IOS編程中,有沙盒,在沙盒中有4個(gè)儲(chǔ)存你數(shù)據(jù)的地方
1. Doucments文件夾
2.Library文件夾
3.tmp文件夾
4boundle包
下面是具體的例子(有具體注釋):
#import "MainViewController.h"
#import "Book.h"
@interface MainViewController ()
@end
@implementation MainViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
//找沙盒的Documents
NSArray *pathArray =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSLog(@"%@",pathArray);
/*
//找沙盒的Library
NSArray *pathArray1 =NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSLog(@"%@",pathArray1);
//找沙盒的tep
NSString * tmp = NSTemporaryDirectory();
NSLog(@"%@",tmp);
//獲取bundle包內(nèi)文件的路徑
NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"123" ofType:@"png"];
//系統(tǒng)會(huì)把這張照片自動(dòng)緩存到內(nèi)存里面,并且釋放不掉
//? ? [UIImage imageNamed:@"123"];
//一樣可以緩存,會(huì)釋放掉
[UIImage imageWithContentsOfFile:bundlePath];
NSLog(@"%@",bundlePath);
*/
//寫入文件
//字符串寫入
[self stromhWrite];
//數(shù)組寫入
[self arrayWrite];
//字典寫入
[self dicWrite];
//讀取文件
[self readString];
//data寫入
[self writeData];
//讀取data
[self readData];
//歸檔 或叫 序列化
[self writeBookMode];
//解檔 或叫 反序列化
[self readBookMode];
}
#pragma mark -
#pragma mark 寫入文件
#pragma mark 用字符串寫入
- (void)stromhWrite
{
NSArray *docPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [docPath lastObject];
path = [path stringByAppendingString:@"/string.txt"];
NSString *str = @"阿黃\n大笨蛋";
NSError *error = nil;
BOOL judge = [str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error];
if (judge) {
NSLog(@"存儲(chǔ)成功");
} else {
NSLog(@"error == %@",error);
}
}
#pragma mark -
#pragma mark 用數(shù)組寫入
- (void)arrayWrite
{
NSArray *arrPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [arrPath lastObject];
path = [path stringByAppendingString:@"/arr"];
NSArray *arr = [NSArray arrayWithObjects:@"oo",@"11",@"22",@"33", nil];
BOOL judge = [arr writeToFile:path atomically:YES];
NSError *error = nil;
if (judge) {
NSLog(@"存儲(chǔ)成功");
} else {
NSLog(@"error == %@",error);
}
}
#pragma mark -
#pragma mark 用字典寫入
- (void)dicWrite
{
NSArray *arrPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [arrPath lastObject];
path = [path stringByAppendingString:@"/dic"];
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"aaaaa",@"賬號(hào)" , @"bbbbb",@"密碼", nil];
BOOL judge = [dic writeToFile:path atomically:YES];
NSError *error = nil;
if (judge) {
NSLog(@"存儲(chǔ)成功");
} else {
NSLog(@"error == %@",error);
}
}
#pragma mark -
#pragma mark 讀取字符串文件
- (void)readString
{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
path = [path stringByAppendingString:@"/string.txt"];
NSError *error = nil;
NSString *str = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@",str);
if (str) {
NSLog(@"存儲(chǔ)成功");
} else {
NSLog(@"error == %@",error);
}
}
#pragma mark -
#pragma mark 讀取數(shù)組文件
- (void)readArray
{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUTF8StringEncoding, YES) lastObject];
path = [path stringByAppendingString:@"/arr"];
NSArray *arr = [NSArray arrayWithContentsOfFile:path];
NSLog(@"%@",arr);
}
#pragma mark -
#pragma mark 讀取字典文件
- (void)readDic
{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUTF8StringEncoding, YES) lastObject];
path = [path stringByAppendingString:@"/dic"];
NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:path];
NSLog(@"%@",dic);
}
#pragma mark -
#pragma mark 寫入data
- (void)writeData
{
//先把字符串轉(zhuǎn)換成data,然后再存進(jìn)去
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
path = [path stringByAppendingString:@"/data"];
NSString *str = @"hi,阿黃";
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
[data writeToFile:path atomically:YES];
}
#pragma mark -
#pragma mark 讀取data
- (void)readData
{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
path = [path stringByAppendingString:@"/data"];
NSData *data = [NSData dataWithContentsOfFile:path];
NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",str);
}
#pragma mark -
#pragma mark 歸檔與解檔 或叫 序列化和反序列化
#pragma mark 歸檔
- (void)writeBookMode
{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
path = [path stringByAppendingString:@"/book"];
Book *book = [Book bookWithName:@"曉峰的一生" time:@"1937.3.8"];
//對(duì)單獨(dú)對(duì)象的歸檔
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:book];
[data writeToFile:path atomically:YES];
//? ? NSArray * arr = [NSArray arrayWithContentsOfFile:book];
//? ? [arr writeToFile:path atomically:YES];
}
#pragma mark 解檔
- (void)readBookMode
{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
path = [path stringByAppendingString:@"/book"];
NSData *data = [NSData dataWithContentsOfFile:path];
Book *book = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(@"%@ , %@" , book.name , book.time);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
#import
@interface Book : NSObject
@property (nonatomic , retain) NSString *name;
@property (nonatomic , retain) NSString *time;
- (instancetype)initWithName:(NSString *)name time:(NSString *)time ;
+ (Book *)bookWithName:(NSString *)name time:(NSString *)time;
@end
#import "Book.h"
@implementation Book
- (void)dealloc
{
[_time release];
_time = nil;
[_name release];
_name = nil;
[super dealloc];
}
- (instancetype)initWithName:(NSString *)name time:(NSString *)time
{
self = [super init];
if (self) {
self.name = name;
self.time = time;
}
return self;
}
+ (Book *)bookWithName:(NSString *)name time:(NSString *)time
{
Book *book = [[[Book alloc] initWithName:name time:time]autorelease];
return book;
}
//? 歸檔
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeObject:self.time forKey:@"time"];
}
//? 解檔
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super init];
if (self) {
self.name = [aDecoder decodeObjectForKey:@"name"];
self.time = [aDecoder decodeObjectForKey:@"time"];
}
return self;
}
@end
