提前注释:下载方法出处在哪,我就不得而知了,不得而知了
我是复制项目里的代码,陈年往事不在查出处了,
看到的伙伴如果看到了原文,请联系我,我及时注明,🙏
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文章里的代码块,可直接复制到程序里使用
增加如下代理:
NSURLSessionDownloadDelegate,UIWebViewDelegate,UIDocumentInteractionControllerDelegate
/**
* 下载任务
*/
@property (nonatomic, strong) NSURLSessionDownloadTask* downloadTask;
/**
* resumeData记录下载位置
*/
@property (nonatomic, strong) NSData* resumeData;
/**
* session
*/
@property (nonatomic, strong) NSURLSession* session;
源生session网络请求,点击方法里写👇这段代码,开始下载文件
//分解下载,大文件时使用
NSURL* url = [NSURL URLWithString:noteModel.contractFileUrl];
// 创建任务
self.downloadTask = [self.session downloadTaskWithURL:url];
// 开始任务
[self.downloadTask resume];
session的懒加载
- (NSURLSession *)session
{
if (nil == _session) {
NSURLSessionConfiguration *cfg = [NSURLSessionConfiguration defaultSessionConfiguration];
self.session = [NSURLSession sessionWithConfiguration:cfg delegate:self delegateQueue:[NSOperationQueue mainQueue]];
}
return _session;
}
下载完毕会调用NSURLSessionDownloadDelegate
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location
{
NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
// response.suggestedFilename ： 建议使用的文件名，一般跟服务器端的文件名一致
NSString *file = [caches stringByAppendingPathComponent:downloadTask.response.suggestedFilename];
// 将临时文件剪切或者复制Caches文件夹
NSFileManager *mgr = [NSFileManager defaultManager];
// AtPath : 剪切前的文件路径
// ToPath : 剪切后的文件路径
//location 文件临时地址
[mgr moveItemAtPath:location.path toPath:file error:nil];
[Utils hideLoding:self.view];
/*
// 提示下载完成
[[[UIAlertView alloc] initWithTitle:@"下载完成" message:downloadTask.response.suggestedFilename delegate:self cancelButtonTitle:@"知道了" otherButtonTitles: nil] show];
*/
//文件路径
NSString *cachePath = file;
/*
/var/mobile/Containers/Data/Application/--/Library/Caches/888.docx
下面这段代码是调起预览
*/
UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:cachePath]];
documentController.delegate = self;
//直接显示预览
[documentController presentPreviewAnimated:YES];
//显示包含预览的菜单项
//[documentController presentOptionsMenuFromRect:CGRectZero inView:self.view animated:YES];
//显示不包含预览菜单项
[documentController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
}
在这里面监听下载进度，totalBytesWritten/totalBytesExpectedToWrite
每次写入沙盒完毕调用
bytesWritten 这次写入的大小
totalBytesWritten 已经写入沙盒的大小
totalBytesExpectedToWrite 文件总大小
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{
// NSLog((@"\n[函数名:%s]\n" "[行号:%d]\n" "%f\n"), __FUNCTION__, __LINE__,(double)totalBytesWritten/totalBytesExpectedToWrite);
}
👇调用预览的代理方法
- (UIViewController*)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController*)controller
{
return self;
}
- (UIView*)documentInteractionControllerViewForPreview:(UIDocumentInteractionController*)controller
{
return self.view;
}
- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController*)controller
{
return self.view.frame;
}
点击预览窗口的“Done”(完成)按钮时调用
- (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController*)_controller
{
}
