如何从 plist iOS 读取数组
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How to read Array from plist iOS
提问by ram2013
I am trying to read plist which contains array
我正在尝试读取包含数组的 plist
<?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">
<dict>
<key>key1</key>
<string>value1</string>
<key>key2</key>
<string>value2</string>
<key>keyarray1</key>
<array>
<string>keyitem1</string>
<string>keyitem2</string>
</array>
</dict>
</plist>
when i try to read valueForKey:@"keyarray1", I get null value. I tried to read as a string and array nut no use.
当我尝试读取 valueForKey:@"keyarray1" 时，我得到空值。我试图读取一个字符串和数组 nut 没有用。
My Code
我的代码
NSDictionary * values=[[NSDictionary alloc] initWithContentsOfFile:@"values.plist"];
NSArray *arrayValues=[[NSArray alloc] initWithArray:[values valueForKey:@"keyarray1"]];
回答by rptwsthi
First of all Check your plist looks like:
首先检查你的 plist 看起来像：
Now write following lines where you are accessing your plist
现在在您访问 plist 的地方写下以下几行
Objective-C:
目标-C：
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Values" ofType:@"plist"]];
NSArray *array = [dictionary objectForKey:@"keyarray1"];
NSLog(@"dictionary = %@ \narray = %@", dictionary, array);
Here is the complete screen shot (with log output) of my work window:
这是我的工作窗口的完整屏幕截图（带有日志输出）：
Swift:
迅速：
let dictionary = NSDictionary(contentsOfFile: Bundle.main.pathForResource("Values", ofType: "plist")!);
let array = dictionary?["arrayKey"] as! NSArray
print("dictionary=", dictionary, "\narray =", array)
回答by Arnlee Vizcayno
I know this question is too old and I'll just like to add more information for those people encounter this recently.
我知道这个问题太老了，我只想为最近遇到这个问题的人添加更多信息。
In my case I created a plist as Array(plist default is Dictionary with key "Root").
在我的例子中，我创建了一个 plist 作为数组（plist 默认是带有键“Root”的字典）。
then the xml looks like this:
然后 xml 看起来像这样：
On my view controller I initialize directly the Array instead of initializing the Dictionary then get object for key "Root":
在我的视图控制器上，我直接初始化数组而不是初始化字典然后获取键“Root”的对象：
Note:I only wanted to add this info since I only see initializing the Dictionary then get object for keys. Hope it will help you guys.
注意：我只想添加此信息，因为我只看到初始化字典然后获取键的对象。希望它会帮助你们。
回答by zadr
Where is the plist stored? Is it in the app bundle? If so, you probably want to use [[NSBundle mainBundle] pathForResource:@"values" ofType:@"plist"]to get the path, instead of hardcoding @"values.plist".
plist 存储在哪里？它在应用程序包中吗？如果是这样，您可能想使用[[NSBundle mainBundle] pathForResource:@"values" ofType:@"plist"]获取路径，而不是硬编码@"values.plist"。
After you have the path down correctly, you can then get the array from the dictionary without any problems, with something like [values objectForKey:@"keyarray"].
正确找到路径后，您就可以毫无问题地从字典中获取数组，例如 [values objectForKey:@"keyarray"].
Final note: there is a difference between objectForKey:and valueForKey:. You're currently using valueForkey:which is part of NSKeyValueCoding, a protocol that NSDictionary happens to conform to. You should use objectForKey:(or syntactic sugar accessors, i.e. dictionary[@"key"]) instead, as they are the proper ways of accessing a value from a dictionary.
最后说明：objectForKey:和之间有区别valueForKey:。您当前使用的valueForkey:是NSKeyValueCodingNSDictionary 恰好符合的协议的一部分。您应该改用objectForKey:（或语法糖访问器，即dictionary[@"key"]），因为它们是从字典中访问值的正确方法。
回答by Sunil Zalavadiya
Can you try following code?
你可以试试下面的代码吗？
NSString* plistPath = [[NSBundle mainBundle] pathForResource:@"values" ofType:@"plist"];
NSDictionary * values=[[NSDictionary alloc] initWithContentsOfFile:plistPath];
NSArray *arrayValues=[[NSArray alloc] initWithArray:[values valueForKey:@"keyarray1"]];
NSLog(@"arrayValues = %@",arrayValues);
I got following output in log:-
我在日志中得到以下输出：-
arrayValues = (
keyitem1,
keyitem2
)
回答by Hyman
Swift 4
斯威夫特 4
As in Swift 4 you can use codable & PropertyListDecoder
与 Swift 4 一样，您可以使用codable 和 PropertyListDecoder
func setData() {
// location of plist file
if let settingsURL = Bundle.main.path(forResource: "JsonPlist", ofType: "plist") {
do {
var settings: MySettings?
let data = try Data(contentsOf: URL(fileURLWithPath: settingsURL))
let decoder = PropertyListDecoder()
settings = try decoder.decode(MySettings.self, from: data)
print("array is \(settings?.keyarray1 ?? [""])")//prints ["keyitem1", "keyitem2"]
} catch {
print(error)
}
}
}
}
struct MySettings: Codable {
var keyarray1: [String]?
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
keyarray1 = try values.decodeIfPresent([String].self, forKey: .keyarray1)
}
}
For more see this How to read from a plist with Swift 3 iOS app
有关更多信息，请参阅如何使用 Swift 3 iOS 应用程序读取 plist
回答by Ravindhiran
Try this
尝试这个
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:@"values.plist"];
NSMutableDictionary *dict =[NSMutableDictionary dictionaryWithContentsOfFile:finalPath];
NSArray *arr =[dict valueForKey:@"keyarray1"];
NSLog(@"%@",arr);
