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
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];
}
}
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！ 欢迎提出和指正
