iOS：粘贴板的读写

#pragma mark 粘贴板 : 写入系统粘贴板
-(NSString *)writeToPasteBoard:(NSString *)content{
   
   UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
   [pasteboard setString:content];
   return 0;
}

#pragma mark 粘贴板 : 读取系统粘贴板
-(NSString *)readFromPasteBoard{
   
   NSString *content = [[UIPasteboard generalPasteboard] string];
   return content;
}