代码：
#import<Foundation/Foundation.h>//NSString 写文件voidstringWriteToFile(){
NSString*path = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/test.txt"];
NSString*s =@"test";
[s writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
NSString*str =[[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSLog(@"\nstring = %@",str);
NSString*testtxt =[[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSLog(@"\ntest.text = %@",testtxt);
}//NSArray 写文件voidarrayWriteToFile(){
NSArray*arr = @[@"a",@"b",@"b",@"c"];
NSString*path = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/test2.txt"];
[arr writeToFile:path atomically:YES];
NSArray*a =[[NSArray alloc] initWithContentsOfFile:path];
NSLog(@"array = \n%@",a);
NSString*s =[[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSLog(@"\ntest2.txt = \n%@",s);
}//NSDictionary 写文件voiddictionaryWriteToFile(){
NSDictionary*dic = @{@"a":@"1",@"b":@"2",@"c":@"3",@"d":@"4"};
NSString*path = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/test3.txt"];
[dic writeToFile:path atomically:YES];
NSDictionary*d =[[NSDictionary alloc] initWithContentsOfFile:path];
NSLog(@"\ndictionary = \n%@",d);
NSString*s =[[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSLog(@"\ntest3.txt = \n%@",s);
}//atomically 是否原子级 即事务性写入//NSNumber、NSDate、NSData都可以通过writeToFile写入文件，该文件为纯文本类型，如果将后缀名改为plist即为xcode属性列表文件intmain(intargc,constchar*argv[]) {//该方法是创建一个实例，但是使的NSFileManager的单例模式将失去效果NSFileManager *fm0 =[[NSFileManager alloc] init];//defaultManager使用单例模式创建NSFileManager对象NSFileManager *fm1 =[NSFileManager defaultManager];
NSFileManager*fm2 =[NSFileManager defaultManager];
NSLog(@"\nfm0 = %p,fm1 = %p,fm2 = %p",fm0,fm1,fm2);
NSData*data = [[NSString stringWithFormat:@"main"] dataUsingEncoding:NSUTF8StringEncoding];
NSString*path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/main.txt"];if(![fm1 fileExistsAtPath:path]) {if([fm1 createFileAtPath:path contents: data attributes:nil]) {
NSLog(@"create success");
NSDictionary*d =[fm1 attributesOfItemAtPath:path error:nil];
NSLog(@"\nattributesOfItemAtPath = \n%@",d);//NSFileSize是预定义的文件属性key，可通过查看系统文件获取其他属性key并通过//以下方法获取其属性值NSNumber *filesize =[d valueForKey:NSFileSize];
NSLog(@"\nfilesize = %@",filesize);//读文件NSData *data1 =[fm1 contentsAtPath:path];
NSString*s =[[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding];//文件系统的属性//总空间，已用空间，可用空间，文件数量，NSLog(@"\nattributesOfFileSystemForPath = \n%@",[fm1 attributesOfFileSystemForPath:path error:nil]);
NSLog(@"\nmain.txt = %@",s);
}
}else{
NSString*copypath = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/main_copy.txt"];
[fm1 copyItemAtPath:path toPath:copypath error:nil];//重命名可以目标路径与主路径一致但是文件名不同NSString *movepath = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/main_move.txt"];
[fm1 moveItemAtPath:path toPath:movepath error:nil];//删除文件if([fm1 removeItemAtPath:path error:nil]) {
NSLog(@"remove %@ success",path);
}if([fm1 removeItemAtPath:copypath error:nil]) {
NSLog(@"remove %@ success",copypath);
}if([fm1 removeItemAtPath:movepath error:nil]) {
NSLog(@"remove %@ success",movepath);
}
}
stringWriteToFile();
arrayWriteToFile();
dictionaryWriteToFile();return0;
}
结果：
2015-03-0821:18:26.064NSFileManagerDemo[1686:79942]
fm0=0x1001145d0,fm1 =0x100114620,fm2 =0x1001146202015-03-0821:18:26.075NSFileManagerDemo[1686:79942] remove /Users/yoran_yang/Documents/main_copy.txt success2015-03-0821:18:26.076NSFileManagerDemo[1686:79942] remove /Users/yoran_yang/Documents/main_move.txt success2015-03-0821:18:26.076NSFileManagerDemo[1686:79942]string=test2015-03-0821:18:26.077NSFileManagerDemo[1686:79942]
test.text=test2015-03-0821:18:26.078NSFileManagerDemo[1686:79942] array =(
a,
b,
b,
c
)2015-03-0821:18:26.078NSFileManagerDemo[1686:79942]
test2.txt=
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC"-//Apple//DTD PLIST 1.0//EN""http://www.apple.com/DTDs/PRopertyList-1.0.dtd">
<plist version="1.0">
<array>
<string>a</string>
<string>b</string>
<string>b</string>
<string>c</string>
</array>
</plist>2015-03-0821:18:26.079NSFileManagerDemo[1686:79942]
dictionary={
a=1;
b=2;
c=3;
d=4;
}2015-03-0821:18:26.079NSFileManagerDemo[1686:79942]
test3.txt=
<?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC"-//Apple//DTD PLIST 1.0//EN""http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>a</key>
<string>1</string>
<key>b</key>
<string>2</string>
<key>c</key>
<string>3</string>
<key>d</key>
<string>4</string>
</dict>
</plist>Program ended with exit code:0