NSUserDefaults的encodeWithCoder無法識別的選擇發送到實例

Question

我要救NSMutableDictionary到NSUserDefaults然後得到錯誤：

NSUserDefaults encodeWithCoder unrecognized selector sent to instance. Fatal Exception: NSInvalidArgumentException [NSUserDefaults encodeWithCoder:]: unrecognized selector sent to instance 0x17544a080

這裏是我的代碼：

NSUserDefaults *shared2 = [[NSUserDefaults alloc]initWithSuiteName:@"AppGroupName"]; 
NSMutableData *data1 = [[NSMutableData alloc]init]; 
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data1]; 
[archiver encodeObject:shareDic forKey: @"shareDic"]; 
[archiver finishEncoding]; 

if (data1 !=nil) 
{ 
    [shared2 setObject:data1 forKey:@"dicFitnessData"]; 
} 

Answer 1

您需要實現NSCoding協議。

- (void)encodeWithCoder:(NSCoder *)aCoder{ 
     [aCoder encodeObject:self.yourpoperty forKey:@"Your_KEY"]; 
     } 

    - (id)initWithCoder:(NSCoder *)aDecoder{ 
     if(self = [super init]){ 
     self.yourpoperty = [aDecoder decodeObjectForKey:@"Your_KEY"]; 
     } 
     return self; 
     }