用远程.plist覆盖本地.plist文件 [英] Overwrite with remote .plist a local .plist file

问题描述

我的应用程序在启动时加载了本地list.plist文件.

My application loads a local list.plist file at launch.

然后它有一个refreshTable按钮，该按钮可从我的网站中获取.plist文件的远程版本.

Then it has a refreshTable button which fetch a remote version of the .plist file from my website.

App Launch
    local list.plist loads
       user hits refreshList button
          local list.plist is overwritten by remote list.plist
             local list.plist updated until remote list.plist updates again

初始化数据的方法:

    //Remote data 
    list = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://mywebsite.com/list.plist"]];
    NSSortDescriptor *descriptor = [[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)] autorelease];
    sortedList = [[list sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]] retain];

    //Local data
    NSString *localPath = [[NSBundle mainBundle] pathForResource:@"list" ofType:@"plist"];
   localList = [[NSMutableArray alloc] initWithContentsOfFile:localPath];
    NSSortDescriptor *localDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)] autorelease];
    localSortedList = [[localList sortedArrayUsingDescriptors:[NSArray arrayWithObject:localDescriptor]] retain];

这是刷新方法:

- (void) refreshTable:(id)sender

{  
   //Remote .plist 
   list = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://mywebsite.com/list.plist"]];
    NSSortDescriptor *descriptor = [[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)] autorelease];
   sortedList = [[list sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]] retain];
    [self.tableView reloadData];
    //now write remote plist to local plist
}

下载远程plist之后，如何覆盖本地plist?

After i downloaded the remote plist how can i write over the local plist?

我当时想清空包含本地plist的本地数组，并用远程数组填充它，我这样做是这样的:

I was thinking to empty the local array containing the local plist and fill it with the remote array and i did it this way:

我以自己的方式解决了:

I solved in the way i thought:

 //Remote .plist 
    list = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://phillipapps.com/mntlion/list.plist"]];
    NSSortDescriptor *descriptor = [[[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)] autorelease];
    sortedList = [[list sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]] retain];

    NSLog(@"list: %@",list);
    [localList removeAllObjects];
    [localList addObjectsFromArray:list];
    localSortedList = [[localList sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]] retain];
    NSLog(@"locallist: %@",localList);
    [self.tableView reloadData];

它可以工作，但是我如何用list的内容覆盖localList?

It works, but how can i write over localList with the contents of list?

推荐答案

所以…经过一段聊天时间，我们解决了问题.

so … after a view hours in chat we got the problem solved.

- (NSArray*)readPlist
{
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *plistPath = [[documentPaths lastObject] stringByAppendingPathComponent:@"localFile.plist"];

    NSFileManager *fMgr = [NSFileManager defaultManager];
    if (![fMgr fileExistsAtPath:plistPath]) {
        plistPath = [[NSBundle mainBundle] pathForResource:@"template" ofType:@"plist"];
    }
    return [NSArray arrayWithContentsOfFile:plistPath];
}

- (void)writePlist:(NSArray*)arr
{
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *plistPath = [[documentPaths lastObject] stringByAppendingPathComponent:@"localFile.plist"];

    NSFileManager *fMgr = [NSFileManager defaultManager];
    if (![fMgr fileExistsAtPath:plistPath])
        [fMgr removeItemAtPath:plistPath error:nil];

    [arr writeToFile:plistPath atomically:YES];
}

初始化ivar:

self.plistArray = [self readPlist];

，然后从服务器加载新的plist之后，您必须调用以下代码:

and after loading the new plist from the server you have to call this code:

self.plistArray = [NSArray arrayWithContentsOfURL:[NSURL URLWithString:@"http://mywebsite.com/list.plist"]];
[self writePlist:plistArray]; // e.g. for caching
[self.tableView reloadData];

这篇关于用远程.plist覆盖本地.plist文件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！