objective-c - 請問UIPasteboard在一個類別中儲存資料後如何在另一個類別中讀取資料?

Question

這是在一個類別中儲存資料
UIPasteboard *pasteboard4 = [UIPasteboard pasteboardWithName:@"Pasteboard4" create:YES];

    
    NSDictionary *loginDic = [NSDictionary dictionaryWithObject:@"用户名密码登陆" forKey:@"getKSWay"];
    NSData *loginDictData = [NSKeyedArchiver archivedDataWithRootObject:loginDic];
    [pasteboard4 setData:loginDictData forPasteboardType:@"getKSWay"];
    

然後在另一個類別中讀取
UIPasteboard *pb = [UIPasteboard pasteboardWithName:@"Pasteboard4" create:NO];

        NSDictionary *dict = [NSKeyedUnarchiver unarchiveObjectWithData:[pb dataForPasteboardType:@"getKSWay"]];
        
        NSLog(@"登陆方式：%@",[dict objectForKey:@"getKSWay"]);
        输出是null

Answer 1

首先你要好好理解UIPasteboard的使用。這點可以學習這篇文章
使用剪貼簿UIPasteboard

利用UIPasteboard保存data型資料時，設定pasteboardType為“public.data”，這個字串是蘋果提供的UTI，關於UTI，你可以參考我的文章

詳解蘋果提供的UTI