将文件写入 NSDocument 目录在 iPhone 中显示 UIProgressView?
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【中文标题】将文件写入 NSDocument 目录在 iPhone 中显示 UIProgressView?【英文标题】:Write file to NSDocument directory show UIProgressView in iPhone? 【发布时间】:2013-03-28 06:12:16 【问题描述】:我有一个来自服务器的pdf 文件。
然后我需要将文件加载到 NSDocument 目录路径并且它工作正常,但我想显示 UIProgressView 以存储每个字节。如何做到这一点,请帮助我
提前致谢
我尝试这样存储:
NSError *error;
NSArray *ipaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *idocumentsDir = [ipaths objectAtIndex:0];
NSString *idataPath = [idocumentsDir stringByAppendingPathComponent:@"File"];
NSLog(@"idataPath:%@",idataPath);
//Create folder here
if (![[NSFileManager defaultManager] fileExistsAtPath:idataPath])
[[NSFileManager defaultManager] createDirectoryAtPath:idataPath withIntermediateDirectories:NO attributes:nil error:&error];
// Image Download here
NSString *fileName = [idataPath stringByAppendingFormat:@"/image.jpg"];
NSLog(@"imagePathDOWNLOAD:%@",fileName);
NSData *pdfData1 = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[URLArray objectAtIndex:a]]];
[pdfData1 writeToFile:fileName atomically:YES];
【问题讨论】:
从 Web URL 下载或存储在 Documents 中时需要进度吗? 存储在文档中时 【参考方案1】:你可以使用 NSURLConnection 类来实现进度条:
.h:
NSMutableData *responseData;
NSString *originalFileSize;
NSString *downloadedFileSize;
.m:
- (void)load
NSURL *myURL = [NSURL URLWithString:@""];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:myURL
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
responseData = [[NSMutableData alloc] init];
originalFileSize = [response expectedContentLength];
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
[responseData appendData:data];
downloadedFileSize = [responseData length];
progressBar.progress = ([originalFileSize floatValue] / [downloadedFileSize floatValue]);
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
[responseData release];
[connection release];
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
NSLog(@"Succeeded! Received %d bytes of data",[responseData lengtn]);
如有任何疑问,请告诉我。
【讨论】:
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