iOS文件操作

文件路径

NSSearchPathForDirectoriesInDomain

NSSearchPathDirectory directory:



NSSearchPathDomainMask domainMask:



BOOL expandTilde:

当DomainMask为NSUserDomainMask时，

设为YES，显示完整明确路径为：/Users/jolie/Desktop

设为No时，显示为: ~/Desktop

eg:

NSString *path = [NSSearchPathForDirectoriesInDomains(NSApplicationDirectory, NSAllDomainsMask, NO) firstObject];

stringByAppendingPathComponent

NSString *path = [str stringByAppendingPathComponent:@"Jolie/hello.test"];

读取文件

读取文件分为两种，一种是读取本地文件或者缓存文件，另一种是读取工程中的文件，比如plist配置文件等。

读取本地文件

NSArray *array = [NSArray arrayWithContentsOfFile:path];
NSArray *array = [NSArray arrayWithContentsOfURL:[NSURL URLWithString:path]];

NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];

NSData *data = [[NSData alloc] initWithContentsOfFile:path];
NSData *data = [NSData dataWithContentsOfFile: path];

NSString *string = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

读取工程文件

NSString *path = [[NSBundle mainBundle] pathForResource:@"hello" ofType:@"plist"];

// 读取类似于缓存文件的读取
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];

写数据

新建文件夹

NSString *folderDir = [desktopDirs[0] stringByAppendingPathComponent:@"CocoaCool"];
[fileManager createDirectoryAtPath:folderDir withIntermediateDirectories:YES attributes:nil error:nil];

写数据道文件中

// m1
NSData *data = ....
[data writeToFile:desktopDir atomically:YES];

NSDictionary *dict = ...
[dict writeToFile:desktopDir atomically: YES];
// m2
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager createFileAtPath:desktopDir contents:data attributes:nil];
// m3 加锁了
[NSKeyedArchiver archiveRootObject:data toFile:desktopDir];