject:responseObject Controller:controller Success:success];
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        [self handleResponseObject:error Controller:controller failure:falseBlock];
    }];
    [[QQNetManager defaultManager] insertConnectionVC:controller QQConnection:self SessionDataTask:operation];

    return operation;
}
#pragma mark - 统一处理下载返回的数据
- (void)handleResponseObject:(id)responseObject  Controller:(UIViewController *)controller Success:(void(^)( id  _Nullable responseObject))successBlock;
{
 

            [[NSNotificationCenter defaultCenter] postNotificationName:@"QQtableview" object:nil];
        }
  
            successBlock(responseObject);

    [UIApplication sharedApplication].networkActivityIndicatorVisible =NO;
    [[QQNetManager defaultManager] deleteQQConnection:self];
}
- (void)handleResponseObject:(NSError *)error  Controller:(UIViewController *)controller failure:(void(^)(NSError *error))failureBlock
{
    failureBlock(error);
    [controller.view Hidden];
#warning 主动退出怎么才能不显示失败的提示 -999就是取消此次下载
    if (error.code != -999) {
        //非主动取消链接
        [[QQNetManager defaultManager] showProgressHUDWithType:0];
    }
    [UIApplication sharedApplication].networkActivityIndicatorVisible =NO;
    [[QQNetManager defaultManager] deleteQQConnection:self];
}
#pragma mark - 取消下载
- (void)cancelWithOperation:(NSURLSessionDataTask *)operation
{
    [operation cancel];
    [[QQNetManager defaultManager] deleteQQConnection:self];
}
#pragma mark  网络判断
-(BOOL)requestBeforeJudgeConnect
{
    struct sockaddr zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sa_len = sizeof(zeroAddress);
    zeroAddress.sa_family = AF_INET;
    SCNetworkReachabilityRef defaultRouteReachability =
    SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
    BOOL didRetrieveFlags =
    SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
    if (!didRetrieveFlags) {
        QMLog(@"Error. Count not recover network reachability flags\n");
        return NO;
    }
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    BOOL isNetworkEnable  =(isReachable && !needsConnection) ? YES : NO;
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIApplication sharedApplication].networkActivityIndicatorVisible =isNetworkEnable;/*  网络指示器的状态： 有网络 ： 开  没有网络： 关  */
    });
    return isNetworkEnable;
}

QQNetManager.h中的方法

@interface QQNetManager : NSObject
{
    NSMutableDictionary *_dataDic;///<纪录下载的url
    NSMutableArray      *_VCS; ///<纪录当前控制器有哪些下载
    UIAlertView         * _alert;///<防治alert重复出现
}
+ (id)defaultManager;

- (NSURLSessionDataTask *)startGetHttpWithStr:(NSString *)url Dictionary:(NSDictionary *)parameters  fromController:(UIViewController *)controller Success:(void(^)( id responseObject))Success andFalse:(void(^)(NSError *error))falseBlock;
- (NSURLSessionDataTask *)startPostHttpWithStr:(NSString *)url  Dictionary:(NSDictionary *)parameters  fromController:(UIViewController *)controller Success:(void(^)( id responseObject))Success andFalse:(void(^)(NSError *error))falseBlock;
- (void)insertQQConnection:(QQsession *)hc;///<插入对象
- (void)deleteQQConnection:(QQsession *)hc;//<删除对象
//- (void)stopAllConnection;
- (void)showProgressHUDWithType:(NSInteger)type;//<显示提示
//控制器用
- (void)insertConnectionVC:(UIViewController *)VC  QQConnection:(QQsession *)hc  SessionDataTask:(NSURLSessionDataTask *)task;//<插入但前控制器的

- (void)deleteConnectionVC:(UIViewController *)vc;//<销毁控制器诗取消下载```
`QQNetManager.m`中的方法

@implementation QQNetManager
{
NSURLSessionDataTask * operation;
NSLock *lock;
}

(id)init
{
if (self = [super init]) {
_dataDic = [[NSMutableDictionary alloc]init];
_VCS = [NSMutableArray array];
}
return self;
}

