博客> NSUserDefaults 各个类型 保持数据 读取数据
NSUserDefaults 各个类型 保持数据 读取数据
2017-08-15 19:14 评论:0 阅读:184 wzt

//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;  

}

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