如何从.plist文件读取数据结构到NSArray [英] How to read data structure from .plist file into NSArray

问题描述

我是使用下列手动创建一个数据结构：

I was creating a data structure manually using the following:

NSDictionary* league1 = [[NSDictionary alloc] initWithObjectsAndKeys: @"Barclays Premier League", @"name",
                 @"Premier League", @"shortname",
                 @"101", @"id", nil];
NSDictionary* league2 = [[NSDictionary alloc] initWithObjectsAndKeys: @"Coca-Cola Championship", @"name",
                 @"Championship", @"shortname",
                 @"102", @"id", nil];
NSDictionary* league3 = [[NSDictionary alloc] initWithObjectsAndKeys: @"Scottish Premier League", @"name",
                 @"SPL", @"shortname",
                 @"201", @"id", nil];
NSDictionary* league4 = [[NSDictionary alloc] initWithObjectsAndKeys: @"Champions League", @"name",
                 @"UCL", @"shortname",
                 @"501", @"id", nil];

contentArray = [[NSArray alloc] initWithObjects:

                [[NSDictionary alloc] initWithObjectsAndKeys: @"English", @"category", [[NSArray alloc] initWithObjects: league1, league2, nil], @"leagues", nil],
                [[NSDictionary alloc] initWithObjectsAndKeys: @"Scottish", @"category", [[NSArray alloc] initWithObjects: league3, nil], @"leagues", nil],
                [[NSDictionary alloc] initWithObjectsAndKeys: @"Tournaments", @"category", [[NSArray alloc] initWithObjects: league4, nil], @"leagues", nil],
                nil];

[league1 release];
[league2 release];
[league3 release];
[league4 release];

但是，我认为如果从文件中读取会更好。所以我创建了具有以下结构的文件leagues.plist：

However, I thought this would be better if it was read from a file. So I created the file leagues.plist which has the following structure:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <array>
        <dict>
            <key>category</key>
            <string>English</string>
            <key>leagues</key>
            <array>
                <dict>
                    <key>name</key>
                    <string>Barclays Premier League</string>
                    <key>shortname</key>
                    <string>Premier League</string>
                    <key>id</key>
                    <string>101</string>
                </dict>
                <dict>
                    <key>name</key>
                    <string>Coca-Cola Championship</string>
                    <key>shortname</key>
                    <string>Championship</string>
                    <key>id</key>
                    <string>102</string>
                </dict>
            </array>
        </dict>
        <dict>
            <key>category</key>
            <string>Scottish</string>
            <key>leagues</key>
            <array>
                <dict>
                    <key>name</key>
                    <string>Scottish Premier League</string>
                    <key>shortname</key>
                    <string>SPL</string>
                    <key>id</key>
                    <string>201</string>
                </dict>
            </array>
        </dict>
        <dict>
            <key>category</key>
            <string>Tournaments</string>
            <key>leagues</key>
            <array>
                <dict>
                    <key>name</key>
                    <string>Champions League</string>
                    <key>shortname</key>
                    <string>UCL</string>
                    <key>id</key>
                    <string>501</string>
                </dict>
            </array>
        </dict>
    </array>
</plist>

如何读取此文件。我尝试过各种方法，但没有什么工作。我甚至不知道我是否正在寻找文件的正确位置。作为参考，我尝试以下方法：

How do I read this file in. I have tried various methods but nothing has worked. I don't even know if I am looking in the right place for the file. For reference I am trying the following methods:

NSString* errorDesc = nil;
NSPropertyListFormat format;
NSString* plistPath = [[NSBundle mainBundle] pathForResource:@"league" ofType:@"plist"];
NSData* plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
contentArray = (NSArray*)[NSPropertyListSerialization
                                     propertyListFromData:plistXML
                                     mutabilityOption:NSPropertyListMutableContainersAndLeaves
                                     format:&format
                                     errorDescription:&errorDesc];

if (!contentArray) {
    NSLog(errorDesc);
    [errorDesc release];
}

或

NSString* plistPath = [[NSBundle mainBundle] pathForResource:@"league" ofType:@"plist"];
contentArray = [NSArray arrayWithContentsOfFile:plistPath];

或

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];

NSString *fooPath = [documentsPath stringByAppendingPathComponent:@"leagues.plist"];
NSLog(fooPath);
contentArray = [NSArray arrayWithContentsOfFile:fooPath];
NSLog(@"%@",contentArray);

这终于让我完全疯了。

This is finally driving me completely insane. Help please!

推荐答案

NSString* plistPath = [[NSBundle mainBundle] pathForResource:@"league" ofType:@"plist"];
contentArray = [NSDictionary dictionaryWithContentsOfFile:plistPath];

这个答案是正确的 - 你确定你的文件在应用程序中吗？您是否将其添加到项目中，并检查其是否已复制到您的应用程序包中？如果没有，可能是文件没有添加到你正在构建的目标，一个很容易犯的错误，特别是如果你有多个目标。

That answer is correct - are you sure that your file is in the app? Did you add it to your project, and check to see if it gets copied into your app bundle? If not, it might be the file was not added to the target you are building, an easy mistake to make especially if you have multiple targets.

这篇关于如何从.plist文件读取数据结构到NSArray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！