(id)defaultManager{
static QQNetManager manager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manager = [[self alloc]init];
[manager startMonitorConnection];
});
return manager;
}
/*

带控制器的get请求
@param url url
@param parameters parameter
@param controller contortion
@param Success
@param falseBlock
*/

(NSURLSessionDataTask *)startGetHttpWithStr:(NSString *)url Dictionary:(NSDictionary *)parameters fromController:(UIViewController *)controller Success:(void(^)( id responseObject))Success andFalse:(void(^)(NSError error))falseBlock
{
/ 传入url开始下载前在数组来查找有没有此Url对应的键值
有表示此下载存在返回
无表示无此下载开始下载/
QQsession *QS= [_dataDic objectForKey:url];
if (!QS) {
QS = [[QQsession alloc]init];
QS.urlStr = url;
operation = [QS conenctWithstr:url dic:parameters fromController:controller success:^(id resposeObject) {
Success(resposeObject);
```
      } andfalse:^(NSError *error) {
          falseBlock(error);
      }];
  }
```
return operation;
}
/**

带控制器的post请求
@param url url description
@param parameters parameters description
@param controller controller description
@param Success Success description
@param falseBlock falseBlock description
*/

(NSURLSessionDataTask *)startPostHttpWithStr:(NSString *)url Dictionary:(NSDictionary *)parameters fromController:(UIViewController *)controller Success:(void(^)( id responseObject))Success andFalse:(void(^)(NSError *error))falseBlock
{
QQsession *QS= [_dataDic objectForKey:url];
if (!QS) {
QS = [[QQsession alloc]init];
QS.urlStr = url;
operation = [QS postWithstr:url dic:parameters fromController:controller success:^(id resposeObject) {
Success(resposeObject);
} andfalse:^(NSError *error) {
falseBlock(error);
}];
}
return operation;
}
//为了防止单个网络请求多次请求例如刷新
(void)insertQQConnection:(QQsession *)hc
{
[_dataDic setObject:hc forKey:hc.urlStr];
}
(void)deleteQQConnection:(QQsession )hc
{
[_dataDic removeObjectForKey:hc.urlStr];
}
/*
某个线程A调用lock方法。这样，NSLock将被上锁。可以执行“关键部分”，完成后，调用unlock方法。

如果，在线程A 调用unlock方法之前，另一个线程B调用了同一锁对象的lock方法。那么，线程B只有等待。直到线程A调用了unlock
*/

(void)insertConnectionVC:(UIViewController *)VC QQConnection:(QQsession *)hc SessionDataTask:(NSURLSessionDataTask *)task
{
[lock lock];
NSDictionary *Dic = @{String(VC):hc,@"Task":task};
[_VCS addObject:Dic];
[lock unlock];
}
//控制器消失的时候取消下载
(void)deleteConnectionVC:(UIViewController *)vc
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[lock lock];
NSMutableArray tempArr = [NSMutableArray arrayWithArray:_VCS];
NSMutableArray VCArray = [NSMutableArray arrayWithArray:vc.childViewControllers];
if ([TXUtilsString IsNull:vc]) {
[VCArray addObject:[UIViewController new]];
}else{
[VCArray addObject:vc];
}
/
有的三方滑动视图或者自己的写的segment都会用到addchildviewcontroller：
但是点击返回直接返回到上一个界面 segment的父视图是自己写的另一个界面而三方的滑动视图是别人的
*/

warning 这里主要还是根据入库的控制器来写不是一定的根据个人需要

// //针对滑动的三方
for (UIViewController *VC in VCArray) {
for (NSDictionary *TempDic in tempArr) {
if (TempDic[String(VC)]) {
[self deleteQQConnection:TempDic[String(VC)]];
[(QQsession *)TempDic[String(VC)] cancelWithOperation:TempDic[@"Task"]];
if (_IsConsolePrint) {
QMLog(@"Cancel this url '%@'",[(QQsession *)TempDic[String(VC)] urlStr]);
}
[_VCS removeObject:TempDic];
}
}
}
[lock unlock];
});
}

