ios 使用NSUserDefaults保存自定义对象

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