Iphone 保存在NSDocumentDirectory或NSCachesDirectory中
已尝试将我的Iphone 保存在NSDocumentDirectory或NSCachesDirectory中,iphone,objective-c,ios,Iphone,Objective C,Ios,已尝试将我的NSMutableArray对象存储到NSUserDefaults中,但没有成功。 我的NSMutableArray在此处包含此日志: `ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=92A7A24F-D54B-496E-B250-542BBE37BE8C&ext=JPG` 我知道它是一个ALAsset对象,在AGImagePickerController中,它被比较为NSDictionary,
NSMutableArray
对象存储到NSUserDefaults
中,但没有成功。
我的NSMutableArray
在此处包含此日志:
`ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=92A7A24F-D54B-496E-B250-542BBE37BE8C&ext=JPG`
我知道它是一个ALAsset对象
,在AGImagePickerController
中,它被比较为NSDictionary,因此我需要做的是保存NSDictionary或我用来存储ALAsset对象的数组
,然后将其保存在NSDocu
或NSCaches
中作为文件,然后再次检索它(这是我的主意)
但问题是,尽管我尝试了这段代码,但没有工作,并且在NSDocu
或NSCache
目录中没有显示任何内容
第一次尝试(info
是包含ALAsset对象
)的:
第二次尝试:
- (NSString *)createEditableCopyOfFileIfNeeded:(NSString *)_filename {
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableFilePath = [documentsDirectory stringByAppendingPathComponent: _filename ];
success = [fileManager fileExistsAtPath:writableFilePath];
if (success) return writableFilePath;
// The writable file does not exist, so copy the default to the appropriate location.
NSString *defaultFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: _filename ];
success = [fileManager copyItemAtPath:defaultFilePath toPath:writableFilePath error:&error];
if (!success) {
NSLog([error localizedDescription]);
NSAssert1(0, @"Failed to create writable file with message '%@'.", [error localizedDescription]);
}
return writableFilePath;
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:??????];
[info writeToFile:filePath atomically:YES];
这样保存它:
NSString *writableFilePath = [self createEditableCopyOfFileIfNeeded:[NSString stringWithString:@"hiscores"]];
if (![info writeToFile:writableFilePath atomically:YES]){
NSLog(@"WRITE ERROR");
}
第三次尝试:
- (NSString *)createEditableCopyOfFileIfNeeded:(NSString *)_filename {
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableFilePath = [documentsDirectory stringByAppendingPathComponent: _filename ];
success = [fileManager fileExistsAtPath:writableFilePath];
if (success) return writableFilePath;
// The writable file does not exist, so copy the default to the appropriate location.
NSString *defaultFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: _filename ];
success = [fileManager copyItemAtPath:defaultFilePath toPath:writableFilePath error:&error];
if (!success) {
NSLog([error localizedDescription]);
NSAssert1(0, @"Failed to create writable file with message '%@'.", [error localizedDescription]);
}
return writableFilePath;
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:??????];
[info writeToFile:filePath atomically:YES];
第四次尝试(不确定,因为它在appbundle中被修改):
还有其他方法吗?希望有人能指导我。您可以通过将NSMutableArray存档到NSData将其存储到NSSERDEFAULT,而不是通过将其解压缩回NSMutableArray来检索它
-(NSData*) getArchievedDataFromArray:(NSMutableArray*)arr
{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr];
return data;
}
-(NSMutableArray*) getArrayFromArchievedData:(NSData*)data
{
NSMutableArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data];
return arr;
}
要将数组保存为NSUserDefault,请执行以下操作:
[[NSUserDefaults standardUserDefaults] setObject:[self getArchievedDataFromArray: yourArray] forKey:@"YourKey"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSMutableArray *yourArray = [self getArrayFromArchievedData:[[NSUserDefaults standardUserDefaults]objectForKey:@"YourKey"]];
要从NSUserDefault检索回阵列,请执行以下操作:
[[NSUserDefaults standardUserDefaults] setObject:[self getArchievedDataFromArray: yourArray] forKey:@"YourKey"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSMutableArray *yourArray = [self getArrayFromArchievedData:[[NSUserDefaults standardUserDefaults]objectForKey:@"YourKey"]];
您还可以将数组以NSData的形式保存到NSDocumentDirectory或NSCachesDirectory中的文件中。希望这对您有所帮助
已编辑:UIImage+N编码类别
.h文件
#import <UIKit/UIKit.h>
@interface UIImage (NSCoding)
- (id) initWithCoderForArchiver:(NSCoder *)decoder;
- (void) encodeWithCoderForArchiver:(NSCoder *)encoder ;
@end
#导入
@接口UIImage(NSCoding)
-(id)initWithCoderForArchiver:(NSCoder*)解码器;
-(void)encodeWithCoderForArchiver:(NSCoder*)编码器;
@结束
.m文件
#import "UIImage+NSCoding.h"
#import <objc/runtime.h>
#define kEncodingKey @"UIImage"
@implementation UIImage (NSCoding)
+ (void) load
{
@autoreleasepool {
if (![UIImage conformsToProtocol:@protocol(NSCoding)]) {
Class class = [UIImage class];
if (!class_addMethod(
class,
@selector(initWithCoder:),
class_getMethodImplementation(class, @selector(initWithCoderForArchiver:)),
protocol_getMethodDescription(@protocol(NSCoding), @selector(initWithCoder:), YES, YES).types
)) {
NSLog(@"Critical Error - [UIImage initWithCoder:] not defined.");
}
if (!class_addMethod(
class,
@selector(encodeWithCoder:),
class_getMethodImplementation(class, @selector(encodeWithCoderForArchiver:)),
protocol_getMethodDescription(@protocol(NSCoding), @selector(encodeWithCoder:), YES, YES).types
)) {
NSLog(@"Critical Error - [UIImage encodeWithCoder:] not defined.");
}
}
}
}
- (id) initWithCoderForArchiver:(NSCoder *)decoder {
if (self = [super init]) {
NSData *data = [decoder decodeObjectForKey:kEncodingKey];
self = [self initWithData:data];
}
return self;
}
- (void) encodeWithCoderForArchiver:(NSCoder *)encoder {
NSData *data = UIImagePNGRepresentation(self);
[encoder encodeObject:data forKey:kEncodingKey];
}
@end
#导入“UIImage+NSCoding.h”
#进口
#定义kEncodingKey@“UIImage”
@实现UIImage(NSCoding)
+(空)荷载
{
@自动释放池{
如果(![UIImage conformsToProtocol:@协议(NSCoding)]){
Class Class=[UIImage Class];
if(!class_addMethod)(
类,
@选择器(initWithCoder:),
类_getMethodImplementation(类,@selector(initWithCoderForArchiver:),
协议_getMethodDescription(@protocol(NSCoding),@selector(initWithCoder:),YES,YES)。类型
)) {
NSLog(@“严重错误-[UIImage initWithCoder:]未定义”);
}
if(!class_addMethod)(
类,
@选择器(编码器和编码器:),
类_getMethodImplementation(类,@selector(encodeWithCoderForArchiver:),
协议\u getMethodDescription(@protocol(NSCoding),@selector(encodeWithCoder:),YES,YES)。类型
)) {
NSLog(@“严重错误-[UIImage EncoderWithCoder:]未定义”);
}
}
}
}
-(id)initWithCoderForArchiver:(NSCoder*)解码器{
if(self=[super init]){
NSData*data=[decoder decodeObjectForKey:kEncodingKey];
self=[self initWithData:data];
}
回归自我;
}
-(void)encodeWithCoderForArchiver:(NSCoder*)编码器{
NSData*data=UIIMAGEPNGRE表示(自我);
[编码器编码对象:数据分叉:kEncodingKey];
}
@结束
这是我用来存储数组或字典对象的方法
- (NSArray*)readPlist
{
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *plistPath = [[documentPaths lastObject] stringByAppendingPathComponent:@"filename.plist"];
NSFileManager *fMgr = [NSFileManager defaultManager];
if (![fMgr fileExistsAtPath:plistPath]) {
[self writePlist:[NSArray array]];
}
return [NSArray arrayWithContentsOfFile:plistPath];
}
- (void)writePlist:(NSArray*)arr
{
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *plistPath = [[documentPaths lastObject] stringByAppendingPathComponent:@"filename.plist"];
NSFileManager *fMgr = [NSFileManager defaultManager];
if ([fMgr fileExistsAtPath:plistPath])
[fMgr removeItemAtPath:plistPath error:nil];
[arr writeToFile:plistPath atomically:YES];
}
“writeToFile:atomically:”方法的NSArray文档显示,所有成员都必须是属性列表对象。ALAsset不是属性列表对象,因此将其写入文件是行不通的 我知道它是一个ALAsset对象,在AGImagePickerController中它是 与词典相比 如果仔细观察,您会发现它不会比较ALAsset,而是比较它们的“ALAssetPropertyURLs”属性。该属性的值是一个NSDictionary 由于ALAsset没有公共构造函数,因此在读取文件或nsUserDefault后无法重建它,即使您成功地编写了它 因此,您可以做的最好的事情是从最初获取ALASSET的源中重新获取它们。我假设这是一个ALASSETGROUP?与其保存到文件并再次检索,不如在ALASSETGROUP上使用与最初生成它们相同的查询重新生成它们 编辑:
- (NSString *)createEditableCopyOfFileIfNeeded:(NSString *)_filename {
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableFilePath = [documentsDirectory stringByAppendingPathComponent: _filename ];
success = [fileManager fileExistsAtPath:writableFilePath];
if (success) return writableFilePath;
// The writable file does not exist, so copy the default to the appropriate location.
NSString *defaultFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: _filename ];
success = [fileManager copyItemAtPath:defaultFilePath toPath:writableFilePath error:&error];
if (!success) {
NSLog([error localizedDescription]);
NSAssert1(0, @"Failed to create writable file with message '%@'.", [error localizedDescription]);
}
return writableFilePath;
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:??????];
[info writeToFile:filePath atomically:YES];
所以你说你从AGImagePickerController那里得到了原始的ALAsset。为了存储它们,你可以在评论中接受Matej的建议并存储识别它们的URL
但请记住,AGImagePickerController是一种让用户挑选大量照片,然后对其进行处理的方法。也就是说,这些照片集只是指向照片原始位置的中间结果。如果您存储URL并在以后检索它们,则根本无法保证原始照片他们仍然在那里
因此,问问自己:您希望用户对照片做什么,并存储该操作的结果,而不是资产本身。例如,您可以做的一个合理的操作是创建一个新的ALAssetGroup(使用AlasSetLibrary上的AddAssetGroupAlbumWithName:方法),并将资产存储在其中。设置组会自动保存,因此您无需自行执行任何操作
编辑2-在OP提供更多信息之后
Matej在注释中暗示的是,通过从资产中检索URL,将您拥有的集合数组转换为字典数组。正如您在中所读到的,您可以通过以下方式进行转换:
NSArray *assetArray = // your array of ALAssets
NSMutableArray *urls = [NSMutableArray arrayWithCapacity:assetArray.count];
for( ALAsset *asset in assetArray ) {
NSDictionary *urlDictionary = [asset valueForProperty:@"ALAssetPropertyURLs"];
[urls addObject:urlDictionary];
}
生成的字典数组,您可以用任何方式保存
重新启动应用程序后,从存储字典的位置读取字典数组。然后Matej建议使用ALAsse