（sandbox）沙盒文件获取总结

因为应用是在沙箱（sandbox）中的，在文件读写权限上受到限制，只能在几个目录下读写文件：

Documents：应用中用户数据可以放在这里，iTunes备份和恢复的时候会包括此目录

tmp：存放临时文件，iTunes不会备份和恢复此目录，此目录下文件可能会在应用退出后删除

Library/Caches：存放缓存文件，iTunes不会备份此目录，此目录下文件不会在应用退出删除

第一：获取Documents Library tmp三个文件夹路径

+ (NSString *) folderForHome{

return NSHomeDirectory();

}

+ (NSString *) folderForDocument{

return [[self folderForHome] stringByAppendingPathComponent:@"Documents"];

}

+ (NSString *) folderForLibrary{

return [[self folderForHome] stringByAppendingPathComponent:@"Library"];

}

+ (NSString *) folderForTmp{

return [[self folderForHome] stringByAppendingPathComponent:@"tmp"]

第二：获取文件路径

复制代码

+ (NSString *) pathForBundle:(NSString *)name type:(NSString *)type{

return [[NSBundle mainBundle] pathForResource:name ofType:type];

}

+ (NSString *) pathForDocument:(NSString *)name{

return [[self folderForDocument] stringByAppendingPathComponent:name];

}

+ (NSString *) pathForLibrary:(NSString *)name{

return [[self folderForLibrary] stringByAppendingPathComponent:name];

}

+ (NSString *) pathForTmp:(NSString *)name{

return [[self folderForTmp] stringByAppendingPathComponent:name];

}