objectivec-如何将自定义对象保存到包含UIImage和NSMutableArray的NSUserDefault

Question

在我的项目中，我需要保存一个自定义对象（Person），它有UIImage、NSMutableArray和NSString对象。目前，我能够对NSString对象进行编码和解码，并将Person归档到NSUserDefault中。除了UIImage和NSArray之外，一切都很好。

-(instancetype)initWithCoder:(NSCoder *)aDecoder
{
  if (self = [super init]) {
    self.userName = [aDecoder decodeObjectForKey:@"userName"]; //NSString
    self.profileImage = [aDecoder decodeObjectForKey:@"profileImage"]; //UIImage
    self.uplodedVideoArray = [aDecoder decodeObjectForKey:@"uplodedVideoArray"]; //NSMutableArray
  }
 return self;
}
-(void)encodeWithCoder:(NSCoder *)aCoder
{
 [aCoder encodeObject:self.userName forKey:@"userName"]; //NSString
 [aCoder encodeObject:self.profileImage forKey:@"profileImage"]; //UIImage
 [aCoder encodeObject:self.uplodedVideoArray forKey:@"uplodedVideoArray"]; //NSMutableArray
}
-(void)archivePerson
{
 NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:[Person sharedInstance]];
 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 [defaults setObject:encodedObject forKey:@"Person"];
 [defaults synchronize];
}
-(Person *)unarchivePerson
{
 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 NSData *encodedObject = [defaults objectForKey:@"Person"];
 Person *person = [NSKeyedUnarchiver unarchiveObjectWithData:encodedObject];
 return person;
}    

Answer 1

您只能将某些类型的对象存储到NSUserDefaults，这些类型可以写入plist文件。（请参见此处https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/PropertyLists/AboutPropertyLists/AboutPropertyLists.html）所以你不能在那里存储图像。数组出现问题的原因是，如果集合（数组/字典）仅包含与plist兼容的对象，则它们与plist才兼容。最好的方法是分别保存图像/视频文件，然后将URL（作为String/NSString）写入NSUserDefaults。最佳