iOS-NSUserDefaults(本地存储开发常用)

- (void)viewDidUnload

{

[txtNSString release];

txtNSString = nil;

[txtNSDate release];

txtNSDate = nil;

[txtNSArray release];

txtNSArray = nil;

[txtNSDictionary release];

txtNSDictionary = nil;

[txtInteger release];

txtInteger = nil;

[txtFloat release];

txtFloat = nil;

[txtDouble release];

txtDouble = nil;

[super viewDidUnload];

// Release any retained subviews of the main view.

}

//保存数据到NSUserDefaults

-(void)saveNSUserDefaults

{

NSString *myString = @"enuola";

int myInteger = 100;

float myFloat = 50.0f;

double myDouble = 20.0;

NSDate *myDate = [NSDate date];

NSArray *myArray = [NSArray arrayWithObjects:@"hello", @"world", nil];

NSDictionary *myDictionary = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"enuo", @"20", nil] forKeys:[NSArray arrayWithObjects:@"name", @"age", nil]];

//将上述数据全部存储到NSUserDefaults中

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

//存储时，除NSNumber类型使用对应的类型意外，其他的都是使用setObject:forKey:

[userDefaults setInteger:myInteger forKey:@"myInteger"];

[userDefaults setFloat:myFloat forKey:@"myFloat"];

[userDefaults setDouble:myDouble forKey:@"myDouble"];

[userDefaults setObject:myString forKey:@"myString"];

[userDefaults setObject:myDate forKey:@"myDate"];

[userDefaults setObject:myArray forKey:@"myArray"];

[userDefaults setObject:myDictionary forKey:@"myDictionary"];

//这里建议同步存储到磁盘中，但是不是必须的

[userDefaults synchronize];

}

//从NSUserDefaults中读取数据

-(void)readNSUserDefaults

{

NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults];

//读取数据到各个label中

//读取整型int类型的数据

NSInteger myInteger = [userDefaultes integerForKey:@"myInteger"];

txtInteger.text = [NSString stringWithFormat:@"%d",myInteger];

//读取浮点型float类型的数据

float myFloat = [userDefaultes floatForKey:@"myFloat"];

txtFloat.text = [NSString stringWithFormat:@"%f",myFloat];

//读取double类型的数据

double myDouble = [userDefaultes doubleForKey:@"myDouble"];

txtDouble.text = [NSString stringWithFormat:@"%f",myDouble];

//读取NSString类型的数据

NSString *myString = [userDefaultes stringForKey:@"myString"];

txtNSString.text = myString;

//读取NSDate日期类型的数据

NSDate *myDate = [userDefaultes valueForKey:@"myDate"];

NSDateFormatter *df = [[NSDateFormatter alloc] init];

[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

txtNSDate.text = [NSString stringWithFormat:@"%@",[df stringFromDate:myDate]];

//读取数组NSArray类型的数据

NSArray *myArray = [userDefaultes arrayForKey:@"myArray"];

NSString *myArrayString = [[NSString alloc] init];

for(NSString *str in myArray)

{

NSLog(@"str= %@",str);

myArrayString = [NSString stringWithFormat:@"%@  %@", myArrayString, str];

[myArrayString stringByAppendingString:str];

//        [myArrayString stringByAppendingFormat:@"%@",str];

NSLog(@"myArrayString=%@",myArrayString);

}

txtNSArray.text = myArrayString;

//读取字典类型NSDictionary类型的数据

NSDictionary *myDictionary = [userDefaultes dictionaryForKey:@"myDictionary"];

NSString *myDicString = [NSString stringWithFormat:@"name:%@, age:%d",      [myDictionary valueForKey:@"name"], [[myDictionary valueForKey:@"age"] integerValue]];

txtNSDictionary.text = myDicString;

}