- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

// 读取Documents目录代码

NSArray *pathsDocuments=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *pathDocuments=[pathsDocuments objectAtIndex:0];

//    NSLog(@"pathDocuments~~~~~~%@    pathsDocuments----%@",pathDocuments,pathsDocuments);

/*

pathDocuments~~~~~~/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/12EA0817-D2C0-40E5-B3CC-1EB642FCDF9F/Documents    pathsDocuments----(

"/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/12EA0817-D2C0-40E5-B3CC-1EB642FCDF9F/Documents"

)

*/

// 读取Cache目录代码

NSArray *pathsCache=NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);

NSString *pathCache=[pathsCache objectAtIndex:0];

//    NSLog(@"pathCache~~~~~~%@    pathsCache----%@",pathsCache,pathCache);

/*

pathCache~~~~~~(

"/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/823489C8-00DA-403B-95AB-76C8FBE8AAAA/Library/Caches"

)    pathsCache----/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/823489C8-00DA-403B-95AB-76C8FBE8AAAA/Library/Caches

*/

// 读取Library目录

NSArray *pathsLibrary=NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask, YES);

NSString *pathLibrary=[pathsLibrary objectAtIndex:0];

//    NSLog(@"pathsLibrary~~~~~~%@    pathLibrary----%@",pathsLibrary,pathLibrary);

/*

pathsLibrary~~~~~~(

"/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/05969A2D-E6BD-4F4B-A57E-4414D987D240/Library"

)    pathLibrary----/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/05969A2D-E6BD-4F4B-A57E-4414D987D240/Library

*/

// 读取temp文件夹

NSString *tempDir=NSTemporaryDirectory();

//    NSLog(@"tempDir~~~%@",tempDir);

/*

tempDir~~~/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Data/Application/CEF70855-6285-46D9-B7BF-B4C9AAB1816B/tmp/

*/

// 项目自带的.bundle资源库放在.bundle中这些资源只读不能写

NSString *defaultDBPath=[[NSBundle mainBundle] resourcePath];

NSLog(@"defaultDBPath~~%@",defaultDBPath);

/*

defaultDBPath~~/Users/yhj/Library/Developer/CoreSimulator/Devices/65FC33FE-6234-427B-A4F2-4F22ACE36842/data/Containers/Bundle/Application/D94DD7F5-0CE9-4EEF-8E47-37C4737EF2CF/IOS沙盒Files目录说明和常用操作.app

*/

// 可以保证app的documents文件内容不备份到icloud上

[self addSkipBackupAttributeToItemAtURL:[NSURL fileURLWithPath:pathDocuments]];

return YES;

}

// 用NSURLIsExcludedFromBackupKey 或 kCFURLIsExcludedFromBackupKey 文件属性来防止文件被备份。这些API是通过通过旧的，弃用的方式的直接设置额外属性。所有运行在iOS5.1的都应该使用这些API包防止文件被备份。在iOS5 .1上防止文件被备份

-(BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL

{

assert([[NSFileManager defaultManager] fileExistsAtPath:[URL path]]);

NSError *error=nil;

BOOL success=[URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];

if (!success) {

NSLog(@"Error excluding %@ from backup %@",[URL lastPathComponent],error);

}

return success;

}