(void)showProgressHUDWithType:(NSInteger)type {
//解决alert重弹出
if (_alert.isVisible) {
return;
}
NSString *msg = nil;
switch (type) {
case 0:
{
msg =@"网络连接异常，请检查网络！";
break;
}
case 1:
{
msg = @"服务故障，正在抢修！";
break;
}
default:
break;
}
_alert = [[UIAlertView alloc]initWithTitle:@"" message:msg delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil] ;
[_alert show];
}
@end

下面是自定义Navgationcontroller配合下载类做控制器销毁取消下载
`QQNavigationController.m`文件中的方法

@interface QQNavigationController ()<UIGestureRecognizerDelegate,UINavigationControllerDelegate>
{
UIViewController *tempVC;///栈顶的控制器
}
@end

@implementation QQNavigationController

(void)initialize{

}

(void)viewDidLoad {
[super viewDidLoad];
//添加系统自带的手势返回
self.delegate = self;
if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.interactivePopGestureRecognizer.delegate = self;
}

self.view.backgroundColor = [UIColor whiteColor];
//设置透明度相差64像素
self.navigationBar.translucent = YES;
//设置颜色
self.navigationBar.barTintColor = RGB(0, 122, 255);
//处理ScrollViewInsets的自动下沉
self.automaticallyAdjustsScrollViewInsets = NO;

[self.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName, [UIFont systemFontOfSize:20], NSFontAttributeName, nil]];

if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=7.0)){
//如应用中出现seachbar的跳动，视图位置出现问题，有可能是这里引起的
self.edgesForExtendedLayout = UIRectEdgeNone;//视图控制器，四条边不指定
```
  self.extendedLayoutIncludesOpaqueBars = NO;//不透明的操作栏
  //设置view的位置
  self.modalPresentationCapturesStatusBarAppearance = NO;
```

// [[UINavigationBar appearance] setBackgroundImage:[UIImage new]
// forBarPosition:UIBarPositionTop
// barMetrics:UIBarMetricsDefault];
//设置navi透明需要translucent = yes,设置图片，barMetrics（更改类型的道不同的效果）
}else{
// [self.navigationBar setBackgroundImage:[UIImage new]
// forBarMetrics:UIBarMetricsDefault];
}
//nav下面的横线消失
// self.navigationBar.shadowImage = [UIImage new];

}
//配合修改状态栏颜色

(UIViewController *)childViewControllerForStatusBarStyle{
return self.topViewController;
}
(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
//防止在push的过程中触发返回的时间导致崩溃
if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.interactivePopGestureRecognizer.enabled = NO;
}
if (self.childViewControllers.count > 0) {
viewController.hidesBottomBarWhenPushed = YES;
UIButton *button = [[UIButton alloc] init];
[button setImage:[UIImage imageNamed:@"arrow_left"] forState:UIControlStateNormal];
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
button.bounds = CGRectMake(0, 0, 70, 30);
button.contentEdgeInsets = UIEdgeInsetsMake(0, -5, 0, 0);
button.titleLabel.font = [UIFont systemFontOfSize:15];
viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
}
[super pushViewController:viewController animated:animated];
}
(void)back
{
/UIViewController * VC = [self popViewControllerAnimated:YES];
//这里打印的是刚刚出栈的VC
QMLog(@"%@",VC);
[[QQNetManager defaultManager] deleteConnectionVC:VC];/

[[QQNetManager defaultManager] deleteConnectionVC:self.viewControllers.lastObject];
QMLog(@"viewControllers-pop：%@",self.viewControllers.lastObject);
}

warning 这里可以设置返回手势的开关

//推送的视图将要出现时将侧滑返回设置为真

(void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animated
{
if (navigationController.viewControllers.count == 1){
navigationController.interactivePopGestureRecognizer.enabled = NO;
}else{
navigationController.interactivePopGestureRecognizer.enabled = YES;
}
//获取栈顶的Vc
tempVC = navigationController.viewControllers.lastObject;
}
(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
id<UIViewControllerTransitionCoordinator> tc = navigationController.topViewController.transitionCoordinator;
[tc notifyWhenInteractionEndsUsingBlock:^(id<UIViewControllerTransitionCoordinatorContext> context) {
//手势返回成功取消
if (![context isCancelled]) {
QMLog(@"%@",viewController);//这里打印的是栈顶的VC 所以要tempVC中间过渡
[[QQNetManager defaultManager] deleteConnectionVC:tempVC];
}
}];
}
// 为了解决与scroll的手势冲突
(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]
&& [otherGestureRecognizer isKindOfClass:[UIScreenEdgePanGestureRecognizer class]]){
// [_scrollView.panGestureRecognizer requireGestureRecognizerToFail:screenEdgePanGestureRecognizer];
return NO;
}else{
return YES;
}
}

