NSObject无法转换string

我有下面的代码，但我得到错误的转换错误，仍然在学习下面的代码试图做什么，所以不知道代码是什么意思。

let padding = 353 let minHeightText: NSString = "\n\n" let font = UIFont(name: "Avenir Light", size: 15.0)! let attributes = [NSFontAttributeName: font] as NSDictionary let item = items[indexPath.row] let minSize = minHeightText.boundingRectWithSize(CGSize(width: (view.frame.size.width - 40), height: 1000), options: .UsesLineFragmentOrigin, attributes: attributes as [NSObject : AnyObject] as [NSObject : AnyObject], context: nil).height let maxSize = item.itemDesctiption.boundingRectWithSize(CGSize(width: (view.frame.size.width - 40), height: 1000), options: .UsesLineFragmentOrigin, attributes: attributes as [NSObject : AnyObject] as [NSObject : AnyObject], context: nil).height + 50 

我得到的错误是这个..

 /Users/David/Desktop/iOS_app/Bid-Hub-app/iOS-app/BidHub-iOS-master/AuctionApp/ItemList/ItemListViewController.swift:140:215: Cannot convert value of type '[NSObject : AnyObject]' to expected argument type '[String : AnyObject]?' /Users/David/Desktop/iOS_app/Bid-Hub-app/iOS-app/BidHub-iOS-master/AuctionApp/ItemList/ItemListViewController.swift:138:208: Cannot convert value of type '[NSObject : AnyObject]' to expected argument type '[String : AnyObject]?' 

Answer 1

不需要将attributes强制转换为NSDictionary 。 进行以下更改：

 let attributes = [NSFontAttributeName: font] as NSDictionary 

应该

 let attributes = [NSFontAttributeName: font] 

并移除到[NSObject : AnyObject]