可以在關閉App後仍能保存物件的NSUserDefaults

//儲存到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]]; 

//將上面的物件儲存到NSUserDefaults中 

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 

//除NSNumber需用對應的型別以外，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"]; 

//建議同步，但是不是必須的 

[userDefaults synchronize]; 

} 

//從NSUserDefaults讀取資料 

-(void)readNSUserDefaults 

{ 

NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults]; 

//讀取數據到各個label中 

//讀取整型int類型的數據 

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

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

//讀取浮點型float類型的數據 

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

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

//讀取double類型的數據 

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

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

//讀取NSString類型的數據 

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

txtNSString.text = myString; 

//讀取NSDate日期類型的數據 

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]]; 

//讀取數組NSArray類型的數據 

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; 

//讀取字典類型NSDictionary類型的數據 

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

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

txtNSDictionary.text = myDicString; 

}