Swift初始化字典数组

Question

我有一个字典数组plist，我试图初始化一个数组，然后我可以访问数组中的每个字典，但不知道如何。

在Objective-C我通常用NSArray *array = [plist objectForKey:@"Root"];然后用NSDictionary *dictionary = [array objectAtIndex:i];然后NSString *string = [dictionary valueForKey@"title"];

这就是我想要实现但与阵列可以在所有的函数中使用全局变量。

Answer 1

根据你的财产清单文件，你可以使用这个

// check the URL (URL related API is recommended) 
if let tipsURL = NSBundle.mainBundle().URLForResource("Tips", withExtension:"plist") { 
    // read the property list file and cast the type to native Swift 'Dictionary' 
    let tipsPlist = NSDictionary(contentsOfURL: tipsURL) as! [String:AnyObject] 
    // get the array for key 'Category 1', 
    // casting the result to '[[String:String]]` avoids further type casting 
    let categoryArray = tipsPlist["Category 1"] as! [[String:String]] 
    // iterate thru the expected array and print all values for 'Title' and 'Tip' 
    for category in categoryArray { 
    print(category["Title"]!) 
    print(category["Tip"]!) 
    } 
} else { 
    // if the plist file does not exist, give up 
    fatalError("Property list file Tips.plist does not exist") 
} 

或考虑在根对象

if let tipsURL = NSBundle.mainBundle().URLForResource("Tips", withExtension:"plist") { 
    let tipsPlist = NSDictionary(contentsOfURL: tipsURL) as! [String:AnyObject] 
    for (_, categoryArray) in tipsPlist { 
    for category in categoryArray as! [[String:String]] { 
     print(category["Title"]!) 
     print(category["Tip"]!) 
    } 
    } 
} else { 
    fatalError("Property list file Tips.plist does not exist") 
} 

Answer 2

var aDict: NSDictionary? 
if let path = NSBundle.mainBundle().pathForResource("file", ofType: "plist") { 
    aDict = NSDictionary(contentsOfFile: path) 
} 

if let aDict = aDict { 
    let str = aDict["title"] 
    print(str) // prints "I am a title." 
} 

要的.plist文件如

<?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>title</key> 
    <string>I am a title.</string> 
</dict> 
</plist> 

PS：Global variables are bad。