文件中的注释已经很详细了，在这里就不多做赘述了。
有个要注意的是`AFNetworking` 手动取消下载也会执行下载失败的回调，打印`error`为
```Error Domain=NSURLErrorDomain Code=-999 "已取消" UserInfo={NSErrorFailingURLKey=http://172.16.10.34:8080/wisdomCampus_interface/assessment/queryList?flag=1&pageindex=1&pagesize=10&token=932b80a56a38bcc1b22796c2fdf57383, NSLocalizedDescription=已取消, NSErrorFailingURLStringKey=http://172.16.10.34:8080/wisdomCampus_interface/assessment/queryList?flag=1&pageindex=1&pagesize=10&token=932b80a56a38bcc1b22796c2fdf57383}```
可以利用`error ==-999`来判断是不是取消下载执行的失败回调。

##2016.11.14日更新内容
之前的
```UIViewController * VC =   [self popViewControllerAnimated:YES];
//这里打印的是刚刚出栈的VC 
    QMLog(@"%@",VC);
    [[QQNetManager defaultManager] deleteConnectionVC:VC]```
会有一个问题  就是当我A界面push进B界面，然后迅速（就是很快很快）pop回B界面，虽然返回成功但是`popViewControllerAnimated:YES` 的返回值是`nil`之前在`- (void)deleteConnectionVC:(UIViewController *)vc
`里面没有做空的判断因此会崩溃。不过此时`viewControllers`里面是有B界面的。所以现在用`    [[QQNetManager defaultManager] deleteConnectionVC:self.viewControllers.lastObject];
`来取值
##2017.03.18日更新内容
`popViewControllerAnimated:YES `返回为nil，大概是因为pop动画没有完成的造成的。与之相关联的章[我是传送门点我进入](http://blog.lessfun.com/blog/2015/09/09/uiviewcontroller-push-pop-trap/)
[附上下载地址](http://code.cocoachina.com/view/134516)demo里面有增加一些东西文章中没有写出来
[自己日常用到的一些组件](https://github.com/MuYanQin/QQKit)

#如有错误请提出我会改正，勿喷！持续更新。。

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网友评论

沙漠绿洲1111:楼主，麻烦发下demo啊！！邮箱daqiangwang1989@163.com
沙漠绿洲1111:@慕言的世界好的，多谢
慕言的世界:@沙漠绿洲1111 https://github.com/MuYanQin/QQFoundation 去下载就好了
3989ba68ec00:博主，求发：463510540@qq.com
慕言的世界:@久久北北里面的链接打不开了吗
c2ba9f08e2c3:Demo的链接地址，下载总是失败
c2ba9f08e2c3:@慕言的世界哦哦，看到了
c2ba9f08e2c3:@慕言的世界你demo里面“即将废弃的方法分割线”指哪些方法？
慕言的世界:@CoyoteKP 俩个链接都是嘛
在这蓝色天空下:楼主，能发下demo吗？ 85643603@qq.com 谢谢
小志Shannon:博主你好，请问有完整的Demo，里面有些你自己定义的宏定义，还有一些地方没有理解，邮箱541273160@qq.com 谢谢
慕言的世界:@潇岩刚看到已发
潇岩:博主，请你也发我一份，谢谢884655589@qq.com
慕言的世界:@小志Shannon 好等俩天我在完善一点再给你
晨光的暖日:沙发学习了感谢楼主

基于AFNetworking封装的下载管理类

warning 这里主要还是根据入库的控制器来写不是一定的根据个人需要

warning 这里可以设置返回手势的开关

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