#import "ViewController.h"

@interface ViewController ()

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// 1.捆绑包目录

NSLog(@"bundlePath %@",[NSBundle mainBundle].bundlePath);

// 2.沙盒主目录

NSString *homeDir = NSHomeDirectory();

NSLog(@"homeDir %@",homeDir);

// 3.Documents目录

NSLog(@"Documents url %@",[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask].firstObject);

NSLog(@"Documents pathA %@",NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject);

NSLog(@"Documents pathB %@",[homeDir stringByAppendingPathComponent:@"Documents"]);

// 4.Library目录

NSLog(@"Library url %@",[[NSFileManager defaultManager] URLsForDirectory:NSLibraryDirectory inDomains:NSUserDomainMask].firstObject);

NSLog(@"Library pathA %@",NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).firstObject);

NSLog(@"Library pathB %@",[homeDir stringByAppendingPathComponent:@"Library"]);

// 5.Caches目录

NSLog(@"Caches url %@",[[NSFileManager defaultManager] URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask].firstObject);

NSLog(@"Caches path %@",NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject);

// 6.tep目录

NSLog(@"tmpA %@",NSTemporaryDirectory());

NSLog(@"tmpB %@",[homeDir stringByAppendingPathComponent:@"tmp"]);

// 创建文件管理器

NSFileManager *sharedFM = [NSFileManager defaultManager];

// 创建NSURL类型documentsURL路径 转换为NSString类型和fileReferenceURL类型路径

NSURL *documentsURL = [sharedFM URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask].firstObject;

NSLog(@"documentsURL:%@",documentsURL);

NSLog(@"documentsURL convert to path:%@",documentsURL.path);

NSLog(@"fileReferenceURL:%@",[documentsURL fileReferenceURL]);

// 创建NSString类型libraryPath路径 转换为NSURL类型路径

NSString *libraryPath = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).firstObject;

NSLog(@"libraryPath:%@",libraryPath);

NSLog(@"libraryPath convert to url:%@",[NSURL fileURLWithPath:libraryPath]);

// 创建目录

NSURL *bundleIDDir = [self applicationDirectory];

// 复制目录

[self backupMyApplicationDataWithURL:bundleIDDir];

// 一次枚举一个对象

[self performSelector:@selector(enumerateOneFileAtATimeAtURL:) withObject:bundleIDDir afterDelay:0.3];

// 一次枚举整个目录

[self performSelector:@selector(enumerateAllAtOnceAtURL:) withObject:bundleIDDir afterDelay:0.3];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (NSURL *)applicationDirectory {

// 1.创建文件管理器

NSFileManager *sharedFM = [NSFileManager defaultManager];

// 2.查找Application Support目录在主目录路径

NSArray *possibleURLs = [sharedFM URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask];

NSURL *appSupportDir = nil;

NSURL *dirPath = nil;

if (possibleURLs.count > 0) {

// 3.数组不为空时，使用第一个元素。

appSupportDir = possibleURLs.firstObject;

}

// 4.如果存在appSupportDir目录 将应用的bundleIdentifier添加到文件结尾 用于创建自定义目录

if (appSupportDir) {

NSString *appBundleID = [[NSBundle mainBundle] bundleIdentifier];

dirPath = [appSupportDir URLByAppendingPathComponent:appBundleID];

}

// 5.如果dirPath目录不存在 创建该目录

NSError *error = nil;

if (![sharedFM createDirectoryAtURL:dirPath withIntermediateDirectories:YES attributes:nil error:&error]) {

NSLog(@"Couldn't create dirPath.error %@",error);

return nil;

}

return dirPath;

}

- (void)backupMyApplicationDataWithURL:(NSURL *)bundleIDDir {

NSFileManager *sharedFM = [NSFileManager defaultManager];

// 1.获得源文件、备份文件路径。如果源文件不存在，则创建源文件。

NSURL *appDataDir = [bundleIDDir URLByAppendingPathComponent:@"Data"];

NSURL *backupDir = [appDataDir URLByAppendingPathExtension:@"backup"];

if (![sharedFM fileExistsAtPath:appDataDir.path]) {

if (![sharedFM createDirectoryAtURL:appDataDir withIntermediateDirectories:YES attributes:nil error:nil]) {

NSLog(@"Couldn't create appDataDir");

return;

}

}

// 2.异步执行复制

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

// 3.使用init方法初始化文件管理器，以便后面可能用到代理方法。

NSFileManager *theFM = [[NSFileManager alloc] init];

NSError *anError;

// 4.尝试复制文件

if (![theFM copyItemAtURL:appDataDir toURL:backupDir error:&anError]) {

// 5.如果复制失败，可能是backupDir已经存在，删除旧的backupDir文件

if ([theFM removeItemAtURL:backupDir error:&anError]) {

// 6.再次复制，如果失败，终止复制操作。

if (![theFM copyItemAtURL:appDataDir toURL:backupDir error:&anError]) {

NSLog(@"anError:%@",anError);

}

}

}

});

}

- (void)enumerateOneFileAtATimeAtURL:(NSURL *)enumerateURL {

NSArray *keys = [NSArray arrayWithObjects:NSURLIsDirectoryKey, NSURLLocalizedNameKey, nil];

NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtURL:enumerateURL

includingPropertiesForKeys:keys

options:NSDirectoryEnumerationSkipsSubdirectoryDescendants | NSDirectoryEnumerationSkipsHiddenFiles

errorHandler:^BOOL(NSURL * _Nonnull url, NSError * _Nonnull error) {

// 1.遇到错误时输出错误，并继续递归。

if (error) {

NSLog(@"[error] %@ %@",error, url);

}

return YES;

}];

for (NSURL *url in enumerator) {

NSNumber *isDirectory = nil;

NSError *error;

if (![url getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:&error]) {

NSLog(@"%@ %@",error, url);

}

if (isDirectory.boolValue) {

// // 2.扩展名为backup时，跳过递归。

// if ([url.pathExtension isEqualToString:@"backup"]) {

// [enumerator skipDescendants];

// continue;

// }

NSString *localizedName = nil;

if ([url getResourceValue:&localizedName forKey:NSURLLocalizedNameKey error:NULL]) {

NSLog(@"Directory at %@",localizedName);

}

}

}

}

- (void)enumerateAllAtOnceAtURL:(NSURL *)enumerateURL {

NSError *error;

NSArray *properties = [NSArray arrayWithObjects:NSURLLocalizedNameKey, NSURLCreationDateKey, NSURLLocalizedTypeDescriptionKey, nil];

NSArray *contents = [[NSFileManager defaultManager] contentsOfDirectoryAtURL:enumerateURL

includingPropertiesForKeys:properties

options:NSDirectoryEnumerationSkipsHiddenFiles

error:&error];

if (error) {

NSLog(@"Couldn't enumerate directory. error:%@",error);

}

for (NSURL *url in contents) {

NSDate *yesterday = [NSDate dateWithTimeIntervalSinceNow:(-24*60*60)];

// 1.获取项目的文件属性，使用NSURLCreationDateKey键提取文件创建日期

NSDictionary *attributes = [[NSFileManager defaultManager] attributesOfItemAtPath:url.path error:nil];

NSDate *lastModificationDate = [attributes valueForKey:NSURLCreationDateKey];

// 2.如果文件在24小时内创建 输出文件路径到控制台。

if ([yesterday earlierDate:lastModificationDate] == yesterday) {

NSLog(@"%@ was modified within the last 24 hours", url);

}

}

}