0. Import Framework Preparation Work • 1. Drag and drop the afnetworking3.0+ framework program into the project ·2. or use Cocopod to import afnetworking3.0+ 3. Introduction of #import "AFNetworking.h"
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1.UI Prep Work
A. Defining a global nsurlsessiondownloadtask: Download management handle
It is responsible for all network operation requests.
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@interfaceViewController (){ // 下载句柄 NSURLSessionDownloadTask *_downloadTask;} |
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.h文件#import <UIKit/UIKit.h>@interfaceViewController : UIViewController// 下载文件显示@property (weak, nonatomic) IBOutlet UIImageView *imageView;// 下载进度条显示@property (weak, nonatomic) IBOutlet UIProgressView *progressView;@end.m文件@interfaceViewController (){ // 下载句柄 NSURLSessionDownloadTask *_downloadTask;} |
2. Implement file download operation details with AFN
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- (void)downFileFromServer{ //远程地址 NSURL *URL = [NSURL URLWithString:@"http://www.baidu.com/img/bdlogo.png"]; //默认配置 NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; //AFN3.0+基于封住URLSession的句柄 AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration]; //请求 NSURLRequest *request = [NSURLRequest requestWithURL:URL]; //下载Task操作 _downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) { // @property int64_t totalUnitCount; 需要下载文件的总大小 // @property int64_t completedUnitCount; 当前已经下载的大小 // 给Progress添加监听 KVO NSLog(@"%f",1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount); // 回到主队列刷新UI dispatch_async(dispatch_get_main_queue(), ^{ // 设置进度条的百分比 self.progressView.progress = 1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount; }); } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) { //- block的返回值, 要求返回一个URL, 返回的这个URL就是文件的位置的路径 NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; NSString *path = [cachesPath stringByAppendingPathComponent:response.suggestedFilename]; return[NSURL fileURLWithPath:path]; } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) { //设置下载完成操作 // filePath就是你下载文件的位置，你可以解压，也可以直接拿来使用 NSString *imgFilePath = [filePath path];// 将NSURL转成NSString UIImage *img = [UIImage imageWithContentsOfFile:imgFilePath]; self.imageView.image = img; }];} |
3. With regard to the suspension and continuation
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- (IBAction)stopDownloadBtnClick:(id)sender { //暂停下载 [_downloadTask suspend];}- (IBAction)startDownloadBtnClick:(id)sender { //开始下载 [_downloadTask resume];} |
4. Detect network status-optimize user experience
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- (void)viewDidLoad { [super viewDidLoad]; //网络监控句柄 AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager]; //要监控网络连接状态，必须要先调用单例的startMonitoring方法 [manager startMonitoring]; [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) { //status: //AFNetworkReachabilityStatusUnknown = -1, 未知 //AFNetworkReachabilityStatusNotReachable = 0, 未连接 //AFNetworkReachabilityStatusReachableViaWWAN = 1, 3G //AFNetworkReachabilityStatusReachableViaWiFi = 2, 无线连接 NSLog(@"%d", status); }]; //准备从远程下载文件. -> 请点击下面开始按钮启动下载任务 [self downFileFromServer];} |
>> My GitHub: Source https://github.com/saupclear/afnetworking3.0-
· AFNetworking3.0 The following version of the use of the method can see my old version of the log:
ios-using Afnetworking (AFN)-Implement file breakpoint download
Clear Saup
Source: http://www.cnblogs.com/qingche/
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ios-using afnetworking3.0+ (latest AFN)-Implement file breakpoint download
