【发布时间】：2012-02-18 06:18:22
【问题描述】：
我是 iPhone 开发的新手。
我在我的应用程序中集成了 iCloud 存储。我成功地在 iCloud 上上传文件。
我的文档大小约为 126799 字节。在 iCloud 上上传期间，我通过在控制台上打印其长度和内容来确保将正确的文档上传到 iCloud。但是当我从 iCloud 获取文档时，它只给了我该文档内容的 3/4。我还通过打印它的长度和内容在控制台上检查了它。
/////====== variables are declared in interface file
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
NSURL *ubiq = [[NSFileManager defaultManager]
URLForUbiquityContainerIdentifier:nil];
if (ubiq)
{
NSLog(@"iCloud access at %@", ubiq);
// TODO: Load document...
[self loadDocument];
}
else
{
NSLog(@"No iCloud access");
}
}
- (void)loadDocument{
NSMetadataQuery *query = [[NSMetadataQuery alloc] init];
_query = query;
[query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];
NSString *filename = @"supplimentlistdescription.txt";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"%K like '%@'",filename,NSMetadataItemFSNameKey];
[query setPredicate:pred];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(queryDidFinishGathering:)
name:NSMetadataQueryDidFinishGatheringNotification
object:query];
[query startQuery];
}
- (void)queryDidFinishGathering:(NSNotification *)notification {
NSMetadataQuery *query = [notification object];
[query disableUpdates];
[query stopQuery];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:NSMetadataQueryDidFinishGatheringNotification
object:query];
_query = nil;
[self loadData:query];
}
- (void)loadData:(NSMetadataQuery *)query {
if ([query resultCount] == 1)
{
NSMetadataItem *item = [query resultAtIndex:0];
NSURL *url = [item valueForAttribute:NSMetadataItemURLKey];
Note *doc = [[Note alloc] initWithFileURL:url];
self.doc = doc;
[self.doc openWithCompletionHandler:^(BOOL success)
{
if (success)
{
NSLog(@"iCloud document opened");
}
else
{
NSLog(@"failed opening document from iCloud");
}
}
];
}
else
{
NSFileManager *filemgr = [NSFileManager defaultManager];
NSString *fileurlstring = [NSString stringWithFormat:@"Documents/Federal Rules of Civil Procedure"];
NSLog(@"fileurlstring:%@",fileurlstring);
ubiquityURL = [[filemgr URLForUbiquityContainerIdentifier:nil]
URLByAppendingPathComponent:fileurlstring];
[ubiquityURL retain];
NSLog(@"ubiquityURL1:%@",ubiquityURL);
if ([filemgr fileExistsAtPath:[ubiquityURL path]] == NO)
{
[ubiquityURL retain];
[filemgr createDirectoryAtURL:ubiquityURL withIntermediateDirectories:YES attributes:nil error:nil];
[ubiquityURL retain];
}
ubiquityURL = [ubiquityURL URLByAppendingPathComponent:@"supplimentlistdescription.txt"];
[ubiquityURL retain];
NSLog(@"ubiquityURL:%@",ubiquityURL);
Note *doc = [[Note alloc] initWithFileURL:ubiquityURL];
self.doc = doc;
[doc saveToURL:[doc fileURL]
forSaveOperation:UIDocumentSaveForCreating
completionHandler:^(BOOL success)
{
if (success) {
[doc openWithCompletionHandler:^(BOOL success)
{
NSLog(@"new document opened from iCloud");
}
];
}
}
];
}
}
-
///Note.h
#import <UIKit/UIKit.h>
@interface Note : UIDocument
@property (strong) NSString * noteContent;
@end
-
#import "Note.h"
@implementation Note
@synthesize noteContent;
- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName
error:(NSError **)outError
{
if ([contents length] > 0)
{
self.noteContent = [[NSString alloc]
initWithBytes:[contents bytes]
length:[contents length]
encoding:NSUTF8StringEncoding];
NSLog(@"loadFromContents1");
NSLog(@"noteContent:%@",noteContent);
NSLog(@"noteContent.length:%d",noteContent.length);
}
else
{
// When the note is first created, assign some default content
self.noteContent = @"Empty";
}
return YES;
}
- (id)contentsForType:(NSString *)typeName error:(NSError **)outError
{
if ([self.noteContent length] == 0)
{
//self.noteContent = @"Empty";
NSString *FolderName = @"Federal Rules of Civil Procedure";
NSString *fileName = @"supplimentlistdescription.txt";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
[FolderName retain];
NSString *fileName1 = [NSString stringWithFormat:@"%@/%@/%@",documentsDirectory,FolderName, fileName];
NSLog(@"fileName1:%@",fileName1);
NSData *data = [[NSData alloc]initWithContentsOfFile:fileName1];
noteContent =[[NSString alloc]initWithData:data encoding:NSMacOSRomanStringEncoding];
NSLog(@"noteContent:%@",noteContent);
NSLog(@"noteContent.length:%d",noteContent.length);
}
return [NSData dataWithBytes:[self.noteContent UTF8String]
length:[self.noteContent length]];
}
@end
你能告诉我可能是什么问题吗？任何建议将不胜感激。谢谢
【问题讨论】：
-
您可能需要展示一些代码才能获得解决方案。
-
我已经添加了代码。请检查一下，让我知道代码有什么问题。谢谢
-
我看到的唯一“明显”的事情就在最后，您正在使用来自 utf8 字符串的字节和 noteContent 的长度执行 [NSData dataWithBytes:length:]。 UTF-8 的字节长度不一定与 NSString 的长度相同。除此之外，遗憾的是，在调试器中发现这个问题可能比阅读代码更容易。
-
感谢您的回复。我还没有得到解决方案。我该如何解决这个问题？长度不是问题，但至少整个文本文档内容应该对我可见，但我没有得到它。请以其他方式帮助我。
标签： iphone ios ipad document icloud