iOS 文件下载和打开

最近的项目要用到一个在线报告的下载，于是完成后自己在理一下思路，大体的实现了我要得需求。

话不多说，直接上代码

首先，取到网络文件的链接，进行判段是否需求再次下载还是直接打开

#pragma mark   下载报告

////     第一步

//是否下载还是打开文件

- (void)downloadPDF:(NSString *)downloadUrl{

NSArray *array = [downloadUrl componentsSeparatedByString:@"/"]; //从字符/中分隔成多个元素的数组

NSString *file = [array lastObject];

if ([self isFileExist:file]) {

//获取Documents 下的文件路径

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *path = [paths objectAtIndex:0];

NSString *pathString = [path stringByAppendingFormat:@"/%@",file];

NSLog(@"path:%@", pathString);

[self loadDocument:pathString];

}else{

//从新下载

[self downloadFile:downloadUrl];

}

}

#pragma mark      第二步    判断沙盒中是否存在此文件

-(BOOL) isFileExist:(NSString *)fileName

{

//获取Documents 下的文件路径

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *path = [paths objectAtIndex:0];

NSString *filePath = [path stringByAppendingPathComponent:fileName];

NSFileManager *fileManager = [NSFileManager defaultManager];

BOOL result = [fileManager fileExistsAtPath:filePath];

NSLog(@"这个文件已经存在：%@",result?@"是的":@"不存在");

return result;

}

//////////    第三步

//下载PDF

- (void)downloadFile:(NSString *)downLoadUrl{

__weak typeof(self)weakSelf = self;

[self hudTipWillShow:YES];

[DataService downloadTaskWithURL:downLoadUrl completion:^(id result) {

NSLog(@"%@",result);

NSProgress *downloadProgress = result;

if (weakSelf.HUD) {

weakSelf.HUD.progress = downloadProgress.fractionCompleted;

_HUD.labelText = [NSString stringWithFormat:@"%2.f%%",downloadProgress.fractionCompleted*100];

}

} filesPath:^(id filesPath) {

[_rePortDwn setBackgroundImage:[UIImage imageNamed:@"downLoad"] forState:UIControlStateNormal];

//        NSLog(@"%@",filesPath);

NSURL*urlString = filesPath;

NSString *string = [urlString absoluteString];

NSArray *array = [string componentsSeparatedByString:@"/"]; //从字符A中分隔成2个元素的数组

NSString *file = [array lastObject];

NSLog(@"filePathName = :%@",file);

[weakSelf hudTipWillShow:NO];

}];

}

///////       第四步

//已经下载了的文件用webview显示

-(void)loadDocument:(NSString *)documentName

{

UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 64, kSCREEN_WIDTH, kSCREEN_HEIGHT)];

[self.view addSubview:webView];

NSURL *url = [NSURL fileURLWithPath:documentName];

NSURLRequest *request = [NSURLRequest requestWithURL:url];

[webView loadRequest:request];

}

最后，直接调用第一步的方法就可以了。

这其中没有做断点续传，日后有遇到再更新！