学步园

自定义对象：

.h文件

#import <Foundation/Foundation.h>  
  
@interface MyObject : NSObject  
{  
    NSNumber* lowValue;  
    NSNumber* highValue;  
      
    NSString* titleString;  
}  
@property(nonatomic, retain)NSNumber* lowValue;  
@property(nonatomic, retain)NSNumber* highValue;  
  
@property(nonatomic, retain)NSString* titleString;  
@end  

.m文件：

#import "MyObject.h"  
  
@implementation MyObject  
@synthesize lowValue, highValue, titleString;  
- (void)encodeWithCoder:(NSCoder *)encoder   
{  
    [encoder encodeObject:self.lowValue forKey:@"lowValue"];  
    [encoder encodeObject:self.highValue forKey:@"highValue"];  
    [encoder encodeObject:self.titleString forKey:@"titleString"];  
}  
- (id)initWithCoder:(NSCoder *)decoder   
{  
    if(self = [super init])  
    {  
        self.lowValue = [decoder decodeObjectForKey:@"lowValue"];  
        self.highValue = [decoder decodeObjectForKey:@"highValue"];  
        self.titleString = [decoder decodeObjectForKey:@"titleString"];  
    }  
    return  self;  
}  
  
@end 

保存单个MyObject方法:

- (void)saveCustomObject:(MyObject *)obj   
{  
    NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:obj];  
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];  
    [defaults setObject:myEncodedObject forKey:@"myEncodedObjectKey"];  
}  
- (MyObject *)loadCustomObjectWithKey:(NSString *)key   
{  
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];  
    NSData *myEncodedObject = [defaults objectForKey:key];  
    MyObject *obj = (MyObject *)[NSKeyedUnarchiver unarchiveObjectWithData: myEncodedObject];  
    return obj;  
}  
  
保存：  
        MyObject* testObj = [[MyObject alloc] init];  
        testObj.lowValue  =[NSNumber  numberWithFloat:122.2 ];  
        testObj.highValue = [NSNumber numberWithFloat:19888 ];  
        testObj.titleString = @“baoyu”;  
  
读取：  
    MyObject* obj = [self loadCustomObjectWithKey:@"myEncodedObjectKey"];  
    NSLog(@"%f, %f, %@", [obj.lowValue floatValue], [obj.highValue floatValue], obj.titleString); 

保存多个MyObject方法：

保存：  
    NSMutableArray* array = [[NSMutableArray alloc] init];  
    for(int i=0; i<3; i++)  
    {  
        MyObject* testObj = [[MyObject alloc] init];  
        testObj.lowValue  =[NSNumber  numberWithFloat:122.2+i ];  
        testObj.highValue = [NSNumber numberWithFloat:19888+i ];  
        testObj.titleString = [NSString stringWithFormat:@"BAOYU%d", i];  
          
        [array addObject:testObj];  
  
    }  
 [[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:array] forKey:@"myarray"];  
  
  
读取：  
        NSData* data  = [[NSUserDefaults standardUserDefaults] objectForKey:@"myarray"];  
      
  
    NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];  
    for(MyObject* obj in oldSavedArray)  
    {  
        NSLog(@"%f, %f, %@", [obj.lowValue floatValue], [obj.highValue floatValue], obj.titleString);  
    }  

转载自：http://zani.iteye.com/blog/1431239