NSUrl未在NSUserDefault中存储为绝对字符串 [英] NSUrl is not stored as absolutestring in NSUserDefault

问题描述

我指的是以前的帖子，用于存储iPod Library的NSURL在NSUserDefault中.但是在关闭应用程序后，它不会存储在NSUserDefault中.

I am referring Previous Post for storing NSURL of iPod Library in NSUserDefault. But it is not stored in NSUserDefault after application is closed.

我正在使用其他NSStrings存储在NSUserDefaults中，这是完美的做法，但是当我将NSUrl存储为绝对字符串..它不存储值.

I am using other NSStrings to store in NSUserDefaults which is perfectly done, But when i store NSUrl as absolute string.. it does not stores the value.

可能是什么原因?

编辑

以下我用来保存NSUserDefault值的代码:

Following code i am using to save NSUserDefault Value:

currentItem = [collection.items objectAtIndex:songCount];
songURL = [currentItem valueForProperty:MPMediaItemPropertyAssetURL];
[[NSUserDefaults standardUserDefaults] setObject:[currentItem valueForProperty:MPMediaItemPropertyTitle] forKey:@"songTitle"];
[[NSUserDefaults standardUserDefaults] setObject:[songURL absoluteString] forKey:@"songURL"];
avPlayer = [[AVPlayer alloc] initWithURL:songURL];
NSLog(@"songTitle: %@  songURL : %@",[[NSUserDefaults standardUserDefaults]objectForKey:@"songTitle"], songURL);

当我尝试保存NSURL时出现以下错误:

Following error comes when i try to save the NSURL:

2011-09-13 18:47:23.258 Tabata Timer[933:707] songURL : ipod-library://item/item.mp3?id=-3715406019015217536
2011-09-13 18:47:23.258 Tabata Timer[933:707] *** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value 'ipod-library://item/item.mp3?id=-3715406019015217536' of class 'NSURL'.
2011-09-13 18:47:23.260 Tabata Timer[933:707] songTitle : Ghajini
2011-09-13 18:47:24.860 Tabata Timer[933:707] *** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value 'ipod-library://item/item.mp3?id=-3715406019015217536' of class 'NSURL'.
2011-09-13 18:47:24.963 Tabata Timer[933:707] songURL : ipod-library://item/item.mp3?id=-3715406019015217536
warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 (8L1)/Symbols/Developer/usr/lib/libXcodeDebuggerSupport.dylib (file not found).

推荐答案

如果要存储NSURL，为什么要将其转换为字符串并将其另存为字符串.这会增加您的工作量.

If you want to store NSURL then why are you converting it into string and saving it as string. It will increase your work effort.

您可以尝试以下操作:

NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];     
[defaults setURL:[NSURL URLWithString:@"http://www.google.com"] forKey:@"urlValue"];
[defaults synchronize];

NSURL *url=[defaults URLForKey:@"urlValue"];
NSLog(@"%@",url);

这篇关于NSUrl未在NSUserDefault中存储为绝对